Cisco IOS Software Network Address Translation Vulnerabilities

Summary

• The Cisco IOS Software Network Address Translation (NAT) feature contains two denial of service (DoS) vulnerabilities in the translation of IP packets.
  
  The vulnerabilities are caused when packets in transit on the vulnerable device require translation.
  
  Cisco has released software updates that address these vulnerabilities. This advisory is available at the following link:
  http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-nat
  
  

  Note: The September 26, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Eight of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses a vulnerability in Cisco Unified Communications Manager. Each Cisco IOS Software Security 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 Cisco IOS Software vulnerabilities in the September 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_sep12.html

Affected Products

• 
  

  Vulnerable Products

  Cisco devices that are running Cisco IOS Software are vulnerable when they are configured for NAT. One of the vulnerabilities requires support for NAT for Session Initiation Protocol (SIP) to be present in the release.
  There are two methods to determine whether a device is configured for NAT:

  • Determine whether NAT is active on a running device.
  • Determine whether NAT commands are included in the device configuration.

  Determine Whether 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 Whether 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. The show configuration | include ip nat command can be used to determine whether NAT is present in the configuration, as illustrated in the following examples:

  Router> show configuration | include ip nat 
   ip nat inside
   ip nat outside
  Router>

  Router> show configuration | include ip nat 
   ip nat enable
  Router>

  
  

  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 these vulnerabilities.

Details

• Cisco IOS Software NAT for SIP Denial of Service Vulnerability

  
  The NAT SIP application layer gateway (ALG) feature adds the ability to deploy Cisco IOS NAT between VoIP solutions based on SIP by translating IP addresses that are embedded in the SIP payload of IP packets.
  Cisco IOS Software contains a vulnerability in the NAT processing of SIP packets. This vulnerability is present when the NAT SIP ALG feature is enabled.
  
  NAT SIP ALG is enabled by default, and performs the SIP payload translation of IP packets. NAT SIP translation is done 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 CSCtn76183 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2012-4618
  
  

  Cisco IOS Software NAT Denial of Service Vulnerability

  The IP NAT feature permits interconnection of networks when the IP addresses of packets that are moving between the networks need to be translated to be valid in the destination network.
  Cisco IOS Software contains a vulnerability in the NAT processing of IP packets. Exploitation of the vulnerability will cause a DoS condition.
  
  
  
  This vulnerability is documented in Cisco bug ID CSCtr46123 (registered customers only) and has been assigned CVE ID CVE-2012-4619

Workarounds

• Cisco IOS Software NAT for SIP Denial of Service Vulnerability

  This vulnerability can be mitigated by disabling NAT SIP ALG over UDP transport by using the no ip nat service sip udp port 5060 global configuration command. This command can be configured only 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.
  

  Cisco IOS Software NAT Denial of Service Vulnerability

  There are no workarounds for this vulnerability.

Fixed Software

• 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 September 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 (SIO) portal at http://tools.cisco.com/security/center/selectIOSVersion.x

  
  
  

  Major Release	Availability of Repaired Releases
  Affected 12.0-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  There are no affected 12.0-based releases
  Affected 12.2-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  12.2	Not vulnerable	Not vulnerable
  12.2B	Not vulnerable	Vulnerable; First fixed in Release 12.4 Releases up to and including 12.2(4)B8 are not vulnerable.
  12.2BC	Not vulnerable	Not vulnerable
  12.2BW	Not vulnerable	Not vulnerable
  12.2BX	Not vulnerable	12.2(15)BX Releases up to and including 12.2(2)BX1 are not vulnerable.
  12.2BY	Not vulnerable	Not vulnerable
  12.2BZ	Not vulnerable	Not vulnerable
  12.2CX	Not vulnerable	Not vulnerable
  12.2CY	Not vulnerable	Not vulnerable
  12.2CZ	Not vulnerable	Vulnerable; migrate to any release in 12.2S
  12.2DA	Not vulnerable	Not vulnerable
  12.2DD	Not vulnerable	Not vulnerable
  12.2DX	Not vulnerable	Not vulnerable
  12.2EU	Not vulnerable	Not vulnerable
  12.2EW	Not vulnerable	Not vulnerable
  12.2EWA	Not vulnerable	Not vulnerable
  12.2EX	Not vulnerable	Vulnerable; First fixed in Release 15.0SE Releases up to and including 12.2(37)EX are not vulnerable.
  12.2EY	Not vulnerable	Vulnerable; First fixed in Release 15.1EY Releases up to and including 12.2(46)EY are not vulnerable.
  12.2EZ	Not vulnerable	Not vulnerable
  12.2FX	Not vulnerable	Not vulnerable
  12.2FY	Not vulnerable	Not vulnerable
  12.2FZ	Not vulnerable	Not vulnerable
  12.2IRA	Not vulnerable	Vulnerable; First fixed in Release 12.2SRE
  12.2IRB	Not vulnerable	Vulnerable; First fixed in Release 12.2SRE
  12.2IRC	Not vulnerable	Vulnerable; First fixed in Release 12.2SRE
  12.2IRD	Not vulnerable	Vulnerable; First fixed in Release 12.2SRE
  12.2IRE	Not vulnerable	Vulnerable; First fixed in Release 12.2SRE
  12.2IRF	Not vulnerable	Vulnerable; First fixed in Release 12.2SRE
  12.2IRG	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.2IRH	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.2IRI	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.2IXA	Not vulnerable	Not vulnerable
  12.2IXB	Not vulnerable	Not vulnerable
  12.2IXC	Not vulnerable	Not vulnerable
  12.2IXD	Not vulnerable	Not vulnerable
  12.2IXE	Not vulnerable	Not vulnerable
  12.2IXF	Not vulnerable	Not vulnerable
  12.2IXG	Not vulnerable	Not vulnerable
  12.2IXH	Not vulnerable	Not vulnerable
  12.2JA	Not vulnerable	Not vulnerable
  12.2JK	Not vulnerable	Not vulnerable
  12.2MB	Not vulnerable	Not vulnerable
  12.2MC	Not vulnerable	Releases up to and including 12.2(15)MC1 are not vulnerable. Releases 12.2(15)MC2b and later are not vulnerable. First fixed in Release 12.4
  12.2MRA	Not vulnerable	Vulnerable; First fixed in Release 12.2SRE
  12.2MRB	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.2S	Not vulnerable	Not vulnerable
  12.2SB	Not vulnerable	12.2(33)SB13
  12.2SBC	Not vulnerable	Vulnerable; First fixed in Release 12.2SB
  12.2SCA	Not vulnerable	Vulnerable; First fixed in Release 12.2SCF
  12.2SCB	Not vulnerable	Vulnerable; First fixed in Release 12.2SCF
  12.2SCC	Not vulnerable	Vulnerable; First fixed in Release 12.2SCF
  12.2SCD	Not vulnerable	Vulnerable; First fixed in Release 12.2SCF
  12.2SCE	Not vulnerable	Vulnerable; First fixed in Release 12.2SCF
  12.2SCF	Not vulnerable	12.2(33)SCF4
  12.2SCG	Not vulnerable	Not vulnerable
  12.2SE	Not vulnerable	12.2(46)SE1 12.2(55)SE6
  12.2SEA	Not vulnerable	Not vulnerable
  12.2SEB	Not vulnerable	Not vulnerable
  12.2SEC	Not vulnerable	Not vulnerable
  12.2SED	Not vulnerable	Not vulnerable
  12.2SEE	Not vulnerable	Not vulnerable
  12.2SEF	Not vulnerable	Not vulnerable
  12.2SEG	Not vulnerable	Not vulnerable
  12.2SG	Not vulnerable	12.2(53)SG8 Vulnerable; releases up to and including 12.2(46)SG1 are not vulnerable.
  12.2SGA	Not vulnerable	Not vulnerable
  12.2SM	Not vulnerable	Not vulnerable
  12.2SO	Not vulnerable	Not vulnerable
  12.2SQ	Not vulnerable	Releases up to and including 12.2(44)SQ2 are not vulnerable.
  12.2SRA	Not vulnerable	Not vulnerable
  12.2SRB	Not vulnerable	Not vulnerable
  12.2SRC	Not vulnerable	Vulnerable; First fixed in Release 12.2SRE
  12.2SRD	Not vulnerable	Vulnerable; First fixed in Release 12.2SRE
  12.2SRE	Not vulnerable	12.2(33)SRE7
  12.2STE	Not vulnerable	Not vulnerable
  12.2SU	Not vulnerable	Not vulnerable
  12.2SV	Not vulnerable	Not vulnerable
  12.2SVA	Not vulnerable	Not vulnerable
  12.2SVC	Not vulnerable	Not vulnerable
  12.2SVD	Not vulnerable	Not vulnerable
  12.2SVE	Not vulnerable	Not vulnerable
  12.2SW	Not vulnerable	Not vulnerable
  12.2SX	Not vulnerable	Not vulnerable
  12.2SXA	Not vulnerable	Not vulnerable
  12.2SXB	Not vulnerable	Not vulnerable
  12.2SXD	Not vulnerable	Not vulnerable
  12.2SXE	Not vulnerable	Not vulnerable
  12.2SXF	Not vulnerable	Not vulnerable
  12.2SXH	Vulnerable; releases up to and including 12.2(33)SXH7 are not vulnerable.	Vulnerable; releases up to and including 12.2(33)SXH7 are not vulnerable.
  12.2SXI	12.2(33)SXI7 Not vulnerable up to 12.2(33)SXI4b	12.2(33)SXI10
  12.2SXJ	12.2(33)SXJ1	12.2(33)SXJ4
  12.2SY	12.2(50)SY3 Vulnerable Only From 12.2(50)SY through 12.2(50)SY2	12.2(50)SY3
  12.2SZ	Not vulnerable	Not vulnerable
  12.2T	Not vulnerable	Vulnerable; First fixed in Release 12.4 Releases up to and including 12.2(8)T10 are not vulnerable.
  12.2TPC	Not vulnerable	Not vulnerable
  12.2WO	Not vulnerable	Vulnerable; First fixed in Release 15.0SG
  12.2XA	Not vulnerable	Not vulnerable
  12.2XB	Not vulnerable	Not vulnerable
  12.2XC	Not vulnerable	Not vulnerable
  12.2XD	Not vulnerable	Not vulnerable
  12.2XE	Not vulnerable	Not vulnerable
  12.2XF	Not vulnerable	Not vulnerable
  12.2XG	Not vulnerable	Not vulnerable
  12.2XH	Not vulnerable	Not vulnerable
  12.2XI	Not vulnerable	Not vulnerable
  12.2XJ	Not vulnerable	Not vulnerable
  12.2XK	Not vulnerable	Not vulnerable
  12.2XL	Not vulnerable	Not vulnerable
  12.2XM	Not vulnerable	Not vulnerable
  12.2XNA	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNB	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNC	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XND	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNE	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNF	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XO	Not vulnerable	Vulnerable; First fixed in Release 12.2SG Releases up to and including 12.2(40)XO are not vulnerable.
  12.2XQ	Not vulnerable	Not vulnerable
  12.2XR	Not vulnerable	Not vulnerable
  12.2XS	Not vulnerable	Not vulnerable
  12.2XT	Not vulnerable	Not vulnerable
  12.2XU	Not vulnerable	Not vulnerable
  12.2XV	Not vulnerable	Not vulnerable
  12.2XW	Not vulnerable	Not vulnerable
  12.2YA	Not vulnerable	Not vulnerable
  12.2YC	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.2YD	Not vulnerable	Not vulnerable
  12.2YE	Not vulnerable	Not vulnerable
  12.2YK	Not vulnerable	Not vulnerable
  12.2YO	Not vulnerable	Not vulnerable
  12.2YP	Not vulnerable	Not vulnerable
  12.2YT	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.2YW	Not vulnerable	Not vulnerable
  12.2YX	Not vulnerable	Not vulnerable
  12.2YY	Not vulnerable	Not vulnerable
  12.2YZ	Not vulnerable	Not vulnerable
  12.2ZA	Not vulnerable	Not vulnerable
  12.2ZB	Not vulnerable	Not vulnerable
  12.2ZC	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.2ZD	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.2ZE	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.2ZH	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.2ZJ	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.2ZP	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.2ZU	Not vulnerable	Not vulnerable
  12.2ZX	Not vulnerable	Vulnerable; First fixed in Release 12.2SB
  12.2ZY	Not vulnerable	Not vulnerable
  12.2ZYA	Not vulnerable	Not vulnerable
  Affected 12.3-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  There are no affected 12.3-based releases
  Affected 12.4-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  12.4	12.4(25g) Vulnerable Only From 12.4(23a) thru 12.4(25f)	12.4(25g)
  12.4GC	Releases up to and including 12.4(22)GC1 are not vulnerable.	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.4JA	Not vulnerable	Not vulnerable
  12.4JAL	Not vulnerable	Not vulnerable
  12.4JAX	Not vulnerable	Not vulnerable
  12.4JAY	Not vulnerable	Not vulnerable
  12.4JDA	Not vulnerable	Not vulnerable
  12.4JDC	Not vulnerable	Not vulnerable
  12.4JDD	Not vulnerable	Not vulnerable
  12.4JDE	Not vulnerable	Not vulnerable
  12.4JHA	Not vulnerable	Not vulnerable
  12.4JHB	Not vulnerable	Not vulnerable
  12.4JHC	Not vulnerable	Not vulnerable
  12.4JK	Not vulnerable	Not vulnerable
  12.4JL	Not vulnerable	Not vulnerable
  12.4JX	Not vulnerable	Not vulnerable
  12.4JY	Not vulnerable	Not vulnerable
  12.4JZ	Not vulnerable	Not vulnerable
  12.4MD	12.4(24)MD7	12.4(24)MD7
  12.4MDA	Vulnerable; only releases 12.4(24)MDA1 through 12.4(24)MDA10 are vulnerable.	Vulnerable; releases up to and including 12.4(22)MDA6 are not vulnerable.
  12.4MDB	12.4(24)MDB10	12.4(24)MDB10
  12.4MR	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.4MRA	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.4MRB	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4SW	Not vulnerable	Not vulnerable
  12.4T	Vulnerable; only releases 12.4(15)T13 through 12.4(24)T6 are vulnerable.	12.4(24)T8
  12.4XA	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XB	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XC	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XD	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XE	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XF	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XG	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XJ	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XK	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XL	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.4XM	Not vulnerable	Releases up to and including 12.4(15)XM are not vulnerable. Releases 12.4(15)XM3 and later are not vulnerable. First fixed in Release 12.4T
  12.4XN	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.4XP	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.4XQ	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XR	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XT	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XV	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.4XW	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XY	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4XZ	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4YA	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.4YB	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.4YD	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  12.4YE	Vulnerable; First fixed in Release 12.4T Releases up to and including 12.4(22)YE6 are not vulnerable.	Vulnerable; First fixed in Release 12.4T
  12.4YG	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  Affected 15.0-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  15.0EX	Not vulnerable	Not vulnerable
  15.0EY	Not vulnerable	Not vulnerable
  15.0M	15.0(1)M8	15.0(1)M9
  15.0MR	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  15.0MRA	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  15.0S	Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.0(1)S6 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0SE	Not vulnerable	15.0(2)SE
  15.0SG	Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.0(2)SG5 15.0(2)SG6; Available on 11-OCT-12 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0SY	Not vulnerable	15.0(1)SY2
  15.0XA	Vulnerable; First fixed in Release 15.1T	Vulnerable; First fixed in Release 15.1M
  15.0XO	Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability	Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability
  Affected 15.1-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  15.1EY	Not vulnerable	15.1(2)EY4
  15.1GC	15.1(2)GC2	Vulnerable; First fixed in Release 15.1M
  15.1M	15.1(4)M3	15.1(4)M5
  15.1MR	Not vulnerable	15.1(3)MR; Available on 01-OCT-12
  15.1S	Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.1(3)S Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.1SG	Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.1(1)SG1 15.1(2)SG 12-NOV-12 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.1SNG	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  15.1SNH	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  15.1SNI	Not vulnerable	Vulnerable; migrate to any release in 15.2SNG
  15.1SV	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
  15.1T	15.1(2)T5 15.1(3)T3	Vulnerable; First fixed in Release 15.1M
  15.1XB	Vulnerable; First fixed in Release 15.1T	Vulnerable; First fixed in Release 15.1M
  Affected 15.2-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  15.2GC	15.2(2)GC	Releases prior to 15.2(3)GC are vulnerable; Releases 15.2(3)GC and later are not vulnerable. First fixed in Release 15.2T
  15.2JA	Not vulnerable	Not Vulnerable
  15.2M	Not vulnerable	Not vulnerable
  15.2S	Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.2(1)S2 15.2(2)S1 15.2(4)S Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.2SNG	Not vulnerable	Not vulnerable
  15.2T	15.2(1)T3 15.2(2)T1 15.2(3)T	15.2(1)T3 15.2(2)T2 15.2(3)T2; Available on 12-OCT-12

  
  

  Cisco IOS XE Software

  Cisco IOS XE Software is not affected by the vulnerabilities that are disclosed in this document.

  Cisco IOS XR Software

  Cisco IOS XR Software is not affected by the vulnerabilities that are disclosed in this document.
  

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.

  The vulnerabilities were found during troubleshooting of TAC service requests.

URL

• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-nat

Revision History

• Revision 1.0

  2012-September-26

  Initial public release.

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