Cisco 10000 Series Denial of Service Vulnerability

Advisory ID: cisco-sa-20110928-c10k

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-c10k

Revision 1.3

Last Updated 2012 September 21 19:17 UTC (GMT)

For Public Release 2011 September 28 16:00 UTC (GMT)

Summary
Affected Products
Details
Vulnerability Scoring Details
Impact
Software Versions and Fixes
Workarounds
Obtaining Fixed Software
Exploitation and Public Announcements
Status of this Notice: Final
Distribution
Revision History
Cisco Security Procedures

Summary

The Cisco 10000 Series Router is affected by a denial of service (DoS) vulnerability where an attacker could cause a device reload by sending a series of ICMP packets.

Cisco has released free software updates that address this vulnerability.

Workarounds that mitigate this vulnerability are also available.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-c10k.

Note: The September 28, 2011, Cisco IOS Software Security Advisory bundled publication includes ten Cisco Security Advisories. Nine of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses a vulnerability in Cisco Unified Communications Manager. 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 September 2011 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_sep11.html

Affected Products

Vulnerable Products

Cisco 10000 Series Routers that are running an affected version of Cisco IOS are affected.

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 the white paper Cisco IOS and NX-OS Software Reference Guide available 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

The Cisco 10000 Series Router is affected by a denial of service (DoS) vulnerability where an unauthenticated attacker could cause a device reload by sending a series of ICMP packets.

Traffic destined to the device or transit traffic could trigger the effects of this vulnerability.

This vulnerability is documented in Cisco Bug ID CSCtk62453 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2011-3270.

Vulnerability Scoring Details

Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html .

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at
http://intellishield.cisco.com/security/alertmanager/cvss .

CSCtk62453 - Certain ICMP packets may cause device to reload Calculate the environmental score of CSCtk62453
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 this vulnerability could cause an affected device to reload. Repeated exploitation could result in a sustained DoS condition.

Software Versions and Fixes

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.

Additionally, the Cisco IOS Software Checker is available on the Cisco Security Intelligence Operations (SIO) portal at http://tools.cisco.com/security/center/selectIOSVersion.x. It provides several features for checking which Security Advisories affect specified versions of Cisco IOS 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 For This Advisory column. The First Fixed Release for All Advisories in the September 2011 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.

Major Release	Availability of Repaired Releases
Affected 12.0-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2011 Bundled Publication
There are no affected 12.0 based releases
Affected 12.1-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2011 Bundled Publication
There are no affected 12.1 based releases
Affected 12.2-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2011 Bundled Publication
12.2	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2B	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2BC	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2BW	Not vulnerable	Not vulnerable
12.2BX	Not vulnerable	Vulnerable; First fixed in Release 12.2SB
12.2BY	Not vulnerable	Not vulnerable
12.2BZ	Not vulnerable	Not vulnerable
12.2CX	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2CY	Not vulnerable	Not vulnerable
12.2CZ	Not vulnerable	Vulnerable; First fixed in Release 12.2SB
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	Releases up to and including 12.2(20)EW4 are not vulnerable.
12.2EWA	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2EX	Not vulnerable	12.2(55)EX3
12.2EY	Not vulnerable	12.2(58)EY
12.2EZ	Not vulnerable	Vulnerable; migrate to any release in 15.0SE
12.2FX	Not vulnerable	Vulnerable; First fixed in Release 12.2SE
12.2FY	Not vulnerable	Vulnerable; First fixed in Release 12.2EX
12.2FZ	Not vulnerable	Vulnerable; First fixed in Release 12.2SE
12.2IRA	Not vulnerable	Vulnerable; migrate to any release in 12.2IRG
12.2IRB	Not vulnerable	Vulnerable; migrate to any release in 12.2IRG
12.2IRC	Not vulnerable	Vulnerable; migrate to any release in 12.2IRG
12.2IRD	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
12.2IRE	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
12.2IRF	Not vulnerable	Vulnerable; migrate to any release in 12.2IRG
12.2IRG	Not vulnerable	Not vulnerable
12.2IXA	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2IXB	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2IXC	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2IXD	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2IXE	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2IXF	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2IXG	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2IXH	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2JA	Not vulnerable	Not vulnerable
12.2JK	Not vulnerable	Not vulnerable
12.2MB	Not vulnerable	Not vulnerable
12.2MC	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2MRA	Not vulnerable	Vulnerable; First fixed in Release 12.2SRD
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	12.2(30)S are vulnerable; Releases12.2(30)S and later are not vulnerable. First fixed in Release 12.2SB
12.2SB	Releases prior to 12.2(31)SB18 and 12.2(33)SB9 are not vulnerable. 12.2(33)SB10	12.2(31)SB20 12.2(33)SB10
12.2SBC	Not vulnerable	Vulnerable; First fixed in Release 12.2SB
12.2SCA	Not vulnerable	Vulnerable; First fixed in Release 12.2SCC
12.2SCB	Not vulnerable	Vulnerable; First fixed in Release 12.2SCC
12.2SCC	Not vulnerable	12.2(33)SCC7
12.2SCD	Not vulnerable	12.2(33)SCD6
12.2SCE	Not vulnerable	12.2(33)SCE1 12.2(33)SCE2
12.2SCF	Not vulnerable	Not vulnerable
12.2SE	Not vulnerable	12.2(55)SE3 12.2(58)SE
12.2SEA	Not vulnerable	Vulnerable; First fixed in Release 12.2SE
12.2SEB	Not vulnerable	Vulnerable; First fixed in Release 12.2SE
12.2SEC	Not vulnerable	Vulnerable; First fixed in Release 12.2SE
12.2SED	Not vulnerable	Vulnerable; First fixed in Release 12.2SE
12.2SEE	Not vulnerable	Vulnerable; First fixed in Release 12.2SE
12.2SEF	Not vulnerable	Vulnerable; First fixed in Release 12.2SE
12.2SEG	Not vulnerable	Releases prior to 12.2(25)SEG4 are vulnerable; Releases12.2(25)SEG4 and later are not vulnerable. First fixed in Release 12.2EX
12.2SG	Not vulnerable	Releases prior to 12.2(53)SG4 are vulnerable; Releases 12.2(53)SG4 and later are not vulnerable.
12.2SGA	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2SL	Not vulnerable	Not vulnerable
12.2SM	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2SO	Not vulnerable	Not vulnerable
12.2SQ	Not vulnerable	12.2(50)SQ3
12.2SRA	Not vulnerable	Vulnerable; First fixed in Release 12.2SRD
12.2SRB	Not vulnerable	Vulnerable; First fixed in Release 12.2SRD
12.2SRC	Not vulnerable	Vulnerable; First fixed in Release 12.2SRD
12.2SRD	Not vulnerable	12.2(33)SRD6
12.2SRE	Not vulnerable	12.2(33)SRE4
12.2STE	Not vulnerable	Not vulnerable
12.2SU	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2SV	Not vulnerable	Releases prior to 12.2(29a)SV are vulnerable; Releases 12.2(29a)SV and later are not vulnerable. Migrate to any release in 12.2SVD
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; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2SX	Not vulnerable	Vulnerable; First fixed in Release 12.2SXF
12.2SXA	Not vulnerable	Vulnerable; First fixed in Release 12.2SXF
12.2SXB	Not vulnerable	Vulnerable; First fixed in Release 12.2SXF
12.2SXD	Not vulnerable	Vulnerable; First fixed in Release 12.2SXF
12.2SXE	Not vulnerable	Vulnerable; First fixed in Release 12.2SXF
12.2SXF	Not vulnerable	12.2(18)SXF17b
12.2SXH	Not vulnerable	Vulnerable; First fixed in Release 12.2SXI
12.2SXI	Not vulnerable	12.2(33)SXI6
12.2SXJ	Not vulnerable	12.2(33)SXJ1
12.2SY	Not vulnerable	Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.
12.2SZ	Not vulnerable	Vulnerable; First fixed in Release 12.2SB
12.2T	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2TPC	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2XA	Not vulnerable	Not vulnerable
12.2XB	Not vulnerable	Vulnerable; First fixed in Release 12.4
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
12.2XN	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; Releases12.2(54)XO and later 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	Vulnerable; First fixed in Release 12.4
12.2YB	Not vulnerable	Not vulnerable
12.2YC	Not vulnerable	Not vulnerable
12.2YD	Not vulnerable	Not vulnerable
12.2YE	Not vulnerable	Not vulnerable
12.2YF	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YG	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YH	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YJ	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YK	Not vulnerable	Not vulnerable
12.2YL	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YM	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2YN	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YO	Not vulnerable	Not vulnerable
12.2YP	Not vulnerable	Not vulnerable
12.2YQ	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YR	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YS	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YT	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YU	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YV	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YW	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YX	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YY	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2YZ	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2ZA	Not vulnerable	Vulnerable; First fixed in Release 12.2SXF
12.2ZB	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2ZC	Not vulnerable	Not vulnerable
12.2ZD	Not vulnerable	Not vulnerable
12.2ZE	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2ZF	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2ZG	Not vulnerable	Not vulnerable
12.2ZH	Not vulnerable	Vulnerable; First fixed in Release 12.4
12.2ZJ	Not vulnerable	Not vulnerable
12.2ZL	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2ZP	Not vulnerable	Not vulnerable
12.2ZU	Not vulnerable	Vulnerable; First fixed in Release 12.2SXH
12.2ZX	Not vulnerable	Not vulnerable
12.2ZY	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
12.2ZYA	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
Affected 12.3-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2011 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 2011 Bundled Publication
There are no affected 12.4 based releases
Affected 15.0-Based Releases	First Fixed Release	Bundle First Fixed Release
15.0M	Not vulnerable	15.0(1)M7
15.0MR	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
15.0MRA	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
15.0S	15.0(1)S3a	15.0(1)S4
15.0SA	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
15.0SE	Not vulnerable	Not vulnerable
15.0SG	Not vulnerable	Not vulnerable
15.0XA	Not vulnerable	Vulnerable; First fixed in Release 15.1T
15.0XO	Not vulnerable	Releases prior to 15.0(2)XO1 are vulnerable; Releases15.0(2)XO1 and later are not vulnerable.
Affected 15.1-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2011 Bundled Publication
15.1EY	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
15.1GC	Not vulnerable	Vulnerable; First fixed in Release 15.1T
15.1M	Not vulnerable	15.1(4)M2; Available on 30-SEP-11
15.1MR	Not vulnerable	Vulnerable; contact your support organization per the instructions in theObtaining Fixed Software section of this advisory.
15.1S	Not vulnerable	15.1(2)S2 15.1(3)S
15.1T	Not vulnerable	15.1(1)T4 on 09-DEC-2011 15.1(2)T4 15.1(3)T2
15.1XB	Not vulnerable	Vulnerable; First fixed in Release 15.1T
Affected 15.2-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2011 Bundled Publication
There are no affected 15.2 based releases

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.

Cisco IOS XR Software is not affected by the vulnerabilities disclosed in the September 28, 2011, Cisco IOS Software Security Advisory bundled publication.

Workarounds

Traffic destined to the device or transit traffic could trigger the effects of this vulnerability. Subsequently, the only workaround available is to block ICMP packets destined to the affected device and all ICMP transit traffic.

Obtaining Fixed Software

Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml .

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com.

Customers using Third Party Support Organizations

Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers without Service Contracts

Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

+1 800 553 2447 (toll free from within North America)
+1 408 526 7209 (toll call from anywhere in the world)
e-mail: tac@cisco.com

Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

This vulnerability was discovered while troubleshooting a customer service request.

Status of this Notice: Final

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.

Distribution

This advisory is posted on Cisco's worldwide website at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-c10k

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

cust-security-announce@cisco.com
first-teams@first.org
bugtraq@securityfocus.com
vulnwatch@vulnwatch.org
cisco@spot.colorado.edu
cisco-nsp@puck.nether.net
full-disclosure@lists.grok.org.uk
comp.dcom.sys.cisco@newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.

Revision History

Revision 1.3	2012-February-17	Updated information in Ciso IOS Software table for Cisco IOS 12.2SXH
Revision 1.2	2011-December-16	Correct a broken link in the Summary section.
Revision 1.1	2011-September-30	Update IOS Software table bundled publication first fixed information.
Revision 1.0	2011-September-28	Initial public release

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.

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