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 software updates that address this vulnerability.

  Workarounds that mitigate this vulnerability are also available.

  This advisory is posted at https://sec.cloudapps.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.

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.

Fixed Software

• 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 (SIO) portal at https://sec.cloudapps.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.

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.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-c10k

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

  
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