[apops] Cisco Security Advisory: Cisco IOS Software Crafted Encryption P

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Software Crafted Encryption Packet Denial of Service Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 23 Sep 2009 12:15:00 -0400
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      Cisco Security Advisory: Cisco IOS Software Crafted Encryption Packet
      Denial of Service Vulnerability
      
      Advisory ID: cisco-sa-20090923-tls
      
      Revision 1.0
      
      For Public Release 2009 September 23
      
      +---------------------------------------------------------------------
      
      Summary
      =======
      
      Cisco IOS® Software contains a vulnerability that could allow an
      attacker to cause a Cisco IOS device to reload by remotely sending a
      crafted encryption packet.
      
      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-tls.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
      =================
      
      Vulnerable Products
      +------------------
      
      Devices running affected versions of Cisco IOS Software are
      susceptible if configured with any of the following features:
      
        * Secure Socket Layer (SSL) Virtual Private Network (VPN)
        * Secure Shell (SSH)
        * Internet Key Exchange (IKE) Encrypted Nonces
      
      Note: Other SSL/HTTPS related features than WebVPN and SSL VPN are
      not affected by this vulnerability.
      
      To determine whether SSLVPN is enabled on a device, log in to the
      device and issue the command-line interface (CLI) command "show
      running-config | include webvpn". If the device returns any output
      then SSLVPN is configured and the device may be vulnerable.
      Vulnerable configurations vary depending on whether the device is
      supporting Cisco IOS WebVPN (introduced in Release 12.3(14)T) or
      Cisco IOS SSLVPNs (introduced in Release 12.4(6)T). The following
      methods describe how to confirm if the device is vulnerable:
      
      If the output from "show running-config | include webvpn" contains
      "webvpn enable" then the device is configured with the original Cisco
      IOS WebVPN. The only way to determine whether the device is
      vulnerable is to examine the output of "show running-config" to
      confirm that webvpn is enabled via the command "webvpn enable" and
      that a "ssl trustpoint" has been configured. The following example
      shows a vulnerable device configured with Cisco IOS WebVPN:
      
          webvpn enable
          !
          webvpn
           ssl trustpoint TP-self-signed-29742012
      
      If the output from "show running-config | include webvpn" contains
      "webvpn gateway <word>" then the device is supporting the Cisco IOS
      SSLVPN feature. A device is vulnerable if it has the "inservice"
      command in at least one of the "webvpn gateway" sections. The
      following example shows a vulnerable device configured with Cisco IOS
      SSLVPN:
      
          Router# show running | section webvpn        
          webvpn gateway Gateway
           ip address 10.1.1.1 port 443  
           ssl trustpoint Gateway-TP
           inservice
           !
          Router#
      
      A device that supports the Cisco IOS SSLVPN is not vulnerable if it
      has no "webvpn gateways" configured or all the configured "webvpn
      gateways" contain the "no inservice" webvpn gateway command.
      
      To determine if SSH is enabled use the "show ip ssh" command, as shown
      in the following example:
      
          Router#show ip ssh 
          SSH Enabled - version 1.99
          Authentication timeout: 120 secs; Authentication retries: 3
          Minimum expected Diffie Hellman key size : 1024 bits
      
      To determine if the IKE encrypted nonces feature is enabled, use the 
      "show running-config | include rsa-encr" command as follows:
      
          Router#show running-config | inc rsa-encr
           authentication rsa-encr
      
      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 product that is running
      Cisco IOS Software Release 12.3(26) with an installed image name of
      C2500-IS-L:
      
          Router#show version
          Cisco Internetwork Operating System Software
          IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2008 by cisco Systems, Inc.
          Compiled Mon 17-Mar-08 14:39 by dchih
          
          
          !--- output truncated
          
      
      The following example identifies a Cisco product that is running
      Cisco IOS Software Release 12.4(20)T with an installed image name of
      C1841-ADVENTERPRISEK9-M:
      
          Router#show version
          Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2008 by Cisco Systems, Inc.
          Compiled Thu 10-Jul-08 20:25 by prod_rel_team
          
          
          !--- output truncated
          
      
      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
      +--------------------------------
      
      The Cisco ASA 5500 Series Adaptive Security Appliances are not
      affected by this vulnerability.
      
      Cisco IOS XR Software is not affected by this vulnerability.
      
      No other Cisco products are currently known to be affected by this
      vulnerability.
      
      Details
      =======
      
      A Cisco IOS device that is configured for SSLVPN or SSH may reload
      when it receives a specially crafted TCP packet on TCP port 443
      (SSLVPN) or TCP port 22 (SSH). Completion of the three-way handshake
      to the associated TCP port number of these features is required for
      the vulnerability to be successfully exploited; however,
      authentication is not required. A Cisco IOS device that is configured
      for IKE encrypted nonces may reload when it receives a specially
      crafted UDP packet on port 500 or 4500 (if configured for NAT
      Traversal (NAT-T)).
      
      This vulnerability is documented in Cisco bug ID CSCsq24002 and has
      been assigned the Common Vulnerabilities and Exposures (CVE) identifier
      CVE-2009-2871.
      
      Vulnerability Scoring Details
      =============================
      
      Cisco has provided scores for the vulnerability 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
      
      CSCsq24002 - Crafted Encrypted packet may cause device reload
      
      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 the vulnerability described in this
      document may result in a reload of the device. The issue could be
      repeatedly exploited to cause an extended DoS condition.
      
      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                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2EX     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2EY     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2EZ     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2FX     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2FY     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2FZ     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2IRA    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2IRB    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2IRC    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 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                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2SB     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2SBC    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2SCA    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2SCB    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2SE     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 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    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2SRB    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2SRC    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2SRD    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 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                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2SXH    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.2SXI    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 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  |                                        |             |
      |-------------------------------------------------------------------|
      | There are no affected 12.3 based releases.                        |
      |-------------------------------------------------------------------|
      |  Affected  |                                        | Recommended |
      | 12.4-Based |          First Fixed Release           |   Release   |
      |  Releases  |                                        |             |
      |------------+----------------------------------------+-------------|
      | 12.4       | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 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     | 12.4(15)MD3                            | 12.4(15)MD3 |
      |------------+----------------------------------------+-------------|
      | 12.4MDA    | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4MR     | 12.4(19)MR3                            | 12.4(19)MR3 |
      |------------+----------------------------------------+-------------|
      |            |                                        | 12.4(15)T10 |
      | 12.4SW     | Vulnerable; first fixed in 12.4T       |             |
      |            |                                        | 12.4(20)T4  |
      |------------+----------------------------------------+-------------|
      |            | 12.4(22)T2                             |             |
      |            |                                        | 12.4(15)T10 |
      | 12.4T      | 12.4(20)T3                             |             |
      |            |                                        | 12.4(20)T4  |
      |            | 12.4(24)T                              |             |
      |------------+----------------------------------------+-------------|
      | 12.4XA     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4XB     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4XC     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4XD     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4XE     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      |            |                                        | 12.4(15)T10 |
      | 12.4XF     | Vulnerable; first fixed in 12.4T       |             |
      |            |                                        | 12.4(20)T4  |
      |------------+----------------------------------------+-------------|
      | 12.4XG     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      |            |                                        | 12.4(15)T10 |
      | 12.4XJ     | Vulnerable; first fixed in 12.4T       |             |
      |            |                                        | 12.4(20)T4  |
      |------------+----------------------------------------+-------------|
      |            |                                        | 12.4(15)T10 |
      | 12.4XK     | Vulnerable; first fixed in 12.4T       |             |
      |            |                                        | 12.4(20)T4  |
      |------------+----------------------------------------+-------------|
      | 12.4XL     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4XM     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4XN     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4XP     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4XQ     | 12.4(15)XQ3                            | 12.4(15)T10 |
      |------------+----------------------------------------+-------------|
      |            |                                        | 12.4(15)XR7 |
      | 12.4XR     | 12.4(15)XR5                            |             |
      |            |                                        | 12.4(22)XR  |
      |------------+----------------------------------------+-------------|
      | 12.4XT     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      |            | Vulnerable; Contact your support       |             |
      | 12.4XV     | organization per the instructions in   |             |
      |            | Obtaining Fixed Software section of    |             |
      |            | this advisory                          |             |
      |------------+----------------------------------------+-------------|
      |            |                                        | 12.4(15)T10 |
      | 12.4XW     | Vulnerable; first fixed in 12.4T       |             |
      |            |                                        | 12.4(20)T4  |
      |------------+----------------------------------------+-------------|
      |            |                                        | 12.4(15)T10 |
      | 12.4XY     | Vulnerable; first fixed in 12.4T       |             |
      |            |                                        | 12.4(20)T4  |
      |------------+----------------------------------------+-------------|
      |            |                                        | 12.4(15)T10 |
      | 12.4XZ     | Vulnerable; first fixed in 12.4T       |             |
      |            |                                        | 12.4(20)T4  |
      |------------+----------------------------------------+-------------|
      |            |                                        | 12.4(15)T10 |
      | 12.4YA     | Vulnerable; first fixed in 12.4T       |             |
      |            |                                        | 12.4(20)T4  |
      |------------+----------------------------------------+-------------|
      | 12.4YB     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4YD     | Not Vulnerable                         |             |
      |------------+----------------------------------------+-------------|
      | 12.4YE     | Not Vulnerable                         |             |
      +-------------------------------------------------------------------+
      
      Note: No Cisco IOS Software Modularity releases are affected by this
      vulnerability.
      
      Cisco IOS XE Software
      
      +-------------------------------------------------------------------+
      |       IOS XE Release       |         First Fixed Release          |
      |----------------------------+--------------------------------------|
      | 2.1.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.2.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.3.x                      | 2.3.2                                |
      |----------------------------+--------------------------------------|
      | 2.4.x                      | Not Vulnerable                       |
      +-------------------------------------------------------------------+
      
      Workarounds
      ===========
      
      There are no available workarounds other than disabling the affected
      features and protecting SSH access with the use of VTY access control
      lists.
      
      Use the "no webvpn enable" command to disable SSL VPN use.
      
      For Cisco IOS the SSH server can be disabled by applying the command 
      "crypto key zeroize rsa" while in configuration mode. The SSH server is
      enabled automatically upon generating an RSA key pair. Zeroing the
      RSA keys is the only way to completely disable the SSH server.
      
      Access to the SSH server on Cisco IOS Software may also be disabled
      by removing SSH as a valid transport protocol. This action can be
      done by reapplying the transport input command with 'ssh' removed
      from the list of permitted transports on vty lines while in
      configuration mode. For example:
      
          line vty 0 4                                                                    
                transport input telnet                                                        
              end
      
      If SSH server functionality is desired, access to the server can be
      restricted to specific source IP addresses or blocked entirely
      through the use of Access Control Lists (ACLs) on the vty lines as
      shown in the following URL:
      
      http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_9_ea1/configuration/guide/swacl.html#xtocid14
      
      More information on configuring ACLs can be found on Cisco's public
      website:
      
      http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a00800a5b9a.shtml
      
      The following is an example of a vty access-list:
      
          access-list 2 permit 10.1.1.0 0.0.0.255
          access-list 2 deny any
          
          line vty 0 4
           access-class 2 in
      
      In the previous example, only the 10.1.1.0/24 network is allowed to
      SSH to the Cisco IOS device.
      
      To disable IKE encrypted nonces use the "no authentication rsa-encr"
      command under an ISAKMP policy, as shown in the following example:
      
          crypto isakmp policy
           no authentication rsa-encr
      
      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 at cisco dot com or security-alert at cisco dot 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 at cisco dot 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 found during internal testing.
      
      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-tls.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 at cisco dot com
        * first-bulletins at lists dot first dot org
        * bugtraq at securityfocus dot com
        * vulnwatch at vulnwatch dot org
        * cisco at spot dot colorado dot edu
        * cisco-nsp at puck dot nether dot net
        * full-disclosure at lists.grok dot org dot uk
        * comp.dcom.sys.cisco at newsgate dot cisco dot 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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