[apops] Cisco Security Advisory: Cisco IOS Software WebVPN and SSLVPN Vu

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Software WebVPN and SSLVPN Vulnerabilities
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 25 Mar 2009 17:00:00 +0100
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      Cisco Security Advisory: Cisco IOS Software WebVPN and SSLVPN
      Vulnerabilities
      
      Advisory ID: cisco-sa-20090325-webvpn
      
      http://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml
      
      Revision 1.0
      
      For Public Release 2009 March 25 1600 UTC (GMT)
      
      - ---------------------------------------------------------------------
      
      Summary
      =======
      
      Cisco IOS software contains two vulnerabilities within the Cisco IOS
      WebVPN or Cisco IOS SSLVPN feature (SSLVPN) that can be remotely
      exploited without authentication to cause a denial of service
      condition. Both vulnerabilities affect both Cisco IOS WebVPN and
      Cisco IOS SSLVPN features:
      
       1. Crafted HTTPS packet will crash device.
       2. SSLVPN sessions cause a memory leak in the device.
      
      Cisco has released free software updates that address these
      vulnerabilities.
      
      There are no workarounds that mitigate these vulnerabilities.
      
      This advisory is posted at the following link: 
      http://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml
      
      Note: The March 25, 2009, Cisco IOS Security Advisory bundled
      publication includes eight Security Advisories. All of the advisories
      address vulnerabilities in Cisco IOS Software. Each advisory lists
      the releases that correct the vulnerability or vulnerabilities in the
      advisory. The following table lists releases that correct all Cisco
      IOS Software vulnerabilities that have been published in Cisco
      Security Advisories on March 25, 2009, or earlier.
      
      http://www.cisco.com/warp/public/707/cisco-sa-20090325-bundle.shtml
      
      Individual publication links are listed below:
      
        * Cisco IOS cTCP Denial of Service Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml
      
        * Cisco IOS Software Multiple Features IP Sockets Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml
      
        * Cisco IOS Software Mobile IP and Mobile IPv6 Vulnerabilities
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml
      
        * Cisco IOS Software Secure Copy Privilege Escalation Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml
      
        * Cisco IOS Software Session Initiation Protocol Denial of Service
          Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.shtml
      
        * Cisco IOS Software Multiple Features Crafted TCP Sequence
          Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml
      
        * Cisco IOS Software Multiple Features Crafted UDP Packet
          Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-udp.shtml
      
        * Cisco IOS Software WebVPN and SSLVPN Vulnerabilities
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      Devices running affected versions of Cisco IOS software are affected
      if configured with SSLVPN.
      
      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 shows a product that is running Cisco IOS
      Software release 12.4(20)T with an 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
      
      To determine that SSLVPN is enabled on your 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
      this means that SSLVPN is configured on the device 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 confirm 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.
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      The following products are not affected by this vulnerability:
      
        * Cisco ASA 5500 Series Adaptive Security Appliances
        * Cisco IOS XR Software
        * Cisco IOS XE Software
      
      No other Cisco products are currently known to be affected by these
      vulnerabilities.
      
      Details
      =======
      
      The Cisco SSLVPN feature provides remote access to enterprise sites
      by users from anywhere on the Internet. The SSLVPN provides users
      with secure access to specific enterprise applications, such as
      e-mail and web browsing, without requiring them to have VPN client
      software installed on their end-user devices.
      
      The WebVPN Enhancements feature (Cisco IOS SSLVPN), released in Cisco
      IOS Release 12.4(6)T, obsoletes the commands and configurations
      originally put forward in Cisco IOS WebVPN.
      
      Further information about Cisco IOS WebVPN is available in the "Cisco
      IOS Software Release 12.3T WebVPN feature guide" at the following
      link: 
      http://www.cisco.com/en/US/docs/ios/12_3t/12_3t14/feature/guide/g_sslvpn.html
      
      Further information about Cisco IOS SSLVPN is available in the "Cisco
      IOS Software Release 12.4T SSLVPN feature guide" at the following
      link: http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/htwebvpn.html
      
      Details regarding these two vulnerabilities in Cisco IOS devices that
      are running affected versions of system software are:
      
      Crafted HTTPS packet will crash device
      +--------------------------------------
      
      A device configured for SSLVPN may reload or hang when it receives a
      specially crafted HTTPS packet. Completion of the 3-way handshake to
      the associated TCP port number of the SSLVPN feature is required in
      order for the vulnerability to be successfully exploited, however
      authentication is "not" required. The default TCP port number for
      SSLVPN is 443.
      
      This vulnerability is documented in Cisco bug ID CSCsk62253 
      and Common Vulnerabilities and Exposures (CVE) identifier 
      CVE-2009-0626 has been assigned to this vulnerability.
      
      SSLVPN sessions cause a memory leak in the device
      +------------------------------------------------
      
      A device configured for SSLVPN may leak transmission control blocks
      (TCBs) when processing an abnormally disconnected SSL session.
      Continued exploitation may result in the device depleting its memory
      resources and result in a crash of the device. Authentication is
      "not" required to exploit this vulnerability.
      
      The memory leak can be detected by running the command "show tcp
      brief", like in the following example:
      
          Router#show tcp brief
          TCB       Local Address      Foreign Address     (state)
          468BBDC0  192.168.0.22.443   192.168.0.33.19794   CLOSEWAIT
          482D4730  192.168.0.22.443   192.168.0.33.22092   CLOSEWAIT
          482779A4  192.168.0.22.443   192.168.0.33.16978   CLOSEWAIT
          4693DEBC  192.168.0.22.443   192.168.0.33.21580   CLOSEWAIT
          482D3418  192.168.0.22.443   192.168.0.33.17244   CLOSEWAIT
          482B8ACC  192.168.0.22.443   192.168.0.33.16564   CLOSEWAIT
          46954EB0  192.168.0.22.443   192.168.0.33.19532   CLOSEWAIT
          468BA9B8  192.168.0.22.443   192.168.0.33.15781   CLOSEWAIT
          482908C4  192.168.0.22.443   192.168.0.33.19275   CLOSEWAIT
          4829D66C  192.168.0.22.443   192.168.0.33.19314   CLOSEWAIT
          468A2D94  192.168.0.22.443   192.168.0.33.14736   CLOSEWAIT
          4688F590  192.168.0.22.443   192.168.0.33.18786   CLOSEWAIT
          4693CBA4  192.168.0.22.443   192.168.0.33.12176   CLOSEWAIT
          4829ABC4  192.168.0.22.443   192.168.0.33.39629   CLOSEWAIT
          4691206C  192.168.0.22.443   192.168.0.33.17818   CLOSEWAIT
          46868224  192.168.0.22.443   192.168.0.33.16774   CLOSEWAIT
          4832BFAC  192.168.0.22.443   192.168.0.33.39883   CLOSEWAIT
          482D10CC  192.168.0.22.443   192.168.0.33.13677   CLOSEWAIT
          4829B120  192.168.0.22.443   192.168.0.33.20870   CLOSEWAIT
          482862FC  192.168.0.22.443   192.168.0.33.17035   CLOSEWAIT
          482EC13C  192.168.0.22.443   192.168.0.33.16053   CLOSEWAIT
          482901D8  192.168.0.22.443   192.168.0.33.16200   CLOSEWAIT
      
      In the output above, those Transmission Control Blocks (TCBs) in the
      state CLOSEWAIT will not go away and represent memory leaks. Please
      note that only TCP connections with a local TCP port of 443 (the
      well-known port for HTTPS) are relevant.
      
      This vulnerability is documented in Cisco bug ID CSCsw24700 
      and Common Vulnerabilities and Exposures (CVE) identifier 
      CVE-2009-0628 has been assigned to this vulnerability.
      
      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 
      
      CSCsk62253 - Crafted HTTPS packet will crash device.
      
      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
      
      
      CSCsw24700 - SSLVPN sessions cause a memory leak in the device.
      
      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 any of the two vulnerabilities may result
      in the device crashing, not accepting any new SSLVPN sessions or a
      memory leak. Repeated exploitation may result in an extended denial
      of service (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   |                                      |               |
      |-------------------------------------------------------------------|
      | There are no affected 12.2 based releases                         |
      |-------------------------------------------------------------------|
      | 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                       |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.3T      | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.3TPC    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3VA     | Vulnerable; contact TAC              |               |
      |------------+--------------------------------------+---------------|
      | 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                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XL     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XQ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XR     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XS     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XU     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XW     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XX     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XY     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XZ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YD     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YF     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YG     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YH     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YI     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YJ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            | Releases prior to 12.3(11)YK3 are    | 12.4(22)T1    |
      |            | vulnerable, release 12.3(11)YK3 and  |               |
      | 12.3YK     | later are not vulnerable; first      | 12.4(15)T9;   |
      |            | fixed in 12.4T                       | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.3YM     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.3YQ     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.3YS     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.3YT     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.3YU     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.3YX     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YZ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3ZA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | Affected   |                                      | Recommended   |
      | 12.4-Based | First Fixed Release                  | Release       |
      | Releases   |                                      |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(18e)     |
      |            | 12.4(18e)                            |               |
      | 12.4       |                                      | 12.4(23a);    |
      |            | 12.4(23a); Available on 30-APR-2009  | Available on  |
      |            |                                      | 30-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.4JA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4JDA    | 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                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4MR     | 12.4(16)MR                           | 12.4(19)MR2   |
      |------------+--------------------------------------+---------------|
      | 12.4SW     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            | 12.4(15)T7                           | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4T      | 12.4(20)T                            | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            | 12.4(15)T9; Available on 29-APR-2009 | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XA     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XB     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XC     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            | 12.4(4)XD12; Available on            | 12.4(4)XD12;  |
      | 12.4XD     | 27-MAR-2009                          | Available on  |
      |            |                                      | 27-MAR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XE     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.4XF     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XG     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XJ     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.4XK     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XL     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XM     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XN     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XP     | Vulnerable; contact TAC              |               |
      |------------+--------------------------------------+---------------|
      | 12.4XQ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XR     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XT     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.4XV     | Vulnerable; contact TAC              |               |
      |------------+--------------------------------------+---------------|
      | 12.4XW     | 12.4(11)XW10                         | 12.4(11)XW10  |
      |------------+--------------------------------------+---------------|
      | 12.4XY     | 12.4(15)XY4                          | 12.4(22)T1    |
      |------------+--------------------------------------+---------------|
      | 12.4XZ     | 12.4(15)XZ1                          | 12.4(15)XZ2   |
      |------------+--------------------------------------+---------------|
      | 12.4YA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4YB     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4YD     | Not Vulnerable                       |               |
      +-------------------------------------------------------------------+
      
      Workarounds
      ===========
      
      There are no workarounds for the vulnerabilities described in this
      advisory.
      
      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/warp/public/687/Directory/DirTAC.shtml
      for additional TAC contact information, including localized telephone
      numbers, and instructions and e-mail addresses for use in various
      languages.
      
      Exploitation and Public Announcements
      =====================================
      
      The Cisco PSIRT is not aware of any public announcements or malicious
      use of the vulnerabilities described in this advisory.
      
      These vulnerabilities were discovered when handling customer support
      calls.
      
      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-20090325-webvpn.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-teams at 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-March-25 | 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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