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

Vulnerability Note VU#430969

Original Release Date: 2007-02-16 | Last Revised: 2007-02-22

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.

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.

Impact

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

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.

Vendor Information

430969
 
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Cisco Systems, Inc. Affected

Updated:  February 16, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please see Cisco Security Advisory cisco-sa-20070214-fwsm for futher details.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


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References

Acknowledgements

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

This document was written by Katie Steiner.

Other Information

CVE IDs: CVE-2007-0961
Severity Metric: 12.60
Date Public: 2007-02-14
Date First Published: 2007-02-16
Date Last Updated: 2007-02-22 14:15 UTC
Document Revision: 11

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