Guest

Product Support

Multiple Vulnerabilities in Cisco Firewall Services Module Software

Advisory ID: cisco-sa-20130410-fwsm

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130410-fwsm

Revision 1.0

For Public Release 2013 April 10 16:00  UTC (GMT)


Summary

Cisco Firewall Services Module (FWSM) Software for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers is affected by the following vulnerabilities:
  • FWSM HTTP Proxy Traceback Vulnerability
  • IKE Version 1 Denial of Service Vulnerability
These vulnerabilities are independent of each other; a release that is affected by one of the vulnerabilities may not be affected by the other.

Successful exploitation of either of these vulnerabilities may result in a reload of an affected device, leading to a denial of service (DoS) condition.

Cisco has released free software updates that address these vulnerabilities. A workaround is available for the IKE vulnerability.

This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130410-fwsm


Note: The Cisco Adaptive Security Appliance (ASA) may be affected by some of the vulnerabilities listed above. A separate Cisco Security Advisory has been published to disclose the vulnerabilities that affect the Cisco ASA. That advisory is available at:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130410-asa

Affected Products

Cisco Firewall Service Module Software for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers is affected by multiple vulnerabilities. Affected versions of Cisco FWSM Software will vary depending on the specific vulnerability. Consult the "Software Versions and Fixes" section of this security advisory for more information about the affected versions.

Vulnerable Products

FWSM HTTP Proxy Traceback Vulnerability

A Cisco FWSM is affected by this vulnerability when running an affected version of Cisco FWSM Software with the auth-proxy feature configured.  The auth-proxy feature is not enabled by default.  See the "Details" section for information on determining whether a device has a vulnerable configuration.

IKE Version 1 Denial of Service Vulnerability

A Cisco FWSM is affected by this vulnerability if IKE version 1 is enabled.  IKE is not enabled by default.  See the "Details" section for information on determining whether a device has a vulnerable configuration.
Note: IKE on the FWSM is supported only for remote administration, not for remote network access. 

Products Confirmed Not Vulnerable

With the exception of Cisco ASA software, no other Cisco products are currently known to be affected by these vulnerabilities.

Details

FWSM HTTP Proxy Traceback Vulnerability

The auth-proxy feature in Cisco Firewall Services Module (FWSM) Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a reload of an affected device.

The vulnerability is due to incorrect processing of URLs when clients are making requests through the auth-proxy feature.  A Cisco FWSM is affected by this vulnerability when running an affected version of Cisco FWSM Software with the auth-proxy feature configured.  The auth-proxy feature is enabled if the configuration contains one or more of the the following commands:
aaa authentication {include | exclude} service  interface_name inside_ip inside_mask [outside_ip outside_mask] {server_tag | LOCAL}

or

aaa authentication match acl_name  interface_name {server_tag | LOCAL}

The auth-proxy feature is not enabled by default.  See the Cisco FWSM configuration guide for more examples http://www.cisco.com/en/US/docs/security/fwsm/fwsm31/configuration/guide/fwaaa_f.html
This vulnerability is described in Cisco bug ID CSCtg02624 ( registered customers only) and has been assigned CVE ID CVE-2013-1155.

IKE Version 1 Denial of Service Vulnerability

Note: IKE on the Cisco FWSM is supported only for remote administration, not for remote network access. 

A Cisco FWSM is affected by this vulnerability if IKE version 1 is enabled. IKE version 1 is enabled if the command isakmp enable <interface name> is configured

IKE is not enabled by default.

This vulnerability is described in Cisco bug ID CSCud20267 (registered customers only) and has been assigned CVE ID CVE-2013-1149.

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


CSCtg02624 - FWSM HTTP Proxy Traceback Vulnerability

Calculate the environmental score of CSCtg02624

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




CSCud20267 - IKE Version 1 Denial of Service Vulnerability

Calculate the environmental score of CSCud20267

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 either of these vulnerabilities may result in a reload of an affected device, leading to a DoS condition.

Software Versions and Fixes

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

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

The following table lists fixed and recommended versions to remediate the FWSM HTTP Proxy Traceback Vulnerability:

 Major Release
First Fixed Release
 Recommended Release
 3.1  Affected; Migrate to 3.2
Migrate to 3.2
 3.2  3.2(20.1) 3.2(25)
 4.0 4.0(15.2)
Migrate to 4.1
 4.1  4.1(5.1) 4.1(12)

The following table lists fixed and recommended versions to remediate the IKE Version 1 Denial of Service Vulnerability:

 Major Release
First Fixed Release
 Recommended Release
 3.1  Affected; Migrate to 3.2
Migrate to 3.2
 3.2  3.2(24.1) 3.2(25)
 4.0 Affected; Migrate to 4.1
Migrate to 4.1
 4.1 4.1(11.1)
4.1(12)

Software Download

Cisco FWSM Software can be downloaded from the Software Center on Cisco.com by visiting http://www.cisco.com/cisco/software/navigator.html


For the Cisco Catalyst 6500 Series Firewall Services Module, navigate to Products > Security > Firewalls > Firewall Integrated Switch/Router Services >Cisco Catalyst 6500 Series Firewall Services Module > Firewall Services Module (FWSM) Software.

Workarounds

Administrators can mitigate the  IKE Version 1 Denial of Service Vulnerability by disabling VPN access for administration and instead using SSH or HTTPS for administration.

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.

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 vulnerabilities that are described in this advisory.

These vulnerabilities were discovered during troubleshooting of customer issues.

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-20130410-fwsm

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 2013-April-10 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.