Advisory ID: cisco-sa-20120926-c10k-tunnels
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-c10k-tunnels
Revision 1.1
Last Updated 2013 January 18 17:16 UTC (GMT)
For Public Release 2012 September 26 16:00 UTC (GMT)
Contents
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
Cisco IOS Software contains a queue wedge vulnerability that can be triggered when processing IP tunneled packets. Only Cisco IOS Software running on the Cisco 10000 Series router has been demonstrated to be affected.Successful exploitation of this vulnerability may prevent traffic from transiting the affected interfaces.
Cisco has released free software updates that addresses this vulnerability. There are no workarounds for this vulnerability. This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-c10k-tunnels
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
A device has an affected configuration if the following conditions are true:
- A tunnel interface is configured. See the following sample to determine if a tunnel exists:
Router#show ip interface briefA tunnel interface can be identified under the "Interface" column by the name "Tunnel#", where "#" indicates an interface number, i.e. "Tunnel0" as shown above.
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 172.16.1.1 YES NVRAM up up
GigabitEthernet0/1 172.16.2.1 YES NVRAM up up
NVI0 unassigned YES unset administratively down down
Tunnel0 172.16.5.1 YES manual up up
Note: A Cisco 10000 Series router may be vulnerable even if the tunnels are not explicitly configured. Tunnels may be configured by other features and these tunnels are also potentially affected.
- The tunnel mode is one of the following:
a. GRE/IP - tunnel mode gre ipThe above tunnel modes would correspond to IPv4 protocol 47, 4 or 41 packets.
b. IPIP - tunnel mode ipip
c. IPv6inIP - tunnel mode ipv6ip
Determining if your device is affected
An interface queue wedge is a class of vulnerabilities in which certain packets are received and queued by a Cisco IOS router or switch, but due to a processing error, are never removed from the queue.
Packets that are received by a device are counted against the interface input "queue," which is of a limited and relatively small size. For example, on most platforms the default interface input queue is 75 packets, which is a value that can be configured via the hold-queue value in the interface configuration command. Once the input queue contains nothing but packets that, due to a bug, will never be dequeued, the queue is said to be wedged. More recently this condition has been termed a "blocked interface."
This condition can be viewed on a Cisco IOS device when the input queue size is equal to or greater than (depending on the Cisco IOS Software Release) the input queue max value, as shown below. In this example, the current "size" of the input queue is 75, which is equal to the "max" size of the input queue, which is also 75.
Router#show interface Ethernet 0/0 | include queue Input queue: 75/75/44/0 (size/max/drops/flushes); Output queue: 0/40 (size/max)
For more information about queue wedges and a few detection mechanisms that may be used to identify a blocked interface on Cisco IOS Software (including an Embedded Event Manager, or EEM, script specifically for this purpose and a whitepaper describing how this condition can be detected using SNMP) go to: http://blogs.cisco.com/security/comments/cisco_ios_queue_wedges_explained/
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
Details
The queue wedge may be triggered when processing ingress IP tunneled packets. The packets that trigger the vulnerability are tunneled IP packets of the following types: GRE/IP, IPIP, and IPv6 in IPv4 packets, for tunnels that terminate at the router. Transit traffic does not cause this vulnerability to be triggered.
Successful exploitation of this vulnerability may result in an inability to pass traffic on affected interfaces.
This vulnerability is described in Cisco bug ID CSCts66808 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2012-4620
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
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CSCts66808 - Tunnel Interface input queue is wedged at 76/75 Calculate the environmental score of CSCts66808 |
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CVSS Base Score - 7.8 |
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Access Vector |
Access Complexity |
Authentication |
Confidentiality Impact |
Integrity Impact |
Availability Impact |
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|
Network |
Low |
None |
None |
None |
Complete |
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CVSS Temporal Score - 6.4 |
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Exploitability |
Remediation Level |
Report Confidence |
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Functional |
Official-Fix |
Confirmed |
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Impact
Successful exploitation of the vulnerability may prevent traffic from transiting the affected interfaces.
Software Versions and Fixes
When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses 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 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 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 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 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 |
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 Obtaining Fixed Software section of this advisory. |
| 12.2S | Not vulnerable |
Not vulnerable |
| 12.2SB | Vulnerable; only releases 12.2(33)SB through 12.2(33)SB11 are 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 | Note: Releases prior to 12.2(33)SRC2 are vulnerable; Releases 12.2(33)SRC2 and later are not vulnerable. |
Vulnerable; First fixed in Release 12.2SRE |
| 12.2SRD | Note: Releases prior to 12.2(33)SRD1 are vulnerable; Releases 12.2(33)SRD1 and later are 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 | Not vulnerable |
Vulnerable; releases up to and including 12.2(33)SXH7 are not vulnerable |
| 12.2SXI | Not vulnerable |
12.2(33)SXI10 |
| 12.2SXJ | Not vulnerable |
12.2(33)SXJ4 |
| 12.2SY | Not vulnerable |
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 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 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 Obtaining Fixed Software section of this advisory. |
| 12.2ZD | Not vulnerable |
Vulnerable; contact your support organization per the instructions in 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 Obtaining Fixed Software section of this advisory. |
| 12.2ZP | Not vulnerable |
Vulnerable; contact your support organization per the instructions in 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 |
| There are no affected 12.4 based releases | ||
| 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 | Not vulnerable |
15.0(1)M9 |
| 15.0MR | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
| 15.0MRA | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
| 15.0S | 15.0(1)S5 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 | Not vulnerable |
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 | Not vulnerable |
Vulnerable; First fixed in Release 15.1M |
| 15.1M | Not vulnerable |
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 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; migrate to any release in 15.2SNG |
| 15.1SV | 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. |
| 15.1T | Not vulnerable |
Vulnerable; First fixed in Release 15.1M |
| 15.1XB | Not vulnerable |
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 | Not vulnerable |
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 | Not vulnerable |
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 vulnerability that is disclosed in this document.
Cisco IOS XR Software
Cisco IOS XR Software is not affected by the vulnerability that is disclosed in this document.
Workarounds
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.
This vulnerability was found during troubleshooting of a customer issue.
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-20120926-c10k-tunnels
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-January-18 | Corrected software table placement. |
| 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/en/US/products/products_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.
