[apops] Cisco Security Advisory: Cisco IOS NAT Skinny Call Control Proto

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS NAT Skinny Call Control Protocol Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 24 Sep 2008 17:50:00 +0200
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      Cisco Security Advisory: Cisco IOS NAT Skinny Call Control Protocol
      Vulnerability
      
      Advisory ID: cisco-sa-20080924-sccp
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml
      
      Revision 1.0
      
      For Public Release 2008 September 24 1600 UTC (GMT)
      
      - ---------------------------------------------------------------------
      
      Summary
      =======
      
      A series of segmented Skinny Call Control Protocol (SCCP) messages
      may cause a Cisco IOS device that is configured with the Network
      Address Translation (NAT) SCCP Fragmentation Support feature to
      reload.
      
      Cisco has released free software updates that address this
      vulnerability. A workaround that mitigates this vulnerability is
      available.
      
      This advisory is posted at 
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml
      
      Note: The September 24, 2008 IOS Advisory bundled publication
      includes twelve Security Advisories. Eleven of the advisories address
      vulnerabilities in Cisco's IOS software, and one advisory addresses
      vulnerabilities in Cisco Unified Communications Manager. Each
      Advisory lists the releases that correct the vulnerability described
      in the Advisory. Please reference the following software table to
      find a release that fixes all published IOS software Advisories as of
      September 24th, 2008:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-bundle.shtml
      
      Individual publication links are listed below:
      
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-cucm.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      This security advisory applies to all Cisco products that run Cisco
      IOS Software configured for NAT and that support the NAT SCCP
      Fragmentation Support feature. This feature was first introduced in
      Cisco IOS version 12.4(6)T.
      
      To verify if NAT is enabled on a Cisco IOS device log into the device
      and issue the command show ip nat statistics. The following example
      shows a device configured with NAT:
      
          Router# show ip nat statistics
      
          Total translations: 2 (0 static, 2 dynamic; 0 extended)
          Outside interfaces: Serial0
          Inside interfaces: Ethernet1
          Hits: 135  Misses: 5
          Expired translations: 2
          Dynamic mappings:
          -- Inside Source
          access-list 1 pool mypool refcount 2
           pool mypool: netmask 255.255.255.0
                  start 192.168.10.1 end 192.168.10.254
                  type generic, total addresses 14, allocated 2 (14%), misses 0
      
      Alternatively, you can use the show running-config | include ip nat
      command to verify if NAT has been enabled on the router interfaces.
      
      Note: With reference to NAT, the term "inside" refers to those
      networks that will be translated. Inside this domain, hosts will have
      addresses in one address space, while on the "outside", they will
      appear to have addresses in another address space when NAT is
      configured. The first address space is referred to as the local
      address space and the second is referred to as the global address
      space. The ip nat inside and ip nat outside interface commands must
      be present on the corresponding router interfaces in order for NAT to
      be enabled.
      
      In order to determine the software that runs on a Cisco IOS product,
      log in to the device and issue the show version command to display
      the system banner. Cisco IOS software identifies itself as
      "Internetwork Operating System Software" or simply "IOS." On the next
      line of output, the image name displays between parentheses, followed
      by "Version" and the Cisco IOS release name. Other Cisco devices do
      not have the show version command or give different output.
      
      The following example shows output from a device that runs an IOS
      image:
      
          router>show version
          Cisco IOS Software, 7200 Software (C7200-ADVSECURITYK9-M), Version 12.4(6)T2, RELEASE SOFTWARE (fc1)
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2006 by Cisco Systems, Inc.
          Compiled Tue 16-May-06 16:09 by kellythw
          <more output removed for brevity>
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco IOS XR and IOS XE are not affected by this vulnerability.
      
      Cisco IOS devices not explicitly configured for NAT are not
      vulnerable.
      
      No other Cisco products are currently known to be affected by these
      vulnerabilities.
      
      Details
      =======
      
      The Skinny Call Control Protocol (SCCP) enables voice communication
      between an SCCP client and a Call Manager (CM). Typically, the CM
      provides service to the SCCP clients on TCP Port 2000 by default.
      Initially, an SCCP client connects to the CM by establishing a TCP
      connection; the client will also establish a TCP connection with a
      secondary CM, if available.
      
      The NAT SCCP Fragmentation Support feature prevents skinny control
      message exchanges from failing in a TCP segmentation scenario because
      the NAT Skinny Application Layer Gateway (ALG) is able to reassemble
      the skinny control messages. A segmented payload that requires an IP
      or port translation will no longer be dropped. The NAT SCCP
      Fragmentation Support feature was introduced in Cisco IOS version
      12.4(6)T.
      
      A series of fragmented SCCP messages may cause a Cisco IOS router
      that is running the NAT SCCP Fragmentation Support feature to reload.
      
      This vulnerability is documented in Cisco Bug ID CSCsg22426 
      and CSCsi17020, and has been assigned CVE identifiers CVE-2008-3810
      and CVE-2008-3811.
      
      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
      
      CSCsg22426 - Cisco IOS Skinny Call Control Protocol (SCCP) Vulnerability
      
      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
      
      
      CSCsi17020 - Router may reload after NAT with certain skinny packets 
      
      CVSS Base Score - 7.8
      
              Access Vector          - Network
              Access Complexity      - Low
              Authentication         - None
              Confidentiality Impact - None
              Integrity Impact       - None
              Availability Impact    - Complete
      
      CVSS Temporal Score - 6.4
      
              Exploitability          - Functional
              Remediation Level       - Official-Fix
              Report Confidence       - Confirmed
      
      Impact
      ======
      
      Successful exploitation of this vulnerability may cause the affected
      device to reload. Repeated exploitation will result in a 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 Release   |         Availability of Repaired Releases     |
      |-------------------+-----------------------------------------------|
      |     Affected      |                       |                       |
      |    12.0-Based     |  First Fixed Release  |  Recommended Release  |
      |     Releases      |                       |                       |
      |-------------------------------------------------------------------|
      | There are no affected 12.0 based releases                         |
      |-------------------------------------------------------------------|
      |     Affected      |                       |                       |
      |    12.1-Based     |  First Fixed Release  |  Recommended Release  |
      |     Releases      |                       |                       |
      |-------------------------------------------------------------------|
      | There are no affected 12.1 based releases                         |
      |-------------------------------------------------------------------|
      |     Affected      |                       |                       |
      |    12.2-Based     |  First Fixed Release  |  Recommended 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        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2IRB           | 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        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2JA            | 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        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2SE            | 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        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2SRA           | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2SRB           | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2SRC           | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2SU            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2SV            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2SVA           | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2SVC           | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2SVD           | 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        |                       |
      |-------------------+-----------------------+-----------------------|
      |                   | Not Vulnerable        |                       |
      | 12.2SXH           |                       |                       |
      |                   | http://www.cisco.com/ |                       |
      |                   | go/pn                 |                       |
      |-------------------+-----------------------+-----------------------|
      | 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        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2XN            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2XNA           | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.2XNB           | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 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      |                       |                       |
      |    12.3-Based     |  First Fixed Release  |  Recommended Release  |
      |     Releases      |                       |                       |
      |-------------------------------------------------------------------|
      | There are no affected 12.3 based releases                         |
      |-------------------------------------------------------------------|
      |     Affected      |                       |                       |
      |    12.4-Based     |  First Fixed Release  |  Recommended Release  |
      |     Releases      |                       |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4              | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4JA            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4JK            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4JL            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4JMA           | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4JMB           | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4JMC           | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4JX            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4MD            | 12.4(11)MD4           | 12.4(15)MD1           |
      |-------------------+-----------------------+-----------------------|
      | 12.4MR            | 12.4(16)MR            | 12.4(19)MR            |
      |-------------------+-----------------------+-----------------------|
      |                   | 12.4(15)SW2;          | 12.4(15)SW2;          |
      | 12.4SW            | Available on          | Available on          |
      |                   | 28-SEP-08             | 28-SEP-08             |
      |-------------------+-----------------------+-----------------------|
      |                   | 12.4(11)T4            |                       |
      |                   |                       |                       |
      |                   | 12.4(15)T2            |                       |
      |                   |                       |                       |
      | 12.4T             | 12.4(20)T             | 12.4(15)T7            |
      |                   |                       |                       |
      |                   | 12.4(6)T11            |                       |
      |                   |                       |                       |
      |                   | 12.4(9)T5             |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XA            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XB            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XC            | Vulnerable; first     | 12.4(15)T7            |
      |                   | fixed in 12.4T        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XD            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XE            | Vulnerable; first     | 12.4(15)T7            |
      |                   | fixed in 12.4T        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XF            | Vulnerable; first     | 12.4(15)T7            |
      |                   | fixed in 12.4T        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XG            | 12.4(9)XG3            | 12.4(9)XG3            |
      |-------------------+-----------------------+-----------------------|
      | 12.4XJ            | Vulnerable; first     | 12.4(15)T7            |
      |                   | fixed in 12.4T        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XK            | Vulnerable; first     | 12.4(15)T7            |
      |                   | fixed in 12.4T        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XL            | 12.4(15)XL2           | 12.4(15)XL2           |
      |-------------------+-----------------------+-----------------------|
      | 12.4XM            | 12.4(15)XM1           | 12.4(15)XM1           |
      |-------------------+-----------------------+-----------------------|
      | 12.4XN            | Vulnerable; contact   |                       |
      |                   | TAC                   |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XP            | Vulnerable; contact   |                       |
      |                   | TAC                   |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XQ            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XR            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XT            | Vulnerable; first     | 12.4(15)T7            |
      |                   | fixed in 12.4T        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XV            | Vulnerable; contact   |                       |
      |                   | TAC                   |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XW            | 12.4(11)XW7           | 12.4(11)XW9           |
      |-------------------+-----------------------+-----------------------|
      | 12.4XY            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4XZ            | Not Vulnerable        |                       |
      |-------------------+-----------------------+-----------------------|
      | 12.4YA            | Not Vulnerable        |                       |
      +-------------------------------------------------------------------+
      
      Workarounds
      ===========
      
      As workaround, an administrator can disable SCCP NAT support using
      the no ip nat service skinny tcp port 2000 command, as shown in the
      following example:
      
          Router(config)# no ip nat service skinny tcp port 2000
      
      Note: If your Cisco CallManager is using a TCP port for skinny
      signaling different from the default port (2000), you need to adjust
      this command accordingly.
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address these
      vulnerabilities. Prior to deploying software, customers should
      consult their maintenance provider or check the software for feature
      set compatibility and known issues specific to their environment.
      
      Customers may only install and expect support for the feature sets
      they have purchased. By installing, downloading, accessing or
      otherwise using such software upgrades, customers agree to be bound
      by the terms of Cisco's software license terms found at 
      http://www.cisco.com/en/US/products/prod_warranties_item09186a008088e31f.html
      or as otherwise set forth at Cisco.com Downloads at 
      http://www.cisco.com/public/sw-center/sw-usingswc.shtml
      
      Do not contact psirt 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 vulnerability described in this advisory.
      
      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-20080924-sccp.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      | 2008-September-24 | 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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