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SNMP Version 3 Authentication Vulnerabilities



Cisco Security Advisory: SNMP Version 3 Authentication Vulnerabilities
Cisco Security Advisory: SNMP Version 3 Authentication Vulnerabilities



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Cisco Security Advisory: SNMP Version 3 Authentication
Vulnerabilities

Document ID: 107408

Advisory ID: cisco-sa-20080610-snmpv3

http://www.cisco.com/warp/public/707/cisco-sa-20080610-snmpv3.shtml 

Revision 1.0

For Public Release 2008 June 10 1600 UTC (GMT)

- ---------------------------------------------------------------------

Summary
======
Multiple Cisco products contain either of two authentication
vulnerabilities in the Simple Network Management Protocol version 3
(SNMPv3) feature. These vulnerabilities can be exploited when
processing a malformed SNMPv3 message. These vulnerabilities could
allow the disclosure of network information or may enable an attacker
to perform configuration changes to vulnerable devices. The SNMP
server is an optional service that is disabled by default in Cisco
products. Only SNMPv3 is impacted by these vulnerabilities.
Workarounds are available for mitigating the impact of the
vulnerabilities described in this document.

The United States Computer Emergency Response Team (US-CERT) has
assigned Vulnerability Note VU#878044 to these vulnerabilities.

Common Vulnerabilities and Exposures (CVE) identifier CVE-2008-0960
has also been assigned to these vulnerabilities.

This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080610-snmpv3.shtml 

Affected Products
================
Vulnerable Products
+------------------

The following Cisco products are vulnerable.

  * Cisco IOS
  * Cisco IOS-XR
  * Cisco Catalyst Operating System (CatOS)
  * Cisco NX-OS
  * Cisco Application Control Engine (ACE) Module
  * Cisco ACE Appliance
  * Cisco ACE XML Gateway
  * Cisco MDS 9000 Series Multilayer Fabric Switches

Note:  The SNMP server is disabled by default. These vulnerabilities
only impact devices that are configured for SNMPv3.

To determine the version of SNMP configured in Cisco IOS, CatOS and
IOS-XR, log in to the device and issue the show snmp group command.
The security model field indicates the version of SNMP configured.
The output "usm" is the abbreviation for user-based security model
and this indicates SNMPv3 is configured.

    Cisco IOS
    router#show snmp group
    groupname: test                             security model:v3 noauth 
    readview : v1default                        writeview:         
    notifyview:        
    row status: active
    
    Cisco CatOS
    5500-1 (enable) show snmp group
    Security Model: v3
    Security Name: userv3
    Group Name: groupv3
    Storage Type: nonvolatile
    Row Status: active
    
    Cisco IOS-XR
    RP/0/RP0/CPU0:ios#show snmp group
    groupname: test                          security model:usm
    readview : v1default                     writeview: -
    notifyview: v1default
    row status: nonVolatile  
    

IronPort
+-------

IronPort C-Series, X-Series, and M-Series appliances utilize code
covered by this advisory, but are not susceptible to any security
risk. IronPort C-Series, X-Series, and M-Series incorporate the
libraries under the advisory to provide anonymous read-only access to
system health data. There is no risk of escalated authorization
privileges allowing a 3rd party to make any configuration changes to
the IronPort devices. IronPort S-Series and Encryption Appliances are
not affected by this advisory. This announcement has also been posted
on the IronPort Support Portal, available to IronPort customers: 

https://supportportal.ironport.com/irppcnctr/srvcd?u=http://secure-support.soma.ironport.com/announcement&sid=900016 

Products Confirmed Not Vulnerable
+--------------------------------

The following Cisco products are confirmed not vulnerable:

  * Cisco PIX Security Appliances
  * Cisco ASA Security Appliances
  * Cisco Firewall Services Module (FWSM)
  * Cisco Security Monitoring, Analysis, and Response System (MARS)
  * Cisco Network Admission Control (NAC) Appliance
  * CiscoWorks Wireless LAN Solution Engine (WLSE)

No other Cisco products are currently known to be affected by these
vulnerabilities.

Details
======
SNMP defines a standard mechanism for remote management and
monitoring of devices in an Internet Protocol (IP) network.

There are three general types of SNMP operations: "get" requests to
request information, "set" requests that modify the configuration of
a remote device, and "trap" messages that provide a monitoring
function. SNMP requests and traps are transported over User Datagram
Protocol (UDP) and are received at the assigned destination port
numbers 161 and 162, respectively.

SNMPv3 provides secure access to devices by authenticating and
encrypting packets over the network. RFC2574 defines
the use of HMAC-MD5-96 and HMAC-SHA-96 as the possible authentication
protocols for SNMPv3.

Vulnerabilities have been identified in the authentication code of
multiple SNMPv3 implementations. This advisory identifies two
vulnerabilities that are almost identical. Both are specifically
related to malformed SNMPv3 packets that manipulate the Hash Message
Authentication Code (HMAC). The two vulnerabilities may impact both
Secure Hashing Algorithm-1 (SHA-1) and Message-Digest Algorithm 5
(MD5). The vulnerabilities described in this document can be
successfully exploited using spoofed SNMPv3 packets.

These vulnerabilities are documented in the following Cisco Bug IDs:

  * CSCsf04754 - IOS SNMPv3 HMAC Authentication issue 
  * CSCsf30109 - IOS-XR SNMPv3 HMAC Authentication issue 
  * CSCsf29976 - CatOS SNMPv3 HMAC Authentication issue 
  * CSCsq62662 - ACE XML Gw SNMPv3 HMAC Authentication issue
  * CSCsq60664 - ACE Appliance SNMPv3 HMAC Authentication issue
  * CSCsq60695 - ACE Module SNMPv3 HMAC Authentication issue
  * CSCsq60582 - Nexus SNMPv3 HMAC Authentication issue

Note:  Although multiple software defects are listed, this advisory
only identifies two vulnerabilities. Because different Cisco products
require their own fixes, additional Bug IDs have been assigned.

Vulnerability Scoring Details
============================
Cisco has provided scores for the vulnerabilities in this advisory
based on the Common Vulnerability Scoring System (CVSS). The CVSS
scoring in this Security Advisory is done in accordance with CVSS
version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then
compute environmental scores to assist in determining the impact of
the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding
CVSS at

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html 

Cisco has also provided a CVSS calculator to help compute the
environmental impact for individual networks at

http://intellishield.cisco.com/security/alertmanager/cvss 

CSCsf04754 - IOS SNMPv3 HMAC Authentication issue
- -----------------------------------------------------

CVSS Base Score - 10

	Access Vector		 - Network
	Access Complexity	 - Low
	Authentication		 - None
	Confidentiality Impact	 - Complete
	Integrity Impact	 - Complete
	Availability Impact	 - Complete

CVSS Temporal Score - 8.3

	Exploitability		 - Functional
	Remediation Level	 - Official-Fix
	Report Confidence	 - Confirmed



CSCsf30109 - IOS-XR SNMPv3 HMAC Authentication issue
- --------------------------------------------------------

CVSS Base Score - 10

	Access Vector		 - Network
	Access Complexity	 - Low
	Authentication		 - None
	Confidentiality Impact	 - Complete
	Integrity Impact	 - Complete
	Availability Impact	 - Complete

CVSS Temporal Score - 8.3

	Exploitability		 - Functional
	Remediation Level	 - Official-Fix
	Report Confidence	 - Confirmed



CSCsf29976 - CatOS SNMPv3 HMAC Authentication issue
- -------------------------------------------------------

CVSS Base Score - 10

	Access Vector		 - Network
	Access Complexity	 - Low
	Authentication		 - None
	Confidentiality Impact	 - Complete
	Integrity Impact	 - Complete
	Availability Impact	 - Complete

CVSS Temporal Score - 8.3

	Exploitability		 - Functional
	Remediation Level	 - Official-Fix
	Report Confidence	 - Confirmed



CSCsq62662 - ACE XML Gw SNMPv3 HMAC Authentication issue
- ------------------------------------------------------------

CVSS Base Score - 9.3

	Access Vector		 - Network
	Access Complexity	 - Medium
	Authentication		 - None
	Confidentiality Impact	 - Complete
	Integrity Impact	 - Complete
	Availability Impact	 - Complete

CVSS Temporal Score - 7.7

	Exploitability		 - Functional
	Remediation Level	 - Official-Fix
	Report Confidence	 - Confirmed



CSCsq60664 - ACE Appliance SNMPv3 HMAC Authentication issue
- ---------------------------------------------------------------

CVSS Base Score - 9.3

	Access Vector		 - Network
	Access Complexity	 - Medium
	Authentication		 - None
	Confidentiality Impact	 - Complete
	Integrity Impact	 - Complete
	Availability Impact	 - Complete

CVSS Temporal Score - 8.4

	Exploitability		 - Functional
	Remediation Level	 - Workaround
	Report Confidence	 - Confirmed



CSCsq60695 - ACE Module SNMPv3 HMAC Authentication issue
- ------------------------------------------------------------

CVSS Base Score - 9.3

	Access Vector		 - Network
	Access Complexity	 - Medium
	Authentication		 - None
	Confidentiality Impact	 - Complete
	Integrity Impact	 - Complete
	Availability Impact	 - Complete

CVSS Temporal Score - 8.4

	Exploitability		 - Functional
	Remediation Level	 - Workaround
	Report Confidence	 - Confirmed



CSCsq60582 - Nexus SNMPv3 HMAC Authentication issue
- -------------------------------------------------------

CVSS Base Score - 9.3

	Access Vector		 - Network
	Access Complexity	 - Medium
	Authentication		 - None
	Confidentiality Impact	 - Complete
	Integrity Impact	 - Complete
	Availability Impact	 - Complete

CVSS Temporal Score - 8.4

	Exploitability		 - Functional
	Remediation Level	 - Workaround
	Report Confidence	 - Confirmed


Impact
=====
Successful exploitation of these vulnerabilities could result in the
disclosure of sensitive information on a device or allow an attacker
to make configuration changes to a vulnerable device that is based on
the SNMP configuration.

Software Versions and Fixes
==========================
When considering software upgrades, also consult
http://www.cisco.com/go/psirt and any subsequent advisories to 
determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the
devices to be upgraded contain sufficient memory and that current
hardware and software configurations will continue to be supported
properly by the new release. If the information is not clear, contact
the Cisco Technical Assistance Center (TAC) or your contracted
maintenance provider for assistance.

Each row of the Cisco IOS software table (below) names a Cisco IOS
release train. If a given release train is vulnerable, then the
earliest possible releases that contain the fix (along with the
anticipated date of availability for each, if applicable) are listed
in the "First Fixed Release" column of the table. The "Recommended
Release" column indicates the releases which have fixes for all the
published vulnerabilities at the time of this Advisory. A device
running a release in the given train that is earlier than the release
in a specific column (less than the First Fixed Release) is known to
be vulnerable. Cisco recommends upgrading to a release equal to or
later than the release in the "Recommended Releases" column of the
table.

+----------------------------------------+
|   Major    | Availability of Repaired  |
|  Release   |         Releases          |
|------------+---------------------------|
|  Affected  | First Fixed | Recommended |
| 12.0-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
| 12.0       | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0DA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0DB     | 12.0(2)DB   | 12.4(18b)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0DC     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | 12.0(28)S1  |             |
|            |             |             |
| 12.0S      | 12.0(32)S5  |             |
|            |             |             |
|            | 12.0(33)S   |             |
|------------+-------------+-------------|
| 12.0SC     | 12.0(7)SC   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0SL     | first fixed |             |
|            | in 12.0S    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0SP     | first fixed |             |
|            | in 12.0S    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0ST     | first fixed |             |
|            | in 12.0S    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0SX     | first fixed |             |
|            | in 12.0S    |             |
|------------+-------------+-------------|
| 12.0SY     | 12.0(32)SY1 |             |
|------------+-------------+-------------|
| 12.0SZ     | 12.0(30)SZ4 |             |
|------------+-------------+-------------|
| 12.0T      | 12.0(1)T    | 12.4(18b)   |
|------------+-------------+-------------|
| 12.0W      | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0WC     | 12.0(5)WC16 |             |
|------------+-------------+-------------|
| 12.0WT     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XC     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XD     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XE     | 12.0(1)XE   |             |
|------------+-------------+-------------|
| 12.0XF     | 12.0(2)XF1  | 12.0(2)XF   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XG     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XH     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Releases    |             |
|            | prior to    |             |
|            | 12.0(4)XI2  |             |
|            | are         |             |
|            | vulnerable, |             |
| 12.0XI     | release     | 12.4(18b)   |
|            | 12.0(4)XI2  |             |
|            | and later   |             |
|            | are not     |             |
|            | vulnerable; |             |
|            | first fixed |             |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XJ     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XK     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XL     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XM     | first fixed | 12.4(18b)   |
|            | in 12.0T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XN     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XQ     | first fixed | 12.4(18b)   |
|            | in 12.0T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XR     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XS     | first fixed |             |
|            | in 12.1E    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0XV     | first fixed | 12.4(18b)   |
|            | in 12.0T    |             |
|------------+-------------+-------------|
| 12.0XW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|  Affected  | First Fixed | Recommended |
| 12.1-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1       | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1AA     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1AX     | first fixed |             |
|            | in 12.2EY   |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.1(22)    |
| 12.1AY     | first fixed | EA11        |
|            | in 12.1EA   |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.1(22)    |
| 12.1AZ     | first fixed | EA11        |
|            | in 12.1EA   |             |
|------------+-------------+-------------|
|            | Releases    |             |
|            | prior to    |             |
|            | 12.1(7)CX   |             |
|            | are         |             |
|            | vulnerable, |             |
| 12.1CX     | release     | 12.4(18b)   |
|            | 12.1(7)CX   |             |
|            | and later   |             |
|            | are not     |             |
|            | vulnerable; |             |
|            | first fixed |             |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1DA     | first fixed |             |
|            | in 12.2DA   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1DB     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1DC     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
| 12.1E      | 12.1(1)E2   |             |
|------------+-------------+-------------|
| 12.1EA     | 12.1(22)    | 12.1(22)    |
|            | EA10        | EA11        |
|------------+-------------+-------------|
| 12.1EB     | Vulnerable; |             |
|            | contact TAC |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1EC     | first fixed |             |
|            | in 12.3BC   |             |
|------------+-------------+-------------|
|            |             | 12.2(29)    |
|            |             | SVD1;       |
| 12.1EO     | 12.1(19)EO6 | Available   |
|            |             | on          |
|            |             | 13-JUN-2008 |
|------------+-------------+-------------|
|            |             | 12.2(25)    |
|            |             | EWA14       |
|            | Vulnerable; |             |
| 12.1EU     | first fixed | 12.2(31)    |
|            | in 12.2SG   | SGA7        |
|            |             |             |
|            |             | 12.2(44)SG  |
|------------+-------------+-------------|
|            |             | 12.2(29)    |
|            | Vulnerable; | SVD1;       |
| 12.1EV     | first fixed | Available   |
|            | in 12.2SV   | on          |
|            |             | 13-JUN-2008 |
|------------+-------------+-------------|
|            |             | 12.2(25)    |
|            |             | EWA14       |
|            | Vulnerable; |             |
| 12.1EW     | first fixed | 12.2(31)    |
|            | in 12.2EW   | SGA7        |
|            |             |             |
|            |             | 12.2(44)SG  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1EX     | first fixed |             |
|            | in 12.1E    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1EY     | first fixed |             |
|            | in 12.1E    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1EZ     | first fixed |             |
|            | in 12.1E    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1GA     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1GB     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1T      | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XA     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XB     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XC     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XD     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XE     | first fixed |             |
|            | in 12.1E    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XF     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XG     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XH     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XI     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XJ     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.1XK     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XL     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XM     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.1XN     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.1XO     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XP     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XQ     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XR     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XS     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XT     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XU     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XV     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XW     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XX     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XY     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1XZ     | first fixed | 12.4(18b)   |
|            | in 12.2     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YA     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YB     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YC     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YD     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Releases    |             |
|            | prior to    |             |
|            | 12.1(5)YE6  |             |
|            | are         |             |
|            | vulnerable, |             |
| 12.1YE     | release     | 12.4(18b)   |
|            | 12.1(5)YE6  |             |
|            | and later   |             |
|            | are not     |             |
|            | vulnerable; |             |
|            | first fixed |             |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YF     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.1YG     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YH     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.1YI     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.1(22)    |
| 12.1YJ     | first fixed | EA11        |
|            | in 12.1EA   |             |
|------------+-------------+-------------|
|  Affected  | First Fixed | Recommended |
| 12.2-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
|            | 12.2(26c)   |             |
|            |             |             |
|            | 12.2(27c)   |             |
|            |             |             |
| 12.2       | 12.2(28d)   | 12.4(18b)   |
|            |             |             |
|            | 12.2(29b)   |             |
|            |             |             |
|            | 12.2(40)    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2B      | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2BC     | first fixed |             |
|            | in 12.3BC   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2BW     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2BY     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2BZ     | first fixed |             |
|            | in 12.3XI   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2CX     | first fixed |             |
|            | in 12.3BC   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2CY     | first fixed |             |
|            | in 12.3BC   |             |
|------------+-------------+-------------|
| 12.2CZ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | 12.2(10)DA4 |             |
| 12.2DA     |             |             |
|            | 12.2(12)    |             |
|            | DA11        |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2DD     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2DX     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            |             | 12.2(25)    |
|            |             | EWA14       |
|            | Vulnerable; |             |
| 12.2EU     | first fixed | 12.2(31)    |
|            | in 12.2SG   | SGA7        |
|            |             |             |
|            |             | 12.2(44)SG  |
|------------+-------------+-------------|
|            |             | 12.2(25)    |
|            |             | EWA14       |
|            | 12.2(18)EW7 |             |
| 12.2EW     |             | 12.2(31)    |
|            | 12.2(20)EW4 | SGA7        |
|            |             |             |
|            |             | 12.2(44)SG  |
|------------+-------------+-------------|
|            | 12.2(20)    |             |
|            | EWA3        |             |
|            |             |             |
|            | 12.2(25)    |             |
|            | EWA11       | 12.2(25)    |
| 12.2EWA    |             | EWA14       |
|            | 12.2(25)    |             |
|            | EWA7        |             |
|            |             |             |
|            | 12.2(25)    |             |
|            | EWA8        |             |
|------------+-------------+-------------|
|            |             | 12.2(44)EX; |
| 12.2EX     | 12.2(35)EX  | Available   |
|            |             | on          |
|            |             | 26-JUN-2008 |
|------------+-------------+-------------|
| 12.2EY     | 12.2(37)EY  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2EZ     | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2FX     | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2FY     | first fixed |             |
|            | in 12.2SEG  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2FZ     | first fixed | 12.2(44)SE2 |
|            | in 12.2SE   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2IXA    | migrate to  |             |
|            | any release |             |
|            | in 12.2IXD  |             |
|------------+-------------+-------------|
| 12.2IXB    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2IXC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2IXD    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2IXE    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2IXF    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2JA     | first fixed |             |
|            | in 12.3JA   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2JK     | first fixed | 12.4(15)T5  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2MB     | first fixed |             |
|            | in 12.2SW   |             |
|------------+-------------+-------------|
| 12.2MC     | 12.2(15)    | 12.4(18b)   |
|            | MC2h        |             |
|------------+-------------+-------------|
|            | 12.2(14)S18 |             |
|            |             | 12.2(31)    |
|            | 12.2(18)S13 | SB12        |
| 12.2S      |             |             |
|            | 12.2(20)S13 | 12.2(33)    |
|            |             | SRC1        |
|            | 12.2(25)S11 |             |
|------------+-------------+-------------|
|            | 12.2(28)SB4 |             |
|            |             |             |
| 12.2SB     | 12.2(31)SB2 | 12.2(31)    |
|            |             | SB12        |
|            | 12.2(31)    |             |
|            | SB3x        |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.2(31)    |
| 12.2SBC    | first fixed | SB12        |
|            | in 12.2SB   |             |
|------------+-------------+-------------|
| 12.2SCA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SE     | 12.2(35)SE  | 12.2(44)SE2 |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SEA    | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SEB    | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SEC    | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SED    | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
| 12.2SEE    | 12.2(25)    |             |
|            | SEE3        |             |
|------------+-------------+-------------|
| 12.2SEF    | 12.2(25)    | 12.2(44)SE2 |
|            | SEF2        |             |
|------------+-------------+-------------|
| 12.2SEG    | 12.2(25)    |             |
|            | SEG2        |             |
|------------+-------------+-------------|
|            | 12.2(25)SG1 |             |
|            |             |             |
|            | 12.2(31)SG1 |             |
| 12.2SG     |             | 12.2(44)SG  |
|            | 12.2(31)SG2 |             |
|            |             |             |
|            | 12.2(37)SG  |             |
|------------+-------------+-------------|
| 12.2SGA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SM     | 12.2(29)SM2 | 12.2(29)SM3 |
|------------+-------------+-------------|
|            |             | 12.2(29)    |
|            |             | SVD1;       |
| 12.2SO     | 12.2(18)SO7 | Available   |
|            |             | on          |
|            |             | 13-JUN-2008 |
|------------+-------------+-------------|
| 12.2SRA    | 12.2(33)    |             |
|            | SRA1        |             |
|------------+-------------+-------------|
| 12.2SRB    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SRC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SU     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | 12.2(27)SV5 |             |
|            |             |             |
|            | 12.2(28)SV1 | 12.2(29)    |
|            |             | SVD1;       |
| 12.2SV     | 12.2(29)SV3 | Available   |
|            |             | on          |
|            | 12.2(29a)   | 13-JUN-2008 |
|            | SV1         |             |
|            |             |             |
|            | 12.2(29b)SV |             |
|------------+-------------+-------------|
| 12.2SVA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SVC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SVD    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SW     | 12.2(25)SW8 |             |
|------------+-------------+-------------|
|            |             | 12.2(18)    |
|            | Vulnerable; | SXF15;      |
| 12.2SX     | first fixed | Available   |
|            | in 12.2SXF  | on          |
|            |             | 08-AUG-2008 |
|------------+-------------+-------------|
|            |             | 12.2(18)    |
|            | Vulnerable; | SXF15;      |
| 12.2SXA    | first fixed | Available   |
|            | in 12.2SXF  | on          |
|            |             | 08-AUG-2008 |
|------------+-------------+-------------|
|            |             | 12.2(18)    |
|            | Vulnerable; | SXF15;      |
| 12.2SXB    | first fixed | Available   |
|            | in 12.2SXF  | on          |
|            |             | 08-AUG-2008 |
|------------+-------------+-------------|
|            |             | 12.2(18)    |
|            | 12.2(18)    | SXF15;      |
| 12.2SXD    | SXD7a       | Available   |
|            |             | on          |
|            |             | 08-AUG-2008 |
|------------+-------------+-------------|
|            |             | 12.2(18)    |
|            | 12.2(18)    | SXF15;      |
| 12.2SXE    | SXE6a       | Available   |
|            |             | on          |
|            |             | 08-AUG-2008 |
|------------+-------------+-------------|
|            | 12.2(18)    |             |
|            | SXF10a      | 12.2(18)    |
|            |             | SXF15;      |
| 12.2SXF    | 12.2(18)    | Available   |
|            | SXF12a      | on          |
|            |             | 08-AUG-2008 |
|            | 12.2(18)    |             |
|            | SXF6        |             |
|------------+-------------+-------------|
| 12.2SXH    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            |             | 12.2(31)    |
|            | Vulnerable; | SB12        |
| 12.2SZ     | first fixed |             |
|            | in 12.2S    | 12.2(33)    |
|            |             | SRC1        |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2T      | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.2TPC    | 12.2(8)     |             |
|            | TPC10b      |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.2(31)    |
| 12.2UZ     | first fixed | SB12        |
|            | in 12.2SB   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XA     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XB     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XC     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XD     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XE     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XF     | first fixed |             |
|            | in 12.3BC   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XG     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XH     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XI     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XJ     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XK     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XL     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XM     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.2XN     | 12.2(33)XN1 | 12.4(18b)   |
|------------+-------------+-------------|
| 12.2XNA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2XO     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XQ     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XR     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XS     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XT     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XU     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XV     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2XW     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.2YA     | 12.2(4)YA12 | 12.4(18b)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YB     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YC     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YD     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
| 12.2YE     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YF     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YG     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YH     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YJ     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YK     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YL     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YM     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YN     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.2(18)    |
|            | migrate to  | SXF15;      |
| 12.2YO     | any release | Available   |
|            | in 12.2SY   | on          |
|            |             | 08-AUG-2008 |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YP     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YQ     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YR     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YS     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YT     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YU     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YV     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YW     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
| 12.2YX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YY     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            |             | 12.2(31)    |
|            | Vulnerable; | SB12        |
| 12.2YZ     | first fixed |             |
|            | in 12.2S    | 12.2(33)    |
|            |             | SRC1        |
|------------+-------------+-------------|
|            |             | 12.2(18)    |
|            | Vulnerable; | SXF15;      |
| 12.2ZA     | first fixed | Available   |
|            | in 12.2SXF  | on          |
|            |             | 08-AUG-2008 |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZB     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZC     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
| 12.2ZD     | Vulnerable; |             |
|            | contact TAC |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZE     | first fixed | 12.4(18b)   |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZF     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            |             | 12.3(2)XA7  |
|            | Vulnerable; |             |
| 12.2ZG     | first fixed | 12.4(15)T5  |
|            | in 12.3YG   |             |
|            |             | 12.4(18b)   |
|------------+-------------+-------------|
| 12.2ZH     | 12.2(13)ZH9 | 12.2(13)    |
|            |             | ZH11        |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZJ     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.4(15)T5  |
| 12.2ZL     | first fixed |             |
|            | in 12.3T    | 12.4(18b)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZP     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            |             | 12.2(33)    |
|            |             | SXH3;       |
| 12.2ZU     | 12.2(18)ZU1 | Available   |
|            |             | on          |
|            |             | 03-JUL-2008 |
|------------+-------------+-------------|
| 12.2ZY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|  Affected  | First Fixed | Recommended |
| 12.3-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
|            | 12.3(17c)   |             |
|            |             |             |
|            | 12.3(18a)   |             |
|            |             |             |
| 12.3       | 12.3(19a)   | 12.4(18b)   |
|            |             |             |
|            | 12.3(20a)   |             |
|            |             |             |
|            | 12.3(21)    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3B      | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | 12.3(17b)   |             |
| 12.3BC     | BC3         |             |
|            |             |             |
|            | 12.3(21)BC  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3BW     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
| 12.3EU     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | 12.3(11)JA  |             |
|            |             |             |
|            | 12.3(7)JA5  |             |
| 12.3JA     |             |             |
|            | 12.3(8)JA3; |             |
|            | Available   |             |
|            | on          |             |
|            | 18-SEP-2008 |             |
|------------+-------------+-------------|
| 12.3JEA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.3JEB    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.3JEC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            |             | 12.3(2)JK4; |
|            |             | Available   |
|            |             | on          |
|            | 12.3(2)JK2  | 30-JUN-2008 |
| 12.3JK     |             |             |
|            | 12.3(8)JK1  | 12.3(8)JK2; |
|            |             | Available   |
|            |             | on          |
|            |             | 30-JUN-2008 |
|------------+-------------+-------------|
| 12.3JL     | 12.3(2)JL1  | 12.3(2)JL4  |
|------------+-------------+-------------|
| 12.3JX     | Vulnerable; | 12.3(7)JX11 |
|            | contact TAC |             |
|------------+-------------+-------------|
| 12.3T      | 12.3(11)T11 | 12.4(18b)   |
|------------+-------------+-------------|
| 12.3TPC    | 12.3(4)     |             |
|            | TPC11b      |             |
|------------+-------------+-------------|
| 12.3VA     | Vulnerable; |             |
|            | contact TAC |             |
|------------+-------------+-------------|
| 12.3XA     | 12.3(2)XA6  | 12.3(2)XA7  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XB     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            |             | 12.4(15)T5  |
| 12.3XC     | 12.3(2)XC5  |             |
|            |             | 12.4(18b)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XD     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            |             | 12.4(15)T5  |
| 12.3XE     | 12.3(2)XE5  |             |
|            |             | 12.4(18b)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XF     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.4(15)T5  |
| 12.3XG     | first fixed |             |
|            | in 12.3YG   | 12.4(18b)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XH     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
| 12.3XI     | 12.3(7)XI8a |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.3(14)    |
| 12.3XJ     | first fixed | YX11        |
|            | in 12.3YX   |             |
|            |             | 12.4(15)T5  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XK     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XQ     | first fixed | 12.4(18b)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            |             | 12.4(15)T5  |
| 12.3XR     | 12.3(7)XR7  |             |
|            |             | 12.4(18b)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XS     | first fixed | 12.4(18b)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XU     | first fixed | 12.4(15)T5  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.3(14)    |
| 12.3XW     | first fixed | YX11        |
|            | in 12.3YX   |             |
|            |             | 12.4(15)T5  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XY     | first fixed | 12.4(18b)   |
|            | in 12.3T    |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.4(15)T5  |
| 12.3YA     | first fixed |             |
|            | in 12.4     | 12.4(18b)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YD     | first fixed | 12.4(15)T5  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.3(14)    |
| 12.3YF     | first fixed | YX11        |
|            | in 12.3YX   |             |
|            |             | 12.4(15)T5  |
|------------+-------------+-------------|
| 12.3YG     | 12.3(8)YG6  | 12.4(15)T5  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YH     | first fixed | 12.4(15)T5  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YI     | first fixed | 12.4(15)T5  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YJ     | first fixed | 12.4(15)T5  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
| 12.3YK     | 12.3(11)YK3 | 12.4(15)T5  |
|------------+-------------+-------------|
| 12.3YM     | 12.3(14)YM8 | 12.3(14)    |
|            |             | YM12        |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YQ     | first fixed | 12.4(15)T5  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
| 12.3YS     | 12.3(11)YS2 | 12.4(15)T5  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YT     | first fixed | 12.4(15)T5  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YU     | first fixed |             |
|            | in 12.4XB   |             |
|------------+-------------+-------------|
| 12.3YX     | 12.3(14)YX4 | 12.3(14)    |
|            |             | YX11        |
|------------+-------------+-------------|
| 12.3YZ     | 12.3(11)YZ2 |             |
|------------+-------------+-------------|
|  Affected  | First Fixed | Recommended |
| 12.4-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
|            | 12.4(10)    |             |
|            |             |             |
|            | 12.4(3f)    |             |
|            |             |             |
| 12.4       | 12.4(5c)    | 12.4(18b)   |
|            |             |             |
|            | 12.4(7c)    |             |
|            |             |             |
|            | 12.4(8b)    |             |
|------------+-------------+-------------|
| 12.4JA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4JK     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4JMA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4JMB    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4JMC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4JX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4MD     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4MR     | 12.4(9)MR   |             |
|------------+-------------+-------------|
| 12.4SW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | 12.4(11)T   |             |
|            |             |             |
|            | 12.4(2)T6   |             |
|            |             |             |
| 12.4T      | 12.4(4)T5   | 12.4(15)T5  |
|            |             |             |
|            | 12.4(6)T4   |             |
|            |             |             |
|            | 12.4(9)T1   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.4XA     | first fixed | 12.4(15)T5  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
| 12.4XB     | 12.4(2)XB3  |             |
|------------+-------------+-------------|
| 12.4XC     | 12.4(4)XC5  |             |
|------------+-------------+-------------|
| 12.4XD     | 12.4(4)XD4  | 12.4(15)T5  |
|------------+-------------+-------------|
| 12.4XE     | 12.4(6)XE2  | 12.4(15)T5  |
|------------+-------------+-------------|
| 12.4XF     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XG     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XJ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XK     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XM     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XN     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XQ     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XT     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XV     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XZ     | Not         |             |
|            | Vulnerable  |             |
+----------------------------------------+

Cisco CatOS
+----------

The following table lists fixed Cisco Catalyst Operating System
(CatOS) software.

+---------------------------------------+
|    Affected     | Affected |  First   |
|     Product     | Release  |  Fixed   |
|                 |          | Release  |
|-----------------+----------+----------|
|                 | 6.x      | 6.4(23)  |
|                 |----------+----------|
| Cisco Catalyst  | 7.x      | 7.6(19)  |
|Operating        |----------+----------|
| System (CatOS)  | 8.5.x    | 8.5(7)   |
|                 |----------+----------|
|                 | 8.6.x    | 8.6(1)   |
+---------------------------------------+

Cisco IOS XR
+-----------

The following table lists fixed Cisco IOS XR software.

+---------------------------------------------------+
|  Cisco  |            |                            |
| IOS XR  |   SMU ID   |          SMU Name          |
| Version |            |                            |
|---------+------------+----------------------------|
| 3.2.2   | AA01681    | hfr-base-3.2.2.CSCsf30109  |
|---------+------------+----------------------------|
| 3.2.3   | AA01682    | hfr-base-3.2.3.CSCsf30109  |
|---------+------------+----------------------------|
| 3.2.4   | AA01683    | hfr-base-3.2.4.CSCsf30109  |
|---------+------------+----------------------------|
| 3.2.6   | AA01684    | hfr-base-3.2.6.CSCsf30109  |
|---------+------------+----------------------------|
| 3.3.0   | AA01685    | hfr-base-3.3.0.CSCsf30109  |
|---------+------------+----------------------------|
| 3.3.0   | AA01690    | c12k-base-3.3.0.CSCsf30109 |
|---------+------------+----------------------------|
| 3.3.1   | AA01686    | hfr-base-3.3.1.CSCsf30109  |
|---------+------------+----------------------------|
| 3.3.1   | AA01688    | c12k-base-3.3.1.CSCsf30109 |
|---------+------------+----------------------------|
| 3.3.2   | Not        | Not vulnerable             |
|         | vulnerable |                            |
|---------+------------+----------------------------|
| 3.4.x   | Not        | Not vulnerable             |
|         | vulnerable |                            |
+---------------------------------------------------+

Cisco NX-OS
+----------

The following table lists fixed Cisco NX-OS software.

+----------------------------------------+
| Affected  | Affected  |  First Fixed   |
|  Product  |  Release  |    Release     |
|-----------+-----------+----------------|
| Cisco     |           | 4.0.(2)        |
| NX-OS     | 4.0.(1)a  | Available June |
|           |           | 2008           |
+----------------------------------------+

Cisco ACE Products
+-----------------

The following table lists fixed Cisco Application Control Engine
(ACE) software.

+---------------------------------------+
|    Affected    | Affected |   First   |
|    Product     | Release  |   Fixed   |
|                |          |  Release  |
|----------------+----------+-----------|
|                | 3.0(0)A1 |           |
| Cisco          | (6.x)    |           |
| Application    |          | A2(1.1)   |
| Control Engine | A2(1.0)  |           |
| (ACE) Module   |          |           |
|                | A2(1.0a) |           |
|----------------+----------+-----------|
|                | A1(7.0)  |           |
|                |          |           |
| Cisco          | A1(7.0a) |           |
| Application    |          |           |
| Control Engine | A1(7.0b) | A1(8.0a)  |
| (ACE)          |          |           |
| Appliance      | A1(7.0c) |           |
|                |          |           |
|                | A1(8.0)  |           |
|----------------+----------+-----------|
| Cisco          | 4.x      |           |
| Application    |          | 6.0.1     |
| Control Engine | 5.x      | Available |
| (ACE) XML      |          | June 2008 |
| Gateway        | 6.0      |           |
+---------------------------------------+

Cisco MDS software
+-----------------

The following table lists fixed Cisco MDS Multilayer Switch software.

+---------------------------------------+
| Affected  | Affected  |  First Fixed  |
|  Product  |  Release  |    Release    |
|-----------+-----------+---------------|
|           | 2.1       |               |
| Cisco MDS |           | 3.4.1         |
| 9000      | 3.0       | Available     |
|           |           | June 2008     |
|           | 3.2       |               |
+---------------------------------------+

Workarounds
==========
The following workarounds have been identified for these
vulnerabilities.

Infrastructure Access Control Lists
+----------------------------------

Although it is often difficult to block traffic that transits a
network, it is possible to identify traffic that should never be
allowed to target infrastructure devices and block that traffic at
the border of networks. Infrastructure Access Control Lists (iACLs)
are a network security best practice and should be considered as a
long-term addition to good network security as well as a workaround
for these specific vulnerabilities. The iACL example below should be
included as part of the deployed infrastructure access-list which
will protect all devices with IP addresses in the infrastructure IP
address range:

Note:  UDP port 161 is applicable for all versions of SNMP.

    
    !--- Permit SNMP UDP 161 packets from
    !--- trusted hosts destined to infrastructure addresses.
    
    access-list 150 permit udp TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK eq 161
    
    !--- Deny SNMP UDP 161 packets from all
    !--- other sources destined to infrastructure addresses.
    
    access-list 150 deny udp any INFRASTRUCTURE_ADDRESSES MASK eq 161
    
    !--- Permit/deny all other Layer 3 and Layer 4 traffic in accordance
    !--- with existing security policies and configurations
    !--- Permit all other traffic to transit the device.
    
    access-list 150 permit ip any anyinterface serial 2/0ip access-group 150 in
    

The white paper entitled "Protecting Your Core: Infrastructure
Protection Access Control Lists" presents guidelines and recommended
deployment techniques for infrastructure protection access lists.
This white paper can be obtained at the following link:
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml 

Control Plane Policing
+---------------------

Control Plane Policing (CoPP) can be used to block untrusted SNMP
access to the device. Cisco IOS software releases 12.0S, 12.2SX,
12.2S, 12.3T, 12.4, and 12.4T support the CoPP feature. CoPP can be
configured on a device to protect the management and control planes
and minimize the risk and effectiveness of direct infrastructure
attacks by explicitly permitting only authorized traffic that is sent
to infrastructure devices in accordance with existing security
policies and configurations. The following example, which uses
192.168.100.1 to represent a trusted host, can be adapted to your
network.

    
    !--- Deny SNMP UDP traffic from trusted hosts to all IP addresses
    !--- configured on all interfaces of the affected device so that
    
    !--- it will be allowed by the CoPP feature
    
    
    access-list 111 deny udp host 192.168.100.1 any eq 161
    
    
    !--- Permit all other SNMP UDP traffic sent to all IP addresses
    !--- configured on all interfaces of the affected device so that it
    !--- will be policed and dropped by the CoPP feature
    
    
    access-list 111 permit udp any any eq 161
    
    
    !--- Permit (Police or Drop)/Deny (Allow) all other Layer3 and Layer4
    !--- traffic in accordance with existing security policies and
    !--- configurations for traffic that is authorized to be sent
    !--- to infrastructure devices
    
    !--- Create a Class-Map for traffic to be policed by
    !--- the CoPP feature
    
    
    class-map match-all drop-snmpv3-class
    match access-group 111
    
    
    !--- Create a Policy-Map that will be applied to the
    !--- Control-Plane of the device.
    
    
    policy-map drop-snmpv3-traffic
    class drop-snmpv3-class
    drop
    
    
    !--- Apply the Policy-Map to the 
    !--- Control-Plane of the device
    
    
    control-plane
    service-policy input drop-snmpv3-traffic
    

In the above CoPP example, the access control list entries (ACEs)
that match the potential exploit packets with the "permit" action
result in these packets being discarded by the policy-map "drop"
function, while packets that match the "deny" action (not shown) are
not affected by the policy-map drop function.

Please note that the policy-map syntax is different in the 12.2S and
12.0S Cisco IOS trains:

    policy-map drop-snmpv3-traffic
    class drop-snmpv3-class
    police 32000 1500 1500 conform-action drop exceed-action drop
    

Additional information on the configuration and use of the CoPP
feature is available at the following links:

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6642/prod_white_paper0900aecd804fa16a.html 

and 

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html 

Transit Access Control Lists
+---------------------------

Filters that deny SNMP packets using UDP port 161 should be deployed
throughout the network as part of a Transit Access Control List
(tACL) policy for protection of traffic that enters the network at
ingress access points. This policy should be configured to protect
the network device where the filter is applied and other devices
behind it. Filters for SNMP packets that use UDP port 161 should also
be deployed in front of vulnerable network devices so that traffic is
only allowed from trusted clients.

Additional information about tACLs is available in "Transit Access
Control Lists: Filtering at Your Edge:"

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801afc76.shtml 

Hardening Guide Statement
+------------------------

Customers are advised to review the "Fortifying the Simple Network
Management Protocol" section of the "Cisco Guide to Harden Cisco IOS
Devices" for information on configuring an IOS device for SNMPv3
authentication and privacy:

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080120f48.shtml#fortify 

Cisco IOS authPriv Configuration
+-------------------------------

Enabling the SNMPv3 privacy subsystem (if it is not already in use)
is a short-term workaround for users who are unable to upgrade in a
timely fashion. This subsystem is used to encrypt SNMPv3 traffic
using a shared secret.

In Cisco IOS, administrators can enable this workaround by using the 
authPriv SNMPv3 feature. Only Cisco IOS crypto images can run the 
authPriv feature.

Note:  Ensure that the management application supports SNMPv3 
authPriv before implementing this feature.

Applied Mitigation Bulletin
+--------------------------

Additional mitigation techniques that can be deployed on Cisco devices
within the network are available in the Cisco Applied Intelligence
companion document for this advisory:
http://www.cisco.com/warp/public/707/cisco-amb-20080610-SNMPv3.shtml 

Obtaining Fixed Software
=======================
Cisco has released free software updates that address these
vulnerabilities. Prior to deploying software, customers should
consult their maintenance provider or check the software for feature
set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets
they have purchased. By installing, downloading, accessing or
otherwise using such software upgrades, customers agree to be bound by
the terms of Cisco's software license terms found at
http://www.cisco.com/en/US/products/prod_warranties_item09186a008088e31f.html 
or as otherwise set forth at Cisco.com Downloads at
http://www.cisco.com/public/sw-center/sw-usingswc.shtml. 

Do not contact psirt@cisco.com or security-alert@cisco.com for 
software upgrades.

Customers with Service Contracts
+-------------------------------

Customers with contracts should obtain upgraded software through
their regular update channels. For most customers, this means that
upgrades should be obtained through the Software Center on Cisco's
worldwide website at http://www.cisco.com. 

Customers using Third Party Support Organizations
+------------------------------------------------

Customers whose Cisco products are provided or maintained through
prior or existing agreements with third-party support organizations,
such as Cisco Partners, authorized resellers, or service providers
should contact that support organization for guidance and assistance
with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific
customer situations, such as product mix, network topology, traffic
behavior, and organizational mission. Due to the variety of affected
products and releases, customers should consult with their service
provider or support organization to ensure any applied workaround or
fix is the most appropriate for use in the intended network before it
is deployed.

Customers without Service Contracts
+----------------------------------

Customers who purchase direct from Cisco but do not hold a Cisco
service contract, and customers who purchase through third-party
vendors but are unsuccessful in obtaining fixed software through
their point of sale should acquire upgrades by contacting the Cisco
Technical Assistance Center (TAC). TAC contacts are as follows.

  * +1 800 553 2447 (toll free from within North America)
  * +1 408 526 7209 (toll call from anywhere in the world)
* e-mail: tac@cisco.com 

Customers should have their product serial number available and be
prepared to give the URL of this notice as evidence of entitlement to
a free upgrade. Free upgrades for non-contract customers must be
requested through the TAC.

Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml 
for additional TAC contact information, including localized telephone
numbers, and instructions and e-mail addresses for use in various
languages.

Exploitation and Public Announcements
====================================
Cisco is releasing this combined Cisco IOS and non-IOS product
advisory out of our normal bi-yearly IOS security advisory cycle due
to public disclosure of these vulnerabilities.

Cisco is not aware of any malicious exploitation of these
vulnerabilities.

These vulnerabilities were reported to Cisco by Dr. Tom Dunigan of
the University of Tennessee and Net-SNMP in cooperation with the CERT
Coordination Center.

Status of this Notice: FINAL
===========================
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that
omits the distribution URL in the following section is an
uncontrolled copy, and may lack important information or contain
factual errors.

Distribution
===========
This advisory is posted on Cisco's worldwide website at :

http://www.cisco.com/warp/public/707/cisco-sa-20080610-snmpv3.shtml 

In addition to worldwide web posting, a text version of this notice
is clear-signed with the Cisco PSIRT PGP key and is posted to the
following e-mail and Usenet news recipients.

* cust-security-announce@cisco.com 
* first-teams@first.org 
* bugtraq@securityfocus.com 
* vulnwatch@vulnwatch.org 
* cisco@spot.colorado.edu 
* cisco-nsp@puck.nether.net 
* full-disclosure@lists.grok.org.uk 
* comp.dcom.sys.cisco@newsgate.cisco.com 

Future updates of this advisory, if any, will be placed on Cisco's
worldwide website, but may or may not be actively announced on
mailing lists or newsgroups. Users concerned about this problem are
encouraged to check the above URL for any updates.

Revision History
===============
+---------------------------------------+
| Revision |              | Initial     |
| 1.0      | 2008-June-10 | public      |
|          |              | release     |
+---------------------------------------+

Cisco Security Procedures
========================
Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and
registering to receive security information from Cisco, is available
on Cisco's worldwide website at
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. 
This includes instructions for press inquiries regarding Cisco
security notices.  All Cisco security advisories are available at
http://www.cisco.com/go/psirt. 

- ---------------------------------------------------------------------

Updated: Jun 10, 2008                             Document ID: 107408

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