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TUCoPS :: Cisco :: bt1503.txt

SSL Implementation Vulnerabilities





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          Cisco Security Advisory: SSL Implementation Vulnerabilities

Revision 1.0

  For Public Release 2003 September 30 at 2330 GMT

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Contents

     Summary
     Affected Products
     Details
     Impact
     Software Versions and Fixes
     Obtaining Fixed Software
     Workarounds
     Exploitation and Public Announcements
     Status of This Notice: INTERIM
     Distribution
     Revision History
     Cisco Security Procedures

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Summary

   New vulnerabilities in the OpenSSL implementation for SSL
   have been announced.

   An affected network device running an SSL server based on the OpenSSL
   implementation may be vulnerable to a Denial of Service (DoS) attack when
   presented with a malformed certificate by a client. The network device is
   vulnerable to this vulnerability even if it is configured to not
   authenticate certificates from the client. There are workarounds available
   to mitigate the effects of these vulnerabilities.

   This advisory will be posted at
   http://www.cisco.com/warp/public/707/cisco-sa-20030930-ssl.shtml.

Affected Products

   The following products have their SSL implementation based on the OpenSSL
   code and may be affected by the OpenSSL vulnerabilities.

     * Cisco IOS 12.1(11)E and later in the 12.1E release train

     * Cisco PIX Firewall

     * Cisco Firewall Services Module (FWSM) for the Cisco Catalyst 6500
       Series and Cisco 7600 Series routers

     * Cisco Network Analysis Modules (NAM) for the Cisco Catalyst 6000 and
       6500 Series switches and Cisco 7600 Series routers

     * Cisco Content Service Switch (CSS) 11000 series

     * Cisco Global Site Selector (GSS) 4480

     * Cisco Application & Content Networking Software (ACNS)

     * Cisco SN 5428 Storage Router

     * CiscoWorks 1105 Hosting Solution Engine (HSE)

     * CiscoWorks 1105 Wireless LAN Solution Engine (WLSE)

     * CiscoWorks Common Services (CMF)

     * Cisco SIP Proxy Server (SPS)

   The following products, which implement SSL, are currently known to be not
   vulnerable to the OpenSSL vulnerabilities.

     * Cisco VPN 3000 Series Concentrators

     * Cisco Secure Intrusion Detection System (NetRanger) appliance. This
       includes the IDS-42xx appliances, NM-CIDS and WS-SVS-IDSM2.

     * Cisco Secure Socket Layer (SSL) Services Module for the Cisco Catalyst
       6500 Series and Cisco 7600 Series routers

     * Cisco Call Manager

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

Details

   An affected network device running an SSL server based on the OpenSSL
   implementation may be vulnerable to a Denial of Service (DoS) attack when
   presented with a malformed certificate by a client. The network device is
   vulnerable to this vulnerability even if it is configured to not
   authenticate certificates from the client.

   More information on these OpenSSL vulnerabilities is available at
   http://www.openssl.org/news/secadv_20030930.txt .

     * Cisco IOS - All 12.1(11)E and later IOS software releases in the 12.1E
       release train are affected by the OpenSSL vulnerabilities. The command
       no ip http secureserver may be used to disable the HTTPS web service
       on the device.

     * Cisco PIX Firewall - This vulnerability is documented as Bug ID
       CSCec31274 .

     * Cisco Firewall Services Module (FWSM) - This vulnerability is
       documented as Bug ID CSCec45573 .

     * Cisco Network Analysis Modules (NAM) - This vulnerability is
       documented as Bug ID CSCec45573 .

     * Cisco Content Service Switch (CSS) 11000 series - Cisco WebNS versions
       6.x and 7.x are vulnerable. WebNS version 5.x is not vulnerable to the
       OpenSSL vulnerabilities. This vulnerability is documented as Bug IDs
       CSCec45165 and CSCec45342 .

     * Cisco Global Site Selector (GSS) 4480 - This vulnerability is
       documented as Bug ID CSCec45380 .

     * Cisco Application & Content Networking Software (ACNS) - This
       vulnerability is documented as Bug ID CSCec41413 .

     * Cisco SN 5428 Storage Router - This vulnerability is documented as Bug
       ID CSCec44103 .
       
     * CiscoWorks 1105 Hosting Solution Engine (HSE) - This vulnerability is
       documented as Bug ID CSCec38542 .

     * CiscoWorks 1105 Wireless LAN Solution Engine (WLSE) - This
       vulnerability is documented as Bug ID CSCec38526 .

     * CiscoWorks Common Services (CMF) - Both Solaris and Windows version of
       CMF 2.2 and CMF 2.1 are vulnerable. Windows versions of Core 1.0 are
       also vulnerable. This vulnerability is documented as Bug ID CSCec43722

     * Cisco SIP Proxy Server (SPS) - This vulnerability is documented as Bug
       ID CSCec31901 .

Impact

   An affected network device running an SSL server based on the OpenSSL
   implementation may be vulnerable to a Denial of Service (DoS) attack when
   presented with a malformed certificate by a client regardless of whether
   it is configured to process client certificates or not.

Software Versions and Fixes

     * Cisco IOS - 12.1(14)E most likely would be the release to have this
       fix. CCO availability TBD.

     * Cisco PIX firewall - This vulnerability is fixed in software release
       6.3(3.102). CCO availability TBD.

     * Cisco Firewall Services Module (FWSM) - Fixed Software release TBD.
       CCO availability TBD.

     * Cisco Network Analysis Modules (NAM) - Fixed Software release TBD. CCO
       availability TBD.

     * Cisco Content Service Switch (CSS) 11000 series - Fixed Software
       release TBD. CCO availability TBD.

     * Cisco Global Site Selector (GSS) 4480 - Fixed Software release TBD.
       CCO availability TBD.

     * Cisco Application & Content Networking Software (ACNS) - Fixed
       Software release 5.0.7. CCO availability September 30, 2003.

     * Cisco SN 5428 Storage Router - Fixed Software version 3.4.2. CCO
       availability TBD.

     * CiscoWorks 1105 Hosting Solution Engine (HSE) - Fixed Software release
       1.7.3. CCO availability November 21, 2003.

     * CiscoWorks 1105 Wireless LAN Solution Engine (WLSE) - Fixed Software
       release 2.5. CCO availability TBD.

     * CiscoWorks Common Services (CMF) - Fixed Software release TBD. CCO
       availability TBD.

     * Cisco SIP Proxy Server (SPS) - Fixed Software release 2.2. CCO
       availability TBD.

Obtaining Fixed Software

   Cisco is offering free software upgrades or patches to address these
   vulnerabilities for all affected customers. Customers may only install and
   expect support for the feature sets they have purchased. By installing,
   downloading, accessing or otherwise using such software upgrades or
   patches, Customers agree to be bound by the terms of Cisco's software
   license terms found at
   http://www.cisco.com/public/sw-license-agreement.html, or as otherwise set
   forth at the Cisco Connection Online Software Center at
   http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

   Customers with service contracts should contact their regular update
   channels to obtain the free software upgrade(s) or patches identified via
   this advisory. For most customers with service contracts, this means that
   upgrades should be obtained through the Software Center on Cisco's
   worldwide website at http://www.cisco.com/tacpage/sw-center/. To access
   the software download URL, you must be a registered user and you must be
   logged in.

   Customers whose Cisco products are provided or maintained through a prior
   or existing agreement with third-party support organizations such as Cisco
   Partners, authorized resellers, or service providers should contact that
   support organization for assistance with obtaining the free software
   upgrade(s).

   Customers who purchased directly from Cisco but who do not hold a Cisco
   service contract, and customers who purchase through third party vendors
   but are unsuccessful at obtaining fixed software through their point of
   sale, should obtain fixed software by contacting the Cisco Technical
   Assistance Center (TAC) using the contact information listed below. In
   these cases, customers are entitled to obtain an upgrade to a later
   version of the same release or as indicated by the applicable corrected
   software version in the Software Versions and Fixes section (noted above).

   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

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

   Please have your product serial number available and give the URL of this
   notice as evidence of your entitlement to a free upgrade.

   Please do not contact either "psirt@cisco.com" or
   "security-alert@cisco.com" for software upgrades.

Workarounds

   The Cisco PSIRT recommends that affected users upgrade to a fixed software
   version of code as soon as it is available.

     * Restrict access to the HTTPS server on the network device: Allow
       access to the network device only from trusted workstations by using
       ACL's / MAC filters that are available on the affected platforms.

     * Disable the SSL server / service on the network device. This
       workaround must be weighed against the need for secure communications
       with the vulnerable device.

Exploitation and Public Announcements

   The Cisco PSIRT is not aware of any malicious use of the vulnerabilities
   described in this advisory at this time.

   These vulnerabilities have also been documented by the NISCC at
   http://www.uniras.gov.uk/vuls/2003/006489/openssl.htm .

Status of This Notice: INTERIM

   This is a interim advisory. Although Cisco cannot guarantee the accuracy
   of all statements in this advisory, all of the facts have been checked to
   the best of our ability. Cisco does not anticipate issuing updated
   versions of this advisory unless there is some material change in the
   facts. Should there be a significant change in the facts, Cisco may update
   this advisory.

   A stand-alone copy or paraphrase of the text of this security advisory
   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 will be posted on Cisco's worldwide website at
   http://www.cisco.com/warp/public/707/cisco-sa-20030930-ssl.shtml.

   In addition to worldwide website posting, a text version of this advisory
   is clear-signed with the Cisco PSIRT PGP key having the fingerprint 8C82
   5207 0CA9 ED40 1DD2 EE2A 7B31 A8CF 32B6 B590 and is posted to the
   following e-mail and Usenet news recipients.

     * cust-security-announce@cisco.com

     * first-teams@first.org (includes CERT/CC)

     * bugtraq@securityfocus.com

     * vulnwatch@vulnwatch.org

     * cisco@spot.colorado.edu

     * cisco-nsp@puck.nether.net

     * full-disclosure@lists.netsys.com

     * comp.dcom.sys.cisco

     * Various internal Cisco mailing lists

   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 1.0|2003-30-Sept|Initial 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/warp/public/707/sec_incident_response.shtml. 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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   This notice is Copyright 2003 by Cisco Systems, Inc. This notice may be
   redistributed freely after the release date given at the top of the text,
   provided that redistributed copies are complete and unmodified, and
   include all date and version information.

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