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Cisco IOS Software Network Address Translation Vulnerabilities

Advisory ID: cisco-sa-20120926-nat

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

Revision 1.0

For Public Release 2012 September 26 16:00  UTC (GMT)


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 free 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

Vulnerability Scoring Details

Cisco has scored the vulnerabilities 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



CSCtn76183 Cisco IOS Software NAT for SIP Denial of Service Vulnerability

Calculate the environmental score of CSCtn76183

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed



CSCtr46123 Cisco IOS Software NAT Denial of Service Vulnerability

Calculate the environmental score of CSCtr46123

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of the vulnerabilities that are described in this advisory may cause a reload of an affected device. Repeated exploitation could result in a sustained DoS condition.

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 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.

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.

Obtaining Fixed Software

Cisco has released free software updates that address the vulnerability 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.

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 Navigator on Cisco.com at http://www.cisco.com/cisco/software/navigator.html.

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@cisco.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.

The vulnerabilities were 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 at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-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@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.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-September-26 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/web/about/security/psirt/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.