Vulnerability Note VU#430969

Cisco Firewall Services Module vulnerable to DoS via inspection of malformed SIP messages

Overview

Cisco Firewall Services Module fails to properly inspect SIP messages. This vulnerability may allow a remote attacker to cause a denial of service condition.

I. Description

The Cisco Firewall Services Module is an integrated firewall service for Cisco Catalyst 6500 series switches and Cisco 7600 series routers. This module fails to properly inspect SIP messages which may cause the system to crash. This vulnerability can be exploited when an attacker sends a specially crafted SIP message to the system.

Cisco states that SIP inspection is enabled by default in 2.x versions of the module.

II. Impact

A remote, unauthenticated attacker may be able to cause the system to crash.

III. Solution

Upgrade

Cisco states this issue has been addressed in 2.3(4.12) for the 2.3.x series, and 3.1(3.24) for the 3.x series. Please see Cisco Security Advisory cisco-sa-20070214-fwsm for further information.

Workaround

Disable deep packet inspection. Please see Cisco Security Advisory cisco-sa-20070214-fwsm for further information.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Cisco Systems, Inc.	Vulnerable	16-Feb-2007

References

http://www.cisco.com/warp/public/707/cisco-sa-20070214-fwsm.shtml
http://securitytracker.com/alerts/2007/Feb/1017650.html

Credit

Thanks to Cisco Systems Product Security Incident Response Team for reporting this vulnerability.

This document was written by Katie Steiner.

Other Information

Date Public:	2007-02-14
Date First Published:	2007-02-16
Date Last Updated:	2007-02-22
CERT Advisory:
CVE-ID(s):	CVE-2007-0961
NVD-ID(s):	CVE-2007-0961
US-CERT Technical Alerts:
Metric:	12.60
Document Revision:	9

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Produced 2007 by US-CERT, a government organization
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