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Cisco Security Advisory

Cisco IOS Software Zone-Based Firewall Vulnerabilities

Advisory ID: cisco-sa-20120328-zbfw

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-zbfw

Revision 1.0

For Public Release 2012 March 28 16:00  UTC (GMT)

Related Resources:

View related IPS Signature

Summary

Cisco IOS Software contains four vulnerabilities related to Cisco IOS Zone-Based Firewall features. These vulnerabilities are as follows:
  • Memory Leak Associated with Crafted IP Packets 
  • Memory Leak in HTTP Inspection 
  • Memory Leak in H.323 Inspection 
  • Memory Leak in SIP Inspection 
Workarounds that mitigate these vulnerabilities are not available.

Cisco has released free software updates that address these vulnerabilities.

This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-zbfw

Note: The March 28, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. 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 March 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_mar12.html

Affected Products


Vulnerable Products

Cisco IOS devices running vulnerable versions of Cisco IOS Software are affected by four vulnerabilities in the Cisco IOS Zone-Based Firewall. The vulnerabilities are independent of each other. Details to confirm affected configurations are provided below.

To determine whether a device is configured with Zone-Based Firewall, log in to the device and issue the show zone security command-line interface (CLI) command. If the output shows a member interface under a zone name, the device is vulnerable. The following example shows a device with Zone-Based Firewall rules configured on both GigabitEthernet0/0 and GigabitEthernet0/1:

Router#show zone security
zone self
  Description: System defined zone

zone inside
  Description: *** Inside Network ***
  Member Interfaces:
    GigabitEthernet0/0

zone outside
  Description: *** Outside Network ***
  Member Interfaces:
    GigabitEthernet0/1

Router#
The following sections provide more details on the specific features containing the vulnerabilities.

Memory Leak Associated with Crafted IP Packets
There is no specific configuration necessary for a device to be vulnerable to the memory leak associated with crafted IP packets. If the Zone-Based Firewall is configured, the device is vulnerable.

Memory Leak in HTTP Inspection
For the device to be vulnerable to the memory leak associated with HTTP inspection, the Zone-Based Firewall must be configured to perform HTTP inspection with the Zone-Based Firewall.

To determine whether a device is configured for HTTP inspection, enter the command show policy-map type inspect zone-pair | include Match: protocol http. The following example shows a vulnerable device configured with Cisco IOS Zone-Based Policy Firewall HTTP inspection:
Router#show policy-map type inspect zone-pair | include Match: protocol http 
       Match: protocol http 
Memory Leak in H.323 Inspection
For a device to be vulnerable to the memory leak associated with H.323 inspection, the Zone-Based Firewall must be configured to perform H.323 inspection. To determine if a device is configured for H.323 inspection enter the command show policy-map type inspect zone-pair | include Match: protocol h323. If the output contains "Match: protocol h323" the device is vulnerable. The following example shows a vulnerable device configured with Cisco IOS Zone-Based Policy Firewall H.323 inspection:
Router# show policy-map type inspect zone-pair | include Match: protocol h323
        Match: protocol h323
Memory Leak in SIP Inspection
The device is vulnerable if the configuration has either a Layer 4 or Layer 7 Session Initiation Protocol (SIP) application-specific policy configured, and the policy is applied to any firewall zone. To determine whether a device is configured for SIP inspection enter the command show policy-map type inspect zone-pair | include Match: protocol sip. If the output contains "Match: protocol sip" the device is vulnerable. The following example shows a vulnerable device configured with Cisco IOS Zone-Based Policy Firewall SIP inspection:
Router# show policy-map type inspect zone-pair | include Match: protocol sip    
        Match: protocol sip

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

The following products are confirmed not vulnerable:
  • Cisco PIX 500 Series Firewall
  • Cisco ASA 5500 Series Adaptive Security Appliance
  • Firewall Services Module (FWSM) for Catalyst 6500 Series Switches and 7600 Series Routers
  • Virtual Firewall (VFW) application on the multiservice blade (MSB) on the Cisco XR 12000 Series Router
  • Cisco ACE Application Control Engine Module
  • Cisco IOS devices configured with legacy Cisco IOS Firewall support 
  • Cisco IOS XR Software
  • Cisco IOS XE Software
  • Cisco Catalyst 6500 Series ASA Services Module
  • Context-Based Access Control (CBAC) 
No other Cisco products are currently known to be affected by these vulnerabilities.

Details

Firewalls are networking devices that control access to the network assets of an organization. Firewalls are often positioned at the entrance points of networks. Cisco IOS Software provides a set of security features that allow the configuration of a firewall policy to match an organization's requirements. 

The vulnerabilities described in this advisory affect the Zone-Based Firewall feature. The Zone-Based Policy Firewall (also known as Zone-Policy Firewall or ZFW) updates the firewall configuration from the older interface-based model to a more flexible, more easily understood zone-based model. Interfaces are assigned to zones, and inspection policy is applied to traffic moving between the zones. Inter-zone policies offer considerable flexibility and granularity, so different inspection policies can be applied to multiple host groups connected to the same router interface.

 More information on the Zone-Based Firewall is available at http://www.cisco.com/en/US/products/ps6441/products_feature_guide09186a008060f6dd.html

Memory Leak Associated with Crafted IP Packets
A vulnerability exists in the Zone-Based Firewall implementation in Cisco IOS Software that could allow a remote attacker to cause an affected device to reload or to trigger memory leaks that may result in system instabilities. These vulnerabilities are triggered when the device that is running Cisco IOS Software processes crafted IP packets. Only traffic destined to an IP address configured on the device can trigger the vulnerability; transit traffic is not an exploit vector.

This vulnerability is documented in Cisco bug ID CSCto89536 (registered customers only) and has been assigned the Common Vulnerabilities and Exposures (CVE) identifier CVE-2012-1310.

Memory Leak in HTTP Inspection
The HTTP Inspection Engine feature allows users to configure their Cisco IOS Firewall to detect and filter HTTP connections—such as tunneling over port 80, unauthorized request methods, and non-HTTP compliant file transfers—that are not authorized within the scope of the security policy configuration.

A vulnerability exists in the implementation of the Cisco IOS Software HTTP inspection feature that could allow a remote attacker to cause an affected device to reload or to trigger memory leaks that may result in system instabilities. This vulnerability is triggered when the device that is running Cisco IOS Software processes certain HTTP messages. Transit HTTP traffic is an exploit vector.

This vulnerability is documented in Cisco bug ID CSCtq36153 (registered customers only) and has been assigned CVE ID CVE-2012-0387.

More information on HTTP inspection is available at http://www.cisco.com/en/US/docs/ios/12_3t/12_3t14/feature/guide/gt_fwapc.html.

Memory Leak in H.323 Inspection
H.323 is the ITU standard for real-time multimedia communications and conferencing over packet-based (IP) networks. A vulnerability exists in the implementation of the Cisco IOS Software H.323 inspection feature that could allow a remote attacker to cause an affected device to reload or to trigger memory leaks that may result in system instabilities. This vulnerability is triggered when the device that is running Cisco IOS Software processes malformed H.323 messages. Transit H.323 traffic is an exploit vector.

This vulnerability is documented in Cisco bug ID CSCtq45553 (registered customers only) and has been assigned the CVE ID CVE-2012-0388.


Memory Leak in SIP Inspection
SIP is a popular signaling protocol that is used to manage voice and video calls across IP networks, such as the Internet. SIP is responsible for handling all aspects of call setup and termination. Voice and video are the most popular types of sessions that SIP handles, but the protocol has the flexibility to accommodate other applications that require call setup and termination. SIP call signaling can use UDP (port 5060), TCP (port 5060), or Transport Layer Security (TLS; TCP port 5061) as the underlying transport protocol.

A vulnerability exists in the implementation of the Cisco IOS SIP inspection feature that could allow a remote attacker to cause an affected device to reload or to trigger memory leaks that may result in system instabilities. This vulnerability is triggered when the device that is running Cisco IOS Software processes crafted SIP messages. Transit SIP traffic is an exploit vector.

This vulnerability is documented in Cisco bug ID CSCti46171 (registered customers only) and has been assigned CVE ID CVE-2012-1315.


Memory Leak Detection
Detected memory leaks can be viewed using the command show memory debug leaks chunks in privileged EXEC mode, as shown in the following example:
Router# show memory debug leaks chunks 
Adding blocks for GD... I/O memory Address Size Alloc_pc PID Alloc-Proc Name Chunk Elements:
AllocPC Address Size Parent Name Processor memory Address Size Alloc_pc PID Alloc-Proc Name
4733113C 188 419CB164 129 IP Input FW h225 tpkt
The previous example shows a memory leak in the process FW h225 tpkt. The show memory debug leaks command was introduced in Cisco IOS Software versions 12.3(8)T1 and 12.2(25)S.

Caution: All show memory debug commands must be used on customer networks only to diagnose the router for memory leaks when memory depletion is observed. These commands may cause high CPU utilization and may cause time-sensitive protocols to flap. These commands are recommended to be used in maintenance windows.

Vulnerability Scoring Details

Cisco has scored the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

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

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.

Cisco has provided additional information regarding CVSS at the following link:

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link:

http://intellishield.cisco.com/security/alertmanager/cvss

Memory Leak associated with crafted IP packets

Calculate the environmental score of CSCto89536

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


Memory Leak in HTTP inspection

Calculate the environmental score of CSCtq36153

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


Memory Leak in H.323 inspection

Calculate the environmental score of CSCtq45553

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

Memory Leak in SIP Inspection

Calculate the environmental score of CSCti46171

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 these vulnerabilities may result in a reload of the affected device. Repeated exploit attempts may result in a sustained denial of service (DoS) attack.

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 March 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 March 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 March 2012 Cisco IOS Software Security Advisory Bundled Publication
There are no affected 12.2 based releases
Affected 12.3-Based Releases First Fixed Release First Fixed Release for All Advisories in the March 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 March 2012 Cisco IOS Software Security Advisory 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
12.4(23c)JA4
12.4(25e)JA
12.4JAX Not vulnerable
Vulnerable; First fixed in Release 12.4JA
12.4JDA Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4JDC Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4JDD Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4JDE Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4JHA Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4JHB Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4JHC Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4JK Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4JL Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
12.4JX Not vulnerable
Vulnerable; First fixed in Release 12.4JA
12.4JY Not vulnerable
Vulnerable; First fixed in Release 12.4JA
12.4JZ Not vulnerable
Vulnerable; First fixed in Release 12.4JA
12.4MD 12.4(22)MD3; Available on 30-MAR-12
12.4(22)MD3; Available on 30-MAR-12
12.4MDA 12.4(24)MDA11
12.4(24)MDA11
12.4MDB 12.4(24)MDB5a
12.4(24)MDB5a
12.4MDC Not vulnerable
Not vulnerable
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 12.4(24)T7

Releases up to and including 12.4(15)T17 are not vulnerable.
12.4(15)T17
12.4(24)T7

12.4XA Not vulnerable
Vulnerable; First fixed in Release 15.0M
12.4XB Not vulnerable
Vulnerable; First fixed in Release 12.4T
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 12.4T
Releases up to and including 12.4(15)XR10 are not vulnerable.
Vulnerable; First fixed in Release 12.4T
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)YE3d
12.4(24)YE3d
12.4YG 12.4(24)YG4
12.4(24)YG4
Affected 15.0-Based Releases First Fixed Release First Fixed Release for All Advisories in the March 2012 Cisco IOS Software Security Advisory Bundled Publication
15.0M 15.0(1)M8
15.0(1)M8
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 Not vulnerable
15.0(1)S5 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
15.0SA Not vulnerable
Not vulnerable
15.0SE Not vulnerable
15.0(1)SE1
15.0SG Not vulnerable
15.0(2)SG2 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
15.0SY Not vulnerable
15.0(1)SY1
15.0XA Vulnerable; First fixed in Release 15.1T
Vulnerable; First fixed in Release 15.1T
15.0XO Not vulnerable
Vulnerable; First fixed in Release 15.0SG 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 2012 Cisco IOS Software Security Advisory Bundled Publication
15.1EY Not vulnerable
15.1(2)EY2
15.1GC 15.1(2)GC2
15.1(2)GC2
15.1M 15.1(4)M3

15.1(4)M4; Available on 30-MAR-12
15.1MR Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
15.1S Not vulnerable
15.1(3)S2 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
15.1SG Not vulnerable
Not vulnerable
15.1SNG Not vulnerable
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
15.1SNH Not vulnerable
Not vulnerable
15.1T 15.1(3)T3
15.1(3)T3
15.1XB Vulnerable; First fixed in Release 15.1T
Vulnerable; First fixed in Release 15.1T
Affected 15.2-Based Releases First Fixed Release First Fixed Release for All Advisories in the March 2012 Cisco IOS Software Security Advisory Bundled Publication
15.2GC 15.2(1)GC2
15.2(1)GC2
15.2S Not vulnerable
15.2(1)S1 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability

15.2T 15.2(1)T2
15.2(2)T
15.2(2)T1
15.2(1)T2
15.2(2)T1
15.2(3)T; Available on 30-MAR-12

* Cisco Catalyst 3550 Series Switches support the Internet Key Exchange (IKE) feature and are vulnerable to Cisco bug ID CSCts38429 when the devices are running Layer 3 images; however, this product reached the End of Software Maintenance milestone.  Cisco 3550 Series SMI Switches that are running Layer 2 images do not support IKE and are not vulnerable.  No other Cisco devices that run 12.2SE-based software are vulnerable.

Cisco IOS XE Software

Cisco IOS XE Software is not affected by the vulnerabilities that are disclosed in this document. 

For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, and Cisco IOS XE 3SG Release Notes.

Cisco IOS XR Software

Cisco IOS XR Software is not affected by any of the vulnerabilities disclosed in the March 2012 Cisco IOS Software Security Advisory Bundled Publication.


Workarounds

There are no workarounds that mitigate the vulnerabilities described in this advisory.

Obtaining Fixed Software

Cisco has released free software updates that address the vulnerabilities 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, or as set forth 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, upgrades should be obtained through the Software Center on Cisco.com at http://www.cisco.com.

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 vulnerabilities that are described in this advisory. 

These vulnerabilities were 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-20120328-zbfw

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:

  • cust-security-announce@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk

Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates. 


Revision History

Revision 1.0 2012-March-28 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.
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