[apops] Cisco Security Advisory: Cisco IOS Software Network Address Tran

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Software Network Address Translation Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 28 Mar 2012 12:20:57 -0400
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      Cisco Security Advisory: Cisco IOS Software Network Address Translation
      Vulnerability
      
      Advisory ID: cisco-sa-20120328-nat
      
      Revision 1.0
      
      For Public Release 2012 March 28 16:00  UTC (GMT)
      
      +--------------------------------------------------------------------
      
      Summary
      =======
      
      The Cisco IOS Software Network Address Translation (NAT) feature
      contains a denial of service (DoS) vulnerability in the translation of
      Session Initiation Protocol (SIP) packets.
      
      The vulnerability is caused when packets in transit on the vulnerable
      device require translation on the SIP payload.
      
      Cisco has released free software updates that address this
      vulnerability. A workaround that mitigates the vulnerability is
      available.
      
      This advisory is available at the following link:
      
      http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-nat
      
      
      Note: The March 28, 2012, Cisco IOS Software Security Advisory bundled
      publication includes nine Cisco Security Advisories. Each advisory
      lists the Cisco IOS Software releases that correct the vulnerability
      or vulnerabilities detailed in the advisory as well as the Cisco IOS
      Software releases that correct all vulnerabilities in the March 2012
      bundled publication.
      
      Individual publication links are in "Cisco Event Response: Semi-Annual
      Cisco IOS Software Security Advisory Bundled Publication" at the
      following link:
      
      http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar12.html
      
      
      Affected Products
      =================
      
      
      Vulnerable Products
      +------------------
      
      Cisco devices that are running Cisco IOS Software are vulnerable when
      they are configured for NAT and contain support for NAT for Session
      Initiation Protocol.
      
      There are two methods to determine if a device is configured for
      NAT: 
      
        * Determine if NAT is active on a running device.
        * Determine if NAT commands are included in the device
          configuration.
      
      Determine if NAT is Active on a Running Device
      +---------------------------------------------
      
      The preferred method to verify whether NAT is enabled on a Cisco IOS
      device is to log in to the device and issue the "show ip nat statistics"
      command. If NAT is active, the sections "Outside interfaces" and "Inside
      interfaces" will each include at least one interface. The following
      example shows a device on which the NAT feature is active:
      
          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
      
      Depending on the Cisco IOS Software release, the interface lists can be
      in the lines following the "Outside interfaces" and "Inside interfaces".
      In releases that support the "section" filter on "show" commands, the
      administrator can determine whether NAT is active by using the "show
      ip nat statistics | section interfaces" command, as illustrated in the
      following example:
      
          Router> show ip nat statistics | section interfaces
          Outside interfaces:
            GigabitEthernet0/0
          Inside interfaces:
            GigabitEthernet0/1
          Router>
      
      Determine if NAT Commands are Included in the Device Configuration
      +-----------------------------------------------------------------
      
      Alternatively, to determine whether NAT has been enabled in the Cisco
      IOS Software configuration, either the "ip nat inside" or "ip nat
      outside" commands must be present in different interfaces, or in the
      case of the NAT Virtual Interface, the "ip nat enable" interface command
      will be present.
      
      
      Determine the Cisco IOS Software Release
      +---------------------------------------
      
      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 15.0(1)M1 with an installed image name of
      C3900-UNIVERSALK9-M:
      
      Router> show version 
      Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
      Technical Support: http://www.cisco.com/techsupport
      Copyright (c) 1986-2009 by Cisco Systems, Inc.
      Compiled Wed 02-Dec-09 17:17 by prod_rel_team
      
      !--- output truncated 
      
      Additional information about Cisco IOS Software release naming
      conventions is available in "White Paper: Cisco IOS and NX-OS
      Software Reference Guide" at:
      
      http://www.cisco.com/web/about/security/intelligence/ios-ref.html
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      No other Cisco products are currently known to be affected by this
      vulnerability.
      
      Details
      =======
      
      Cisco IOS Software NAT SIP Memory Starvation Vulnerability
      
      NAT SIP application level gateway (ALG) translation of SIP packets could
      cause a memory resource exhaustion condition that can lead to a DoS
      condition, which could cause the reload of the vulnerable device.
      
      NAT for SIP is performed on UDP port 5060 packets by default. The
      port is configurable using the "ip nat service sip udp port" global
      configuration command.
      
      This vulnerability is documented in Cisco bug ID CSCti35326 and has been
      assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2012-0383.
      
      Vulnerability Scoring Details
      =============================
      
      Cisco has scored the vulnerability in this advisory based on the
      Common Vulnerability Scoring System (CVSS). The CVSS scoring in this
      security advisory is in accordance with CVSS version 2.0.
      
      CVSS is a standards-based scoring method that conveys vulnerability
      severity and helps organizations determine the urgency and priority
      of a response.
      
      Cisco has provided a base and temporal score. Customers can also
      compute environmental scores that help determine the impact of the
      vulnerability in their own networks.
      
      Cisco has provided additional information regarding CVSS at the
      following link:
      
      http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
      
      Cisco has also provided a CVSS calculator to compute the environmental
      impact for individual networks at the following link:
      
      http://intellishield.cisco.com/security/alertmanager/cvss
      
      
      * CSCti35326 ("Cisco IOS Software NAT SIP Memory Starvation 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
      
      
      Impact
      ======
      
      Successful exploitation of this vulnerability may cause incrementing
      use of memory that will not be released until the device is reloaded.
      This memory consumption could lead to a DoS condition and cause the
      vulnerable device to become unresponsive or reload.
      
      Software Versions and Fixes
      ===========================
      
      Cisco IOS Software
      
      Each row of the following Cisco IOS Software table corresponds to a
      Cisco IOS Software train. If a particular train is vulnerable, the
      earliest releases that contain the fix are listed in the First Fixed
      Release column. The First Fixed Release for All Advisories in the
      March 2012 Bundled Publication column lists the earliest possible
      releases that correct all the published vulnerabilities in the Cisco
      IOS Software Security Advisory bundled publication. Cisco recommends
      upgrading to the latest available release, where possible.
      
      The Cisco IOS Software Checker allows customers to search for Cisco
      Security Advisories that address specific Cisco IOS Software
      releases. This tool is available on the Cisco Security Intelligence
      Operations (SIO) portal at:
      
      http://tools.cisco.com/security/center/selectIOSVersion.x
      
      
      +------------------------------------------------------------+
      |  Major   |          Availability of Repaired Releases      |
      | Release  |                                                 |
      |----------+-------------------------------------------------|
      | Affected |                    |First Fixed Release for All |
      |12.0-Based|First Fixed Release |Advisories in the March 2012|
      | Releases |                    |Cisco IOS Software Security |
      |          |                    |Advisory Bundled Publication|
      |------------------------------------------------------------|
      |         There are no affected 12.0 based releases          |
      |------------------------------------------------------------|
      | Affected |                    |First Fixed Release for All |
      |12.2-Based|First Fixed Release |Advisories in the March 2012|
      | Releases |                    |Cisco IOS Software Security |
      |          |                    |Advisory Bundled Publication|
      |------------------------------------------------------------|
      |         There are no affected 12.2 based releases          |
      |------------------------------------------------------------|
      | Affected |                    |First Fixed Release for All |
      |12.3-Based|First Fixed Release |Advisories in the March 2012|
      | Releases |                    |Cisco IOS Software Security |
      |          |                    |Advisory Bundled Publication|
      |------------------------------------------------------------|
      |         There are no affected 12.3 based releases          |
      |------------------------------------------------------------|
      | Affected |                    |First Fixed Release for All |
      |12.4-Based|First Fixed Release |Advisories in the March 2012|
      | Releases |                    |Cisco IOS Software Security |
      |          |                    |Advisory Bundled Publication|
      |----------+--------------------+----------------------------|
      |12.4      |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |          |Releases up to and  |Vulnerable; contact your    |
      |          |including 12.4(24)  |support organization per the|
      |12.4GC    |GC3a are not        |instructions in Obtaining   |
      |          |vulnerable.         |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |12.4JA    |Not vulnerable      |12.4(23c)JA4                |
      |          |                    |12.4(25e)JA                 |
      |----------+--------------------+----------------------------|
      |12.4JAX   |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 12.4JA              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4JDA   |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4JDC   |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4JDD   |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4JDE   |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4JHA   |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4JHB   |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4JHC   |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4JK    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4JL    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |12.4JX    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 12.4JA              |
      |----------+--------------------+----------------------------|
      |12.4JY    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 12.4JA              |
      |----------+--------------------+----------------------------|
      |12.4JZ    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 12.4JA              |
      |----------+--------------------+----------------------------|
      |          |Only releases 12.4  |12.4(22)MD3; Available on   |
      |12.4MD    |(24)MD5 and 12.4(24)|30-MAR-12                   |
      |          |MD6 are vulnerable. |                            |
      |----------+--------------------+----------------------------|
      |          |Releases 12.4(24)   |                            |
      |          |MDA5 and prior are  |                            |
      |12.4MDA   |not vulnerable;     |12.4(24)MDA11               |
      |          |first fixed in 12.2 |                            |
      |          |(24)MDA11           |                            |
      |----------+--------------------+----------------------------|
      |12.4MDB   |12.4(24)MDB4        |12.4(24)MDB5a               |
      |----------+--------------------+----------------------------|
      |12.4MDC   |Not vulnerable      |Not vulnerable              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4MR    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4MRA   |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |12.4MRB   |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4SW    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |          |Only releases 12.4  |12.4(15)T17                 |
      |12.4T     |(24)T5 and 12.4(24) |12.4(24)T7                  |
      |          |T6 are vulnerable.  |                            |
      |----------+--------------------+----------------------------|
      |12.4XA    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4XB    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 12.4T               |
      |----------+--------------------+----------------------------|
      |12.4XC    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4XD    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4XE    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4XF    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4XG    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4XJ    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4XK    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4XL    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |12.4XM    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4XN    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4XP    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |12.4XQ    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4XR    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 12.4T               |
      |----------+--------------------+----------------------------|
      |12.4XT    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4XV    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |12.4XW    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4XY    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4XZ    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |12.4YA    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.0M               |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4YB    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |12.4YD    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |12.4YE    |Not vulnerable      |12.4(24)YE3d                |
      |----------+--------------------+----------------------------|
      |12.4YG    |Not vulnerable      |12.4(24)YG4                 |
      |----------+--------------------+----------------------------|
      | Affected |                    |First Fixed Release for All |
      |15.0-Based|First Fixed Release |Advisories in the March 2012|
      | Releases |                    |Cisco IOS Software Security |
      |          |                    |Advisory Bundled Publication|
      |----------+--------------------+----------------------------|
      |          |Only releases 15.0  |                            |
      |15.0M     |(1)M4 and 15.0(1)M5 |15.0(1)M8                   |
      |          |are vulnerable.     |                            |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |15.0MR    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |15.0MRA   |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |Not vulnerable      |                            |
      |          |Cisco IOS XE        |15.0(1)S5                   |
      |15.0S     |devices: Please see |Cisco IOS XE devices: Please|
      |          |Cisco IOS XE        |see Cisco IOS XE Software   |
      |          |Software            |Availability                |
      |          |Availability        |                            |
      |----------+--------------------+----------------------------|
      |15.0SA    |Not vulnerable      |Not vulnerable              |
      |----------+--------------------+----------------------------|
      |15.0SE    |Not vulnerable      |15.0(1)SE1                  |
      |----------+--------------------+----------------------------|
      |          |Not vulnerable      |                            |
      |          |Cisco IOS XE        |15.0(2)SG2                  |
      |15.0SG    |devices: Please see |Cisco IOS XE devices: Please|
      |          |Cisco IOS XE        |see Cisco IOS XE Software   |
      |          |Software            |Availability                |
      |          |Availability        |                            |
      |----------+--------------------+----------------------------|
      |15.0SY    |Not vulnerable      |15.0(1)SY1                  |
      |----------+--------------------+----------------------------|
      |15.0XA    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.1T               |
      |----------+--------------------+----------------------------|
      |          |Cisco IOS XE        |                            |
      |          |devices: Please see |Cisco IOS XE devices: Please|
      |15.0XO    |Cisco IOS-XE        |see Cisco IOS-XE Software   |
      |          |Software            |Availability                |
      |          |Availability        |                            |
      |----------+--------------------+----------------------------|
      | Affected |                    |First Fixed Release for All |
      |15.1-Based|First Fixed Release |Advisories in the March 2012|
      | Releases |                    |Cisco IOS Software Security |
      |          |                    |Advisory Bundled Publication|
      |----------+--------------------+----------------------------|
      |15.1EY    |Not vulnerable      |15.1(2)EY2                  |
      |----------+--------------------+----------------------------|
      |15.1GC    |Not vulnerable      |15.1(2)GC2                  |
      |----------+--------------------+----------------------------|
      |15.1M     |Not vulnerable      |15.1(4)M4; Available on     |
      |          |                    |30-MAR-12                   |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |15.1MR    |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |          |Not vulnerable      |                            |
      |          |Cisco IOS XE        |15.1(3)S2                   |
      |15.1S     |devices: Please see |Cisco IOS XE devices: Please|
      |          |Cisco IOS XE        |see Cisco IOS XE Software   |
      |          |Software            |Availability                |
      |          |Availability        |                            |
      |----------+--------------------+----------------------------|
      |          |Not vulnerable      |                            |
      |          |Cisco IOS XE        |Not vulnerable              |
      |15.1SG    |devices: Please see |Cisco IOS XE devices: Please|
      |          |Cisco IOS XE        |see Cisco IOS XE Software   |
      |          |Software            |Availability                |
      |          |Availability        |                            |
      |----------+--------------------+----------------------------|
      |          |                    |Vulnerable; contact your    |
      |          |                    |support organization per the|
      |15.1SNG   |Not vulnerable      |instructions in Obtaining   |
      |          |                    |Fixed Software section of   |
      |          |                    |this advisory.              |
      |----------+--------------------+----------------------------|
      |15.1SNH   |Not vulnerable      |Not vulnerable              |
      |----------+--------------------+----------------------------|
      |          |15.1(1)T4           |                            |
      |15.1T     |15.1(2)T5; Available|15.1(3)T3                   |
      |          |on 27-APR-12        |                            |
      |          |15.1(3)T            |                            |
      |----------+--------------------+----------------------------|
      |15.1XB    |Not vulnerable      |Vulnerable; First fixed in  |
      |          |                    |Release 15.1T               |
      |----------+--------------------+----------------------------|
      | Affected |                    |First Fixed Release for All |
      |15.2-Based|First Fixed Release |Advisories in the March 2012|
      | Releases |                    |Cisco IOS Software Security |
      |          |                    |Advisory Bundled Publication|
      |------------------------------------------------------------|
      |         There are no affected 15.2 based releases          |
      +------------------------------------------------------------+
      
      
      Cisco IOS XE Software
      +--------------------
      
      Cisco IOS XE Software is not affected by the vulnerability that is
      disclosed in this document.
      
      Cisco IOS XR Software
      +--------------------
      
      Cisco IOS XR Software is not affected by any of the vulnerabilities
      disclosed in the March 2012 Cisco IOS Software Security Advisory bundled
      publication.
      
      
      Workarounds
      ===========
      
      NAT for SIP Resource Exhaustion Vulnerability
      +--------------------------------------------
      
      This vulnerability can be mitigated by disabling NAT SIP ALG over the
      UDP transport by using the "no ip nat service sip udp port 5060" global
      configuration command. This command can only be configured in Cisco IOS
      images that include the NAT ALG SIP feature. Layer 3 NAT translation
      will continue to be performed on SIP packets but the SIP payload will
      not be translated.
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address the
      vulnerability|vulnerabilities described in this advisory. Prior to
      deploying software, customers are advised to consult their
      maintenance providers or check the software for feature set
      compatibility and known issues that are specific to their
      environments.
      
      Customers may only install and expect support for feature
      sets they have purchased. By installing, downloading,
      accessing, or otherwise using such software upgrades, customers
      agree to follow the terms of the Cisco software license at
      http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html,
      or as set forth 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, upgrades should be obtained
      through the Software Center on Cisco.com at http://www.cisco.com.
      
      Customers Using Third-Party Support Organizations
      +------------------------------------------------
      
      Customers with Cisco products that 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 organization for assistance with the appropriate
      course of action.
      
      The effectiveness of any workaround or fix depends on specific
      customer situations, such as product mix, network topology, traffic
      behavior, and organizational mission. Because of the variety of
      affected products and releases, customers should consult their
      service providers or support organizations to ensure that any applied
      workaround or fix is the most appropriate in the intended network
      before it is deployed.
      
      Customers Without Service Contracts
      +----------------------------------
      
      Customers who purchase directly from Cisco but do not hold a Cisco
      service contract and customers who make purchases through third-party
      vendors but are unsuccessful in obtaining fixed software through
      their point of sale should obtain upgrades by contacting the Cisco
      Technical Assistance Center (TAC):
      
        * +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 the product serial number available and be
      prepared to provide the URL of this advisory as evidence of
      entitlement to a free upgrade. Customers without service contracts
      should request free upgrades through the TAC.
      
      Refer to Cisco Worldwide Contacts at
      http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html
      for additional TAC contact information, including localized telephone
      numbers, instructions, and e-mail addresses for support in various
      languages.
      
      Exploitation and Public Announcements
      =====================================
      
      The Cisco Product Security Incident Response Team (PSIRT) is not
      aware of any public announcements or malicious use of the
      vulnerability that is described in this advisory.
      
      This vulnerability was found during troubleshooting of TAC 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 Security Intelligence Operations at
      the following link:
      
      http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-nat
      
      Additionally, a text version of this advisory is clear signed with
      the Cisco PSIRT PGP key and circulated among the following e-mail
      addresses:
      
        * 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
      
      Future updates of this advisory, if any, will reside on Cisco.com but
      may not be announced on mailing lists. Users can monitor this
      advisory's URL for any updates.
      
      
      Revision History
      ================
      
      +------------------------------------------------------------+
      | Revision 1.0  | 2012-March-28  | Initial public release.   |
      +------------------------------------------------------------+
      
      Cisco Security Procedures
      =========================
      
      Complete information about reporting security vulnerabilities in Cisco
      products, obtaining assistance with security incidents, and registering
      to receive security information from Cisco is available on Cisco.com at
      http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html.
      This web page includes instructions for press inquiries
      regarding Cisco Security Advisories. All Cisco Security Advisories are
      available at http://www.cisco.com/go/psirt.
      
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