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TUCoPS :: Cisco :: bu-695.htm

Cisco IOS Software Internet Key Exchange Resource Exhaustion Vulnerability



Cisco Security Advisory: Cisco IOS Software Internet Key Exchange Resource Exhaustion Vulnerability
Cisco Security Advisory: Cisco IOS Software Internet Key Exchange Resource Exhaustion Vulnerability



-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Cisco Security Advisory: Cisco IOS Software Internet Key Exchange
Resource Exhaustion Vulnerability

Advisory ID: cisco-sa-20090923-ipsec

Revision 1.0

For Public Release 2009 September 23

+---------------------------------------------------------------------

Summary
======
Cisco IOS=AE devices that are configured for Internet Key Exchange
(IKE) protocol and certificate based authentication are vulnerable to
a resource exhaustion attack. Successful exploitation of this
vulnerability may result in the allocation of all available Phase 1
security associations (SA) and prevent the establishment of new IPsec
sessions.

Cisco has released free software updates that address this
vulnerability.

This advisory is posted at:

http://www.cisco.com/warp/public/707/cisco-sa-20090923-ipsec.shtml 

Note: The September 23, 2009, Cisco IOS Security Advisory bundled
publication includes eleven Security Advisories. Ten of the
advisories address vulnerabilities in Cisco IOS Software, and one
advisory addresses a vulnerability in Cisco Unified Communications
Manager. Each advisory lists the releases that correct the
vulnerability or vulnerabilities detailed in the advisory. The
following table lists releases that correct all Cisco IOS Software
vulnerabilities that have been published on September 23, 2009, or
earlier.

http://www.cisco.com/warp/public/707/cisco-sa-20090923-bundle.shtml 

Individual publication links are in "Cisco Event Response: Semiannual
Cisco IOS Software Advisory Bundled Publication" at the following
link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep09.html 

Affected Products
================
Cisco IOS devices that are configured for IKE and certificate based
authentication are affected.

Vulnerable Products
+------------------

IKE is enabled by default if IPsec is used. Cisco IOS devices that
are configured for IKE will listen on UDP port 500, UDP port 4500 if
the device is configured for NAT Traversal (NAT-T), or UDP ports 848
or 4848 if the device is configured for Group Domain of
Interpretation (GDOI). The following outputs show a router that is
listening on UDP port 500:

    Router#show ip sockets 
    Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
    ....
     17   --listen--          192.168.66.129    500   0   0   11   0 
    ....

Or

    Router-#show udp
    Proto        Remote      Port      Local       Port  In Out  Stat TTY OutputIF
     17       --listen--          192.0.2.1         500   0   0  1011   0 
     17(v6)   --listen--          --any--           500   0   0 20011   0 
    Router#

IKE configurations that are performing certificate based
authentication will display "Rivest-Shamir-Adleman Signature" as the
authentication method in the output of the "show crypto isakmp policy"
command. This output is shown in the following example:

    Router#show crypto isakmp policy                               
    
    Global IKE policy
    Default protection suite
            encryption algorithm:   DES - Data Encryption Standard (56 bit keys).
            hash algorithm:         Secure Hash Standard
            authentication method:  Rivest-Shamir-Adleman Signature
            Diffie-Hellman group:   #1 (768 bit)
            lifetime:               86400 seconds, no volume limit

To determine the Cisco IOS Software release that is running on a
Cisco product, administrators can log in to the device and issue the 
"show version" command to display the system banner. The system banner
confirms that the device is running Cisco IOS Software by displaying
text similar to "Cisco Internetwork Operating System Software" or
"Cisco IOS Software." The image name displays in parentheses,
followed by "Version" and the Cisco IOS Software release name. Other
Cisco devices do not have the "show version" command or may provide
different output.

The following example identifies a Cisco 6500 Series device that is
running Cisco IOS Software release 12.2(18)SXF7 with an installed
image name of s72033_rp-IPSERVICESK9_WAN-M:

    Router#show version 
    Cisco Internetwork Operating System Software 
    IOS (tm) s72033_rp Software (s72033_rp-IPSERVICESK9_WAN-M), Version 12.2(18)SXF7, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport 
    Copyright =A9) 1986-2006 by cisco Systems, Inc.
    Compiled Thu 23-Nov-06 06:42 by kellythw
    

Additional information about Cisco IOS Software release naming
conventions is available in "White Paper: Cisco IOS Reference Guide"
at the following link:

http://www.cisco.com/warp/public/620/1.html 

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

Cisco IOS XR Software is not affected by this vulnerability.

No other Cisco products are currently known to be affected by this
vulnerability.

Details
======
IPsec is an IP security feature that provides robust authentication
and encryption of IP packets. IKE is a key management protocol
standard that is used in conjunction with the IPsec standard.

IKE is a hybrid protocol that implements the Oakley and SKEME key
exchanges inside the Internet Security Association and Key Management
Protocol (ISAKMP) framework. (ISAKMP, Oakley, and SKEME are security
protocols that are implemented by IKE.). More information on IKE is
available at the following link:

http://www.cisco.com/en/US/docs/ios/12_1/security/configuration/guide/scdike.html 

A vulnerability exists in the IKE implementation of Cisco IOS
Software, if the certificate based authentication method is used.
Successful exploitation of this vulnerability may result in the
allocation of all available Phase 1 SAs, which may prevent new IPSec
sessions from being established.

Administrators can view Phase 1 SAs that are allocated as a result of
exploitation by issuing the "show crypto isakmp sa" command. The
following example displays sample output for this command:

    Router#show crypto isakmp sa
    IPv4 Crypto ISAKMP SA
    dst             src             state          conn-id slot status
    10.48.66.77     10.48.66.6      MM_KEY_EXCH       1004 ACTIVE
    10.48.66.77     10.48.66.6      MM_KEY_EXCH       1003 ACTIVE
    10.48.66.77     10.48.66.6      MM_KEY_EXCH       1002 ACTIVE
    ....

Any allocated SA can be de-allocated up manually by using the "clear
crypto isakmp " command.

This vulnerability is addressed by the Cisco Bug IDs CSCsy07555 and
CSCee72997 and has been assigned Common Vulnerabilities and Exposures
(CVE) ID CVE-2009-2868.

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 

CSCsy07555 - P1 SA stuck in KEY_EXCH forever

CVSS Base Score - 7.8

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

CVSS Temporal Score - 6.4

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

CSCee72997 - P1 SA stuck in KEY_EXCH forever

CVSS Base Score - 7.8

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

CVSS Temporal Score - 6.4

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

Impact
=====
Successful exploitation of this vulnerability may result in the
allocation of all available Phase 1 SAs, which may prevent new IPsec
sessions from being established.

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 Releases           |
|  Release   |                                                      |
|------------+------------------------------------------------------|
|  Affected  |                                       | Recommended  |
| 12.0-Based |          First Fixed Release          |   Release    |
|  Releases  |                                       |              |
|-------------------------------------------------------------------|
| There are no affected 12.0 based releases                         |
|-------------------------------------------------------------------|
|  Affected  |                                       | Recommended  |
| 12.1-Based |          First Fixed Release          |   Release    |
|  Releases  |                                       |              |
|-------------------------------------------------------------------|
| There are no affected 12.1 based releases                         |
|-------------------------------------------------------------------|
|  Affected  |                                       | Recommended  |
| 12.2-Based |          First Fixed Release          |   Release    |
|  Releases  |                                       |              |
|------------+---------------------------------------+--------------|
| 12.2       | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2B      | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2BC     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2BW     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2BX     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2BY     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2BZ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2CX     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2CY     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2CZ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2DA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2DD     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2DX     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2EW     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2EWA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            | Releases prior to 12.2(44)EX are      | 12.2(50)SE3  |
|            | vulnerable, release 12.2(44)EX and    |              |
| 12.2EX     | later are not vulnerable; migrate to  | 12.2(52)SE;  |
|            | any release in 12.2SEG                | Available on |
|            |                                       | 13-OCT-2009  |
|------------+---------------------------------------+--------------|
| 12.2EY     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2EZ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2FX     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2FY     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2FZ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2IRA    | Vulnerable; first fixed in 12.2SRD    | 12.2(33)SRD3 |
|------------+---------------------------------------+--------------|
| 12.2IRB    | Vulnerable; first fixed in 12.2SRD    | 12.2(33)SRD3 |
|------------+---------------------------------------+--------------|
|            | Vulnerable; Contact your support      |              |
| 12.2IRC    | organization per the instructions in  |              |
|            | Obtaining Fixed Software section of   |              |
|            | this advisory                         |              |
|------------+---------------------------------------+--------------|
| 12.2IXA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2IXB    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2IXC    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2IXD    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2IXE    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2IXF    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2IXG    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2IXH    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2JA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2JK     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2MB     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2MC     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2S      | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            |                                       | 12.2(31)SB16 |
| 12.2SB     | 12.2(33)SB6                           |              |
|            |                                       | 12.2(33)SB7  |
|------------+---------------------------------------+--------------|
| 12.2SBC    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SCA    | Vulnerable; first fixed in 12.2SCB    | 12.2(33)SCB4 |
|------------+---------------------------------------+--------------|
| 12.2SCB    | 12.2(33)SCB4                          | 12.2(33)SCB4 |
|------------+---------------------------------------+--------------|
|            |                                       | 12.2(50)SE3  |
|            | 12.2(50)SE3                           |              |
| 12.2SE     |                                       | 12.2(52)SE;  |
|            | 12.2(52)SE; Available on 13-OCT-2009  | Available on |
|            |                                       | 13-OCT-2009  |
|------------+---------------------------------------+--------------|
| 12.2SEA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SEB    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SEC    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SED    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SEE    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SEF    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SEG    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SG     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SGA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SL     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SM     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SO     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SQ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SRA    | Vulnerable; first fixed in 12.2SRD    | 12.2(33)SRD3 |
|------------+---------------------------------------+--------------|
| 12.2SRB    | Vulnerable; first fixed in 12.2SRD    | 12.2(33)SRD3 |
|------------+---------------------------------------+--------------|
| 12.2SRC    | 12.2(33)SRC5; Available on            | 12.2(33)SRD3 |
|            | 29-OCT-2009                           |              |
|------------+---------------------------------------+--------------|
|            | 12.2(33)SRD3                          |              |
| 12.2SRD    |                                       | 12.2(33)SRD3 |
|            | 12.2(33)SRD2a                         |              |
|------------+---------------------------------------+--------------|
| 12.2STE    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SU     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SV     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SVA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SVC    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SVD    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SVE    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SW     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SX     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SXA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SXB    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SXD    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SXE    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SXF    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            | 12.2(33)SXH6; Available on            | 12.2(33)     |
|            | 30-OCT-2009                           | SXH6;        |
| 12.2SXH    |                                       | Available on |
|            | Please see IOS Software Modularity    | 30-OCT-2009  |
|            | Patch                                 |              |
|------------+---------------------------------------+--------------|
| 12.2SXI    | 12.2(33)SXI2a                         | 12.2(33)     |
|            |                                       | SXI2a        |
|------------+---------------------------------------+--------------|
| 12.2SY     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2SZ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2T      | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2TPC    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XB     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XC     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XD     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XE     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XF     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XG     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XH     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XI     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XJ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XK     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XL     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XM     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XNA    | Please see Cisco IOS-XE Software      |              |
|            | Availability                          |              |
|------------+---------------------------------------+--------------|
| 12.2XNB    | Please see Cisco IOS-XE Software      |              |
|            | Availability                          |              |
|------------+---------------------------------------+--------------|
| 12.2XNC    | Please see Cisco IOS-XE Software      |              |
|            | Availability                          |              |
|------------+---------------------------------------+--------------|
| 12.2XND    | Please see Cisco IOS-XE Software      |              |
|            | Availability                          |              |
|------------+---------------------------------------+--------------|
| 12.2XO     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XQ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XR     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XS     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XT     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XU     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XV     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2XW     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YB     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YC     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YD     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YE     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YF     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YG     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YH     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YJ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YK     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YL     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YM     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YN     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YO     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YP     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YQ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YR     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YS     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YT     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YU     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YV     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YW     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YX     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YY     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2YZ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZB     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZC     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZD     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZE     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZF     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZG     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZH     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZJ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZL     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZP     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZU     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZX     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZY     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.2ZYA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|  Affected  |                                       | Recommended  |
| 12.3-Based |          First Fixed Release          |   Release    |
|  Releases  |                                       |              |
|------------+---------------------------------------+--------------|
| 12.3       | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3B      | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3BC     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3BW     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3EU     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3JA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3JEA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3JEB    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3JEC    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3JK     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3JL     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3JX     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            | Vulnerable; first fixed in 12.4       | 12.4(25b)    |
| 12.3T      |                                       |              |
|            | Releases up to and including 12.3(8)  | 12.4(23b)    |
|            | T11 are not vulnerable.               |              |
|------------+---------------------------------------+--------------|
| 12.3TPC    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3VA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XB     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XC     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XD     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XE     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XF     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XG     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XI     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XJ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XK     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
|            |                                       | 12.4(22)T3   |
| 12.3XL     | Vulnerable; first fixed in 12.4T      |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
| 12.3XQ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(25b)    |
| 12.3XR     | Vulnerable; first fixed in 12.4       |              |
|            |                                       | 12.4(23b)    |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(25b)    |
| 12.3XS     | Vulnerable; first fixed in 12.4       |              |
|            |                                       | 12.4(23b)    |
|------------+---------------------------------------+--------------|
| 12.3XU     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XW     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(25b)    |
| 12.3XX     | Vulnerable; first fixed in 12.4       |              |
|            |                                       | 12.4(23b)    |
|------------+---------------------------------------+--------------|
| 12.3XY     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.3XZ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(25b)    |
| 12.3YA     | Vulnerable; first fixed in 12.4       |              |
|            |                                       | 12.4(23b)    |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.3YD     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            | Vulnerable; migrate to any release in | 12.4(15)XR7  |
| 12.3YF     | 12.4XN                                |              |
|            |                                       | 12.4(22)XR   |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.3YG     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.3YH     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.3YI     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
| 12.3YJ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.3YK     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
| 12.3YM     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.3YQ     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.3YS     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.3YT     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.3YU     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            | Vulnerable; migrate to any release in | 12.4(15)XR7  |
| 12.3YX     | 12.4XN                                |              |
|            |                                       | 12.4(22)XR   |
|------------+---------------------------------------+--------------|
|            | Vulnerable; Contact your support      |              |
| 12.3YZ     | organization per the instructions in  |              |
|            | Obtaining Fixed Software section of   |              |
|            | this advisory                         |              |
|------------+---------------------------------------+--------------|
| 12.3ZA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|  Affected  |                                       | Recommended  |
| 12.4-Based |          First Fixed Release          |   Release    |
|  Releases  |                                       |              |
|------------+---------------------------------------+--------------|
|            | Releases prior to 12.4(7) are         | 12.4(25b)    |
| 12.4       | vulnerable; Releases 12.4(7a) and     |              |
|            | later are not vulnerable.             | 12.4(23b)    |
|------------+---------------------------------------+--------------|
| 12.4GC     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4JA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4JDA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4JDC    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4JDD    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4JK     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4JL     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4JMA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4JMB    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4JX     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4MD     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4MDA    | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4MR     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4SW     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            | 12.4(4)T8                             | 12.4(20)T4   |
|            |                                       |              |
| 12.4T      | 12.4(9)T                              | 12.4(22)T3   |
|            |                                       |              |
|            | 12.4(6)T1                             | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.4XA     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.4XB     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.4XC     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
|            |                                       | 12.4(15)T10  |
|            |                                       |              |
|            |                                       | 12.4(20)T4   |
|            |                                       |              |
| 12.4XD     | Vulnerable; first fixed in 12.4T      | 12.4(22)T3   |
|            |                                       |              |
|            |                                       | 12.4(24)T2;  |
|            |                                       | Available on |
|            |                                       | 23-OCT-2009  |
|------------+---------------------------------------+--------------|
| 12.4XE     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 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                        |              |
|------------+---------------------------------------+--------------|
| 12.4XP     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4XQ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4XR     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4XT     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4XV     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4XW     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4XY     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4XZ     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4YA     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4YB     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4YD     | Not Vulnerable                        |              |
|------------+---------------------------------------+--------------|
| 12.4YE     | Not Vulnerable                        |              |
+-------------------------------------------------------------------+

Cisco IOS XE Software
+--------------------

+-------------------------------------------------------------------+
|     Cisco IOS XE Software Release     |    First Fixed Release    |
|---------------------------------------+---------------------------|
| 2.1.x                                 | 2.3.0t                    |
|---------------------------------------+---------------------------|
| 2.2.x                                 | 2.3.0t                    |
|---------------------------------------+---------------------------|
| 2.3.x                                 | Not Vulnerable            |
|---------------------------------------+---------------------------|
| 2.4.x                                 | Not Vulnerable            |
+-------------------------------------------------------------------+

Cisco IOS Software Modularity - Maintenance Packs
+------------------------------------------------

Customers who are using Cisco IOS Software Modularity can apply the
respective maintenance packs. More information on Cisco IOS Software
Modularity can be found at the following link:

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_bulletin0900aecd80313e15.html 

The Maintenance Packs listed below can be downloaded at:

http://www.cisco.com/go/pn 

Cisco IOS Software Modularity Maintenance Pack for 12.2SXH
+---------------------------------------------------------

+-------------------------------------------------------------------+
|  Cisco IOS Software Release   |   Solution Maintenance Pack(MP)   |
|-------------------------------+-----------------------------------|
| 12.2(33)SXH3                  | MP003                             |
|-------------------------------+-----------------------------------|
| 12.2(33)SXH4                  | MP002                             |
|-------------------------------+-----------------------------------|
| 12.2(33)SXH5                  | MP001                             |
+-------------------------------------------------------------------+

Workarounds
==========
There are no workarounds for this vulnerability.

Additional mitigations that can be deployed on Cisco devices in the
network are available in the Cisco Applied Mitigation Bulletin
companion document for this advisory, which is available at the
following link:

http://www.cisco.com/warp/public/707/cisco-amb-20090923-ipsec.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/docs/general/warranty/English/EU1KEN_.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/en/US/support/tsd_cisco_worldwide_contacts.html 

for additional TAC contact information, including localized telephone
numbers, and instructions and e-mail addresses for use in various
languages.

Exploitation and Public Announcements
====================================
The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerability described in this advisory.

This vulnerability was reported to Cisco by a customer.

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-20090923-ipsec.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-bulletins@lists.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      | 2009-September-23 | 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 
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