[apops] Cisco Security Advisory: Cisco IOS Software NAT Skinny Call Cont

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Software NAT Skinny Call Control Protocol Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 24 Mar 2010 12:00:00 -0400
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      Cisco Security Advisory: Cisco IOS Software NAT Skinny Call Control
      Protocol Vulnerability
      
      Advisory ID: cisco-sa-20100324-sccp
      
      Revision 1.0
      
      For Public Release 2010 March 24 1600 UTC (GMT)
      
      +---------------------------------------------------------------------
      
      Summary
      =======
      
      Skinny Client Control Protocol (SCCP) crafted 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-20100324-sccp.shtml
      
      Note: The March 24, 2010, Cisco IOS Software Security Advisory
      bundled publication includes seven Security Advisories. All the
      advisories address vulnerabilities in Cisco IOS Software. Each
      advisory lists the releases that correct the vulnerability or
      vulnerabilities detailed in the advisory. The table at the following
      URL lists releases that correct all Cisco IOS Software
      vulnerabilities that have been published on March 24, 2010, or
      earlier:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20100324-bundle.shtml
      
      Individual publication links are in "Cisco Event Response: Semiannual
      Cisco IOS Software Security Advisory Bundled Publication" at the
      following link:
      
      http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar10.html
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      This security advisory applies to all Cisco products that run Cisco
      IOS Software configured for Network Address Translation (NAT) and
      that support the NAT SCCP Fragmentation Support feature. This feature
      was first introduced in Cisco IOS Software Release 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
      
      You can also use the "show running-config | include ip nat" command to
      verify if NAT has been enabled on the device.
      
      In NAT traditional configurations, 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.
      
      The NAT Virtual Interface (NVI) feature removes the requirement to
      configure an interface as either NAT inside or NAT outside. If the
      device is configured for NVI, you can use the show ip nat nvi
      statistics command in user EXEC or privileged EXEC mode, as shown in
      the following example.
      
          Router# show ip nat nvi statistics
          
          Total active translations: 0 (0 static, 0 dynamic; 0 extended) NAT Enabled interfaces:
          Hits: 0  Misses: 0
          CEF Translated packets: 0, CEF Punted packets: 0 Expired translations: 0 Dynamic mappings:
          -- Inside Source
          [Id: 1] access-list 1 pool pool1 refcount 1213 pool pool1: netmask 255.255.255.0
                   start 192.168.1.10 end 192.168.1.253
                   start 192.168.2.10 end 192.168.2.253
                   start 192.168.3.10 end 192.168.3.253
                   start 192.168.4.10 end 192.168.4.253
                   type generic, total addresses 976, allocated 222 (22%), misses 0  
          
          !---output truncated
          
      In order to determine the software that is running 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.
      
          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
          
          !---output truncated
          
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco IOS XR Software and IOS XE Software 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 this
      vulnerability.
      
      Details
      =======
      
      The Skinny Client 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 enables the Skinny
      Application Layer Gateway (ALG) to reassemble skinny control
      messages. Since this feature was introduced in Cisco IOS version 12.4
      (6)T, SCCP payloads requiring reassembly and NAT are no longer
      dropped.
      
      A series of crafted SCCP packets 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 CSCsy09250 and has
      been assigned the CVE ID CVE-2010-0584.
      
      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
      
      CSCsy09250 - Bus error and crash when crafted packet is sent to 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 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 "Bundle First
      Fixed Release" column indicates the earliest possible releases which
      have fixes for all the published vulnerabilities in this Cisco IOS
      Security Advisory bundled publication. Cisco recommends upgrading to
      the latest available release where possible.
      
      +--------------------------------------------------------------------+
      |   Major    |           Availability of Repaired Releases           |
      |  Release   |                                                       |
      |------------+-------------------------------------------------------|
      |  Affected  |                           |  First Fixed Release for  |
      | 12.0-Based |  First Fixed Release for  |   all Advisories in 24    |
      |  Releases  |       this Advisory       |     March 2010 Bundle     |
      |            |                           |        Publication        |
      |--------------------------------------------------------------------|
      | There are no affected 12.0 based releases                          |
      |--------------------------------------------------------------------|
      |  Affected  |                           |  First Fixed Release for  |
      | 12.1-Based |  First Fixed Release for  |   all Advisories in 24    |
      |  Releases  |       this Advisory       |     March 2010 Bundle     |
      |            |                           |        Publication        |
      |--------------------------------------------------------------------|
      | There are no affected 12.1 based releases                          |
      |--------------------------------------------------------------------|
      |  Affected  |                           |  First Fixed Release for  |
      | 12.2-Based |  First Fixed Release for  |   all Advisories in 24    |
      |  Releases  |       this Advisory       |     March 2010 Bundle     |
      |            |                           |        Publication        |
      |--------------------------------------------------------------------|
      | There are no affected 12.2 based releases                          |
      |--------------------------------------------------------------------|
      |  Affected  |                           |  First Fixed Release for  |
      | 12.3-Based |  First Fixed Release for  |   all Advisories in 24    |
      |  Releases  |       this Advisory       |     March 2010 Bundle     |
      |            |                           |        Publication        |
      |--------------------------------------------------------------------|
      | There are no affected 12.3 based releases                          |
      |--------------------------------------------------------------------|
      |  Affected  |                           |  First Fixed Release for  |
      | 12.4-Based |  First Fixed Release for  |   all Advisories in 24    |
      |  Releases  |       this Advisory       |     March 2010 Bundle     |
      |            |                           |        Publication        |
      |------------+---------------------------+---------------------------|
      |            |                           | 12.4(25c)                 |
      | 12.4       | Not Vulnerable            |                           |
      |            |                           | 15.0(1)M1                 |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your  |
      |            | support organization per  | support organization per  |
      | 12.4GC     | the instructions in       | the instructions in       |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software  |
      |            | section of this advisory  | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            |                           | Vulnerable; Contact your  |
      |            |                           | support organization per  |
      | 12.4JA     | Not Vulnerable            | the instructions in       |
      |            |                           | Obtaining Fixed Software  |
      |            |                           | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            |                           | Vulnerable; Contact your  |
      |            |                           | support organization per  |
      | 12.4JDA    | Not Vulnerable            | the instructions in       |
      |            |                           | Obtaining Fixed Software  |
      |            |                           | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            |                           | Vulnerable; Contact your  |
      |            |                           | support organization per  |
      | 12.4JDC    | Not Vulnerable            | the instructions in       |
      |            |                           | Obtaining Fixed Software  |
      |            |                           | section of this advisory  |
      |------------+---------------------------+---------------------------|
      | 12.4JDD    | Not Vulnerable            | 12.4(10b)JDD1             |
      |------------+---------------------------+---------------------------|
      | 12.4JHA    | Not Vulnerable            | Not Vulnerable            |
      |------------+---------------------------+---------------------------|
      |            |                           | Vulnerable; Contact your  |
      |            |                           | support organization per  |
      | 12.4JK     | Not Vulnerable            | the instructions in       |
      |            |                           | Obtaining Fixed Software  |
      |            |                           | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            |                           | Vulnerable; Contact your  |
      |            |                           | support organization per  |
      | 12.4JL     | Not Vulnerable            | the instructions in       |
      |            |                           | Obtaining Fixed Software  |
      |            |                           | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            |                           | Releases prior to 12.4    |
      | 12.4JMA    | Not Vulnerable            | (3g)JMA2 are vulnerable,  |
      |            |                           | release 12.4(3g)JMA2 and  |
      |            |                           | later are not vulnerable  |
      |------------+---------------------------+---------------------------|
      |            |                           | Vulnerable; Contact your  |
      |            |                           | support organization per  |
      | 12.4JMB    | Not Vulnerable            | the instructions in       |
      |            |                           | Obtaining Fixed Software  |
      |            |                           | section of this advisory  |
      |------------+---------------------------+---------------------------|
      | 12.4JX     | Not Vulnerable            | Vulnerable; first fixed   |
      |            |                           | in 12.4JA                 |
      |------------+---------------------------+---------------------------|
      | 12.4MD     | 12.4(11)MD10              | 12.4(24)MD                |
      |------------+---------------------------+---------------------------|
      | 12.4MDA    | 12.4(22)MDA2              | 12.4(22)MDA2              |
      |------------+---------------------------+---------------------------|
      |            |                           | Vulnerable; Contact your  |
      |            | Releases up to and        | support organization per  |
      | 12.4MR     | including 12.4(4)MR1 are  | the instructions in       |
      |            | not vulnerable.           | Obtaining Fixed Software  |
      |            |                           | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4SW     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | 12.4(20)T4                | 12.4(15)T12               |
      |            |                           |                           |
      |            | 12.4(22)T3                | 12.4(20)T5                |
      | 12.4T      |                           |                           |
      |            | 12.4(15)T10               | 12.4(24)T3; Available on  |
      |            |                           | 26-MAR-10                 |
      |            | 12.4(24)T2                |                           |
      |            |                           | 12.4(22)T4                |
      |------------+---------------------------+---------------------------|
      |            |                           | Vulnerable; migrate to    |
      | 12.4XA     | Not Vulnerable            | any release in 15.0M or a |
      |            |                           | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            |                           | Vulnerable; migrate to    |
      | 12.4XB     | Not Vulnerable            | any release in 15.0M or a |
      |            |                           | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XC     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            |                           | Vulnerable; migrate to    |
      | 12.4XD     | Not Vulnerable            | any release in 15.0M or a |
      |            |                           | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XE     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XF     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XG     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XJ     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XK     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your  |
      |            | support organization per  | support organization per  |
      | 12.4XL     | the instructions in       | the instructions in       |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software  |
      |            | section of this advisory  | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XM     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your  |
      |            | support organization per  | support organization per  |
      | 12.4XN     | the instructions in       | the instructions in       |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software  |
      |            | section of this advisory  | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your  |
      |            | support organization per  | support organization per  |
      | 12.4XP     | the instructions in       | the instructions in       |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software  |
      |            | section of this advisory  | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XQ     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      | 12.4XR     | 12.4(22)XR3               | 12.4(22)XR3               |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XT     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your  |
      |            | support organization per  | support organization per  |
      | 12.4XV     | the instructions in       | the instructions in       |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software  |
      |            | section of this advisory  | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XW     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XY     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4XZ     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to    |
      | 12.4YA     | any release in 15.0M or a | any release in 15.0M or a |
      |            | fixed 12.4T release.      | fixed 12.4 release.       |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your  |
      |            | support organization per  | support organization per  |
      | 12.4YB     | the instructions in       | the instructions in       |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software  |
      |            | section of this advisory  | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your  |
      |            | support organization per  | support organization per  |
      | 12.4YD     | the instructions in       | the instructions in       |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software  |
      |            | section of this advisory  | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |            |                           | 12.4(22)YE2               |
      | 12.4YE     | 12.4(22)YE2               |                           |
      |            |                           | 12.4(24)YE                |
      |------------+---------------------------+---------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your  |
      |            | support organization per  | support organization per  |
      | 12.4YG     | the instructions in       | the instructions in       |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software  |
      |            | section of this advisory  | section of this advisory  |
      |------------+---------------------------+---------------------------|
      |  Affected  |                           |  First Fixed Release for  |
      | 15.0-Based |  First Fixed Release for  |   all Advisories in 24    |
      |  Releases  |       this Advisory       |     March 2010 Bundle     |
      |            |                           |        Publication        |
      |--------------------------------------------------------------------|
      | There are no affected 15.0 based releases                          |
      |--------------------------------------------------------------------|
      |  Affected  |                           |  First Fixed Release for  |
      | 15.1-Based |  First Fixed Release for  |   all Advisories in 24    |
      |  Releases  |       this Advisory       |     March 2010 Bundle     |
      |            |                           |        Publication        |
      |--------------------------------------------------------------------|
      | There are no affected 15.1 based releases                          |
      +--------------------------------------------------------------------+
      
      Cisco IOS-XE Software
      +--------------------
      
      +-------------------------------------------------------------------+
      |       IOS-XE Release       |         First Fixed Release          |
      |----------------------------+--------------------------------------|
      | 2.1.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.2.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.3.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.4.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.5.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.6.x                      | 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.
      
      Caution: This workaround is only feasible on networks where
      SCCP traffic does not need to be processed by NAT. Please confirm
      before implementing this workaround.
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address this
      vulnerability. 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 the resolution of customer service
      requests.
      
      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-20100324-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-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 1.0    | 2010-March-24    | Initial public release       |
      +-------------------------------------------------------------------+
      
      Cisco Security Procedures
      =========================
      
      Complete information on reporting security vulnerabilities in Cisco
      products, obtaining assistance with security incidents, and
      registering to receive security information from Cisco, is available
      on Cisco's worldwide website at:
      
      http://www.cisco.com/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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