March 2007

ID: 97
Ref: 039/2007
Date: 21 March 2007:11:10:37
Version: 1

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Title: CISCO Phone 7940 DOS vulnerability
Abstract: Security advisory concerning Cisco IP Phone 7940/7960 SIP firmware version7.4 which is vulnerable to a denial of service.
Vendors affected: Cisco
Applications affected: Cisco

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Document ID: 87392


http://www.cisco.com/warp/public/707/cisco-sr-20070320-sip.shtml

Revision 1.0

For Public Release 2007 March 20 2230 UTC (GMT)

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Cisco Response
==============

This is Cisco PSIRT's response to the statements made by Radu State in his message titled:

CISCO Phone 7940 DOS vulnerability

posted on 2007 March 20 0630 UTC (GMT).

The original email is available at:

http://lists.grok.org.uk/pipermail/full-disclosure/2007-March/053070.html

Cisco has confirmed the findings of the statements made. Cisco IP Phone 7940/7960 SIP firmware version 7.4(0) is vulnerable to the denial of service. Firmware version 8.6(0) is not vulnerable to this issue. The latest firmware images for Cisco IP 7940/7960 phones can be obtained here:

http://www.cisco.com/pcgi-bin/tablebuild.pl/sip-ip-phone7960

We would like to thank Radu State, Humberto J. Abdelnur and Olivier Festor of the Madynes research team at INRIA for reporting these issues to Cisco Systems.

We greatly appreciate the opportunity to work with researchers on security vulnerabilities, and welcome the opportunity to review and assist in product reports.

Additional Information
======================

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.

Revision History
================

+---------------------------------------+
| Revision | | Initial |
| 1.0 | 2007-March-20 | public |
| | | release. |
+---------------------------------------+

Cisco Security Procedures
=========================

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.
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CPNI values your feedback.

1. Which of the following most reflects the value of the advisory to you?
(Place an 'X' next to your choice)

Very useful:__ Useful:__ Not useful:__

2. If you did not find it useful, why not?


3. Any other comments? How could we improve our advisories?


Thank you for your contribution.
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CPNI wishes to acknowledge the contributions of Cisco for the information contained in this advisory.
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