Products & Services
Support

Product Categories


Popular Downloads


Manage Software

How to Buy

For Home

Linksys Products Store
Linksys is now part of Belkin
Products for everyone

All Ordering Options

Training & Events Partners
Guest

Cisco Security Advisory

Cisco IOS Software Zone-Based Policy Firewall Session Initiation Protocol Inspection Denial of Service Vulnerability

Advisory ID: cisco-sa-20130327-cce

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130327-cce

Revision 1.1

Last Updated  2013 April 11 15:36  UTC (GMT)

For Public Release 2013 March 27 16:00  UTC (GMT)

Related Resources:

View related IPS SignatureView related Event ResponseView related AlertView related Security Notice

Summary

Cisco IOS Software contains a memory leak vulnerability that could be triggered through the processing of malformed Session Initiation Protocol (SIP) messages. Exploitation of this vulnerability could cause an interruption of services. Only devices that are configured for SIP inspection are affected by this vulnerability.

Cisco has released free software updates that address this vulnerability. There are no workarounds for devices that must run SIP inspection.

This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130327-cce

Note: The March 27, 2013, Cisco IOS Software Security Advisory bundled publication includes seven Cisco Security Advisories. All advisories address vulnerabilities in Cisco IOS Software. 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 March 2013 bundled publication.

Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar13.html


Affected Products


Vulnerable Products

Cisco devices that are running affected Cisco IOS Software versions are vulnerable when Session Initiation Protocol (SIP) application layer gateway (ALG) inspection is configured under the Zone-Based Policy Firewall (ZBFW).

To verify whether the Session Initiation Protocol (SIP) application layer gateway (ALG) inspection under the Zone-Based Policy Firewall (ZBFW) is configured on a device use the show policy-map type inspect zone-pair | include sip privileged EXEC command and check whether the output includes Match: protocol sip. The following is the output from the show policy-map type inspect zone-pair | include sip command executed on a device running Cisco IOS Software that has the Session Initiation Protocol (SIP) application layer gateway (ALG) inspection enabled under the Zone-based Policy Firewall (ZBFW) configuration:

 

Cisco#show policy-map type inspect zone-pair | include sip
      Match: protocol sip
Inspection of SIP traffic is not enabled by default.

Network Address Translation (NAT) of SIP traffic is not affected by this issue.

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

Cisco IOS XR Software is not affected by this vulnerability.

Cisco IOS XE Software is not affected by this vulnerability.

No other Cisco products are currently known to be affected by this vulnerability.

Details

Enhanced Session Initiation Protocol (SIP) inspection is a Cisco IOS firewall feature that provides basic SIP deep packet inspection functionality (SIP packet inspection and pinholes opening) as well as protocol conformance and application security.

A vulnerability in the Session Initiation Protocol (SIP) inspection feature under the Zone-based Policy Firewall (ZBFW) in Cisco IOS Software could allow an unauthenticated, remote attacker to cause a memory leak that would eventually lead to a device reload.

This vulnerability is due to incorrect handling of malformed SIP packets. An attacker could exploit this vulnerability by sending malformed SIP messages through the device. An exploit could cause Cisco IOS Software not to release allocated memory, causing a memory leak. A sustained attack may result in a device reload.

SIP traffic can use UDP port 5060 and TCP ports 5060 and 5061.

Network Address Translation (NAT) of SIP traffic is not affected by this issue.

Note: Only transit traffic can trigger this vulnerability; SIP traffic destined to a vulnerable device cannot trigger this vulnerability.

This vulnerability is documented in Cisco bug ID CSCtl99174 (registered customers only), and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2013-1145.

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



CSCtl99174-- IOSFW: Chunk leaks under certain conditions for malformed SIP packets

Calculate the environmental score of CSCtl99174

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 - 6.1

Exploitability

Remediation Level

Report Confidence

Proof-of-Concept

Official-Fix

Confirmed


Impact

Successful exploitation of the vulnerability could cause a memory leak on an affected device. Repeated exploitation could cause an affected device to reload, resulting in a denial of service (DoS) condition.

Software Versions and Fixes

When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses and Notices archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

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 2013 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 Release      Availability of Repaired Releases
Affected 12.0-Based Releases First Fixed Release First Fixed Release for All Advisories in the March 2013 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 March 2013 Bundled Publication
12.2 Not vulnerable
Not vulnerable
12.2B Not vulnerable
Not vulnerable
12.2BC Not vulnerable
Not vulnerable
12.2BW Not vulnerable
Not vulnerable
12.2BX Not vulnerable
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
Not vulnerable
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
Vulnerable; First fixed in Release 12.2SG
Releases up to and including 12.2(20)EW4 are not vulnerable. 
12.2EWA Not vulnerable
Vulnerable; First fixed in Release 12.2SG
Releases up to and including 12.2(20)EWA4 are 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 15.2S
12.2EZ Not vulnerable
Vulnerable; First fixed in Release 15.0SE
12.2FX Not vulnerable
Vulnerable; First fixed in Release 15.0SE
12.2FY Not vulnerable
Vulnerable; First fixed in Release 15.0SE
12.2FZ Not vulnerable
Vulnerable; First fixed in Release 15.0SE
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 Obtaining Fixed Software section of this advisory.
12.2IRH Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.2IRI Not vulnerable
Vulnerable; contact your support organization per the instructions in 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
Not vulnerable
12.2MRA Not vulnerable
Vulnerable; First fixed in Release 12.2SRE
12.2MRB Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.2S Not vulnerable

Vulnerable. Only releases 12.2(25)S through 12.2(25)S15 are vulnerable
12.2SB Not vulnerable
12.2(33)SB12
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
12.2SCH Not vulnerable
Not vulnerable
12.2SE Not vulnerable
12.2(55)SE7
Releases up to and including 12.2(54)SE4 are not vulnerable. 
12.2SEA Not vulnerable
Vulnerable; First fixed in Release 15.0SE
12.2SEB Not vulnerable
Vulnerable; First fixed in Release 15.0SE
12.2SEC Not vulnerable
Vulnerable; First fixed in Release 15.0SE
12.2SED Not vulnerable
Vulnerable; First fixed in Release 15.0SE
12.2SEE Not vulnerable
Vulnerable; First fixed in Release 15.0SE
12.2SEF Not vulnerable
Vulnerable; First fixed in Release 15.0SE
12.2SEG Not vulnerable
Releases prior to 12.2(25)SEG4 are vulnerable; Releases 12.2(25)SEG4 and later are not vulnerable. First fixed inRelease 15.0SE
12.2SG Not vulnerable
12.2(53)SG9
12.2SGA Not vulnerable
Vulnerable; First fixed in Release 12.2SG
12.2SM Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.2SO Not vulnerable
Not vulnerable
12.2SQ Not vulnerable
12.2(50)SQ5
12.2SRA Not vulnerable
Vulnerable; First fixed in Release 12.2SRE
12.2SRB Not vulnerable
Vulnerable; First fixed in Release 12.2SRE
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)SRE8
12.2STE Not vulnerable
Not vulnerable
12.2SU Not vulnerable
Not vulnerable
12.2SV Not vulnerable

Vulnerable. Only releases 12.2(25)SV2, 12.2(27)SV5 and 12.2(29)SV3 are 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
Vulnerable; First fixed in Release 15.0M *
Releases up to and including 12.2(23)SW1 are 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 Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. 
12.2SXI Not vulnerable
12.2(33)SXI11
12.2SXJ Not vulnerable
12.2(33)SXJ5
12.2SY Not vulnerable
12.2(50)SY4
12.2SZ Not vulnerable
Not vulnerable
12.2T Not vulnerable
Not vulnerable
12.2TPC Not vulnerable
Not vulnerable
12.2WO Not vulnerable
Not vulnerable
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
Releases prior to 12.2(54)XO are vulnerable; Releases 12.2(54)XO and later are not vulnerable. First fixed inRelease 12.2SG
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
Not vulnerable
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
Not vulnerable
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
Not vulnerable
12.2ZD Not vulnerable
Not vulnerable
12.2ZE Not vulnerable
Not vulnerable
12.2ZH Not vulnerable
Not vulnerable
12.2ZJ Not vulnerable
Not vulnerable
12.2ZP Not vulnerable
Not vulnerable
12.2ZU Not vulnerable
Not vulnerable
12.2ZX Not vulnerable
Not vulnerable
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 March 2013 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 March 2013 Bundled Publication
12.4 Not vulnerable
Vulnerable; First fixed in Release 15.0M *
12.4GC Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4JA Not vulnerable
Not vulnerable
12.4JAL Not vulnerable
Not vulnerable
12.4JAM Not vulnerable
Releases prior to 12.4(25e)JAM are vulnerable; Releases 12.4(25e)JAM and later are not vulnerable. Migrate to any release in 12.4JAN12.4(25e)JAM
12.4JAX Not vulnerable
Not vulnerable
12.4JAZ 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 Vulnerable; First fixed in Release 12.4MDB
Releases up to and including 12.4(15)MD5 are not vulnerable. 
Vulnerable; First fixed in Release 12.4MDB
12.4MDA Vulnerable; First fixed in Release 12.4MDB
Vulnerable; First fixed in Release 12.4MDB
12.4MDB 12.4(24)MDB13
12.4(24)MDB13
12.4MR Releases up to and including 12.4(19)MR3 are not vulnerable. 
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4MRA Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4MRB Vulnerable; First fixed in Release 15.0M *
Vulnerable; First fixed in Release 15.0M *
12.4SW Not vulnerable
Vulnerable; First fixed in Release 15.0M *
12.4T Vulnerable; First fixed in Release 15.0M *
Releases up to and including 12.4(15)T17 are not vulnerable. 
Vulnerable; First fixed in Release 15.0M *
12.4XA Not vulnerable
Vulnerable; First fixed in Release 15.0M *
12.4XB Not vulnerable
Vulnerable; First fixed in Release 15.0M *
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 *
12.4XL Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4XM Not vulnerable
Vulnerable; First fixed in Release 15.0M *
12.4XN Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4XP Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4XQ Not vulnerable
Vulnerable; First fixed in Release 15.0M *
12.4XR Vulnerable; First fixed in Release 15.0M *
Releases up to and including 12.4(15)XR10 are not vulnerable. 
Vulnerable; First fixed in Release 15.0M *
12.4XT Not vulnerable
Vulnerable; First fixed in Release 15.0M *
12.4XV Not vulnerable
Vulnerable; contact your support organization per the 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 Vulnerable; First fixed in Release 15.0M *
Vulnerable; First fixed in Release 15.0M *
12.4YA Vulnerable; First fixed in Release 15.0M *
Vulnerable; First fixed in Release 15.0M *
12.4YB Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4YD Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4YE 12.4(24)YE3e
12.4(24)YE3e
12.4YG Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
Affected 15.0-Based Releases First Fixed Release First Fixed Release for All Advisories in the March 2013 Bundled Publication
15.0EB Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
15.0ED Not vulnerable
Not vulnerable
15.0EY Not vulnerable
Not vulnerable
15.0M 15.0(1)M10 *
15.0(1)M10 *
15.0MR Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
15.0S Not vulnerable
Vulnerable; First fixed in Release 15.1S
Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
15.0SE Not vulnerable
15.0(2)SE1
15.0SG Not vulnerable
Not vulnerable
Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
15.0SQA Not vulnerable

Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
15.0SY Not vulnerable
15.0(1)SY4
15.0XA Vulnerable; First fixed in Release 15.1M
Vulnerable; First fixed in Release 15.1M
15.0XO Not vulnerable

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 March 2013 Bundled Publication
15.1EY Not vulnerable
Vulnerable; First fixed in Release 15.2S
15.1GC 15.1(4)GC1
15.1(4)GC1
15.1M 15.1(4)M6
15.1(4)M6
15.1MR Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
15.1MRA Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
15.1S

Not vulnerable

See footnote
Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
15.1SG Not vulnerable
Not vulnerable
Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
15.1SNG Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
15.1SNH Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
15.1SNI Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
15.1SVA Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
15.1SVC Not vulnerable
Not vulnerable
15.1SY Not vulnerable
15.1(1)SY1; Available on 24-MAY-13
15.1T Vulnerable; First fixed in Release 15.1M
Vulnerable; First fixed in Release 15.1M
15.1XB Vulnerable; First fixed in Release 15.1M
Vulnerable; First fixed in Release 15.1M
Affected 15.2-Based Releases First Fixed Release First Fixed Release for All Advisories in the March 2013 Bundled Publication
There are no affected 15.2 based releases
Affected 15.3-Based Releases First Fixed Release First Fixed Release for All Advisories in the March 2013 Bundled Publication
There are no affected 15.3 based releases

* Cisco IOS Software Release 15.0M will reach End of Software Maintenance on April 1, 2013, and no additional rebuilds will occur. Please review the End-of-Life Notice for additional information. Customers are advised to consider migrating to Cisco IOS Software Release 15.1M.

For Cisco 7600 Series Routers, the first fixed release for all Cisco Security Advisories in the March 2013 bundled publication is Cisco IOS Software Release 15.1(3)S5. For Cisco 7200 and 7300 Series Routers, the first fixed release for all advisories in the March 2013 bundled publication is Cisco IOS Software Release 15.1(3)S5a, which will be available on April 15, 2013. 

Cisco IOS XE Software

Cisco IOS XE Software is not affected by the vulnerability disclosed in this advisory. 

Cisco IOS XR Software

Cisco IOS XR Software is not affected by the vulnerability disclosed in this advisory.


Workarounds

Disabling inspection of SIP traffic will mitigate this vulnerability. Inspection of SIP traffic can be disabled by removing the match protocol sip command from the corresponding class map used by the Zone-Based Policy Firewall (ZBFW) configuration. The following example shows how to remove this command from the class map:
router(config)#class-map type inspect match-any INSP-TRAFFIC-PROTOCOL
router(config-cmap)#no match protocol sip

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.

This vulnerability was discovered by Cisco during normal internal security testing.

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-20130327-cce

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 1.1 2013-April-11 Updated vulnerability status for 15.0EY and 15.0SG in bundle-wide column.
Revision 1.0 2013-March-27 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.
Download this document (PDF)
 Download OVAL
View Printable Version