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Cisco IP Phone 7940 SIP INVITE Denial of Service Vulnerability Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA27898  
Release Date: 2007-12-06
Last Update: 2007-12-18

Critical:
Less critical
Impact: DoS
Where: From remote
Solution Status: Unpatched

Software:Cisco IP Phone 7940

CVE reference:CVE-2007-5583 (Secunia mirror)
CVE-2007-6370 (Secunia mirror)

This advisory is currently marked as unpatched!
- Companies can be alerted when a patch is released!


Description:
The Madynes research team has reported a vulnerability in Cisco IP Phone 7940, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to the improper handling of SIP INVITE messages. This can be exploited to deny legitimate calls or to reboot the device by sending a series of SIP INVITE messages containing a "Request-URI" without a username.

Successful exploitation requires knowledge of a valid userid on the target phone.

NOTE: The vendor reportedly could not confirm a device reboot via SIP INVITE messages and states that a device is not affected when registered with a Cisco Unified Communications Manager (CUCM) server.

The vulnerability is reported in firmware version P0S3-08-7-00. Other versions may also be affected.

Solution:
Restrict network access to the vulnerable device.

Provided and/or discovered by:
Madynes research team at INRIA Lorraine.

Changelog:
2007-12-10: Added CVE reference. Updated "Description" section.
2007-12-18: Added CVE reference.

Original Advisory:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-December/058837.html



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

5 Related Secunia Security Advisories

1. Cisco Unified IP Phone Multiple Vulnerabilities
2. Cisco IP Phone 7940/7960 SIP Message Sequence Denial of Service
3. Cisco IP Phone 7940/7960 SIP INVITE Denial of Service Vulnerability
4. Cisco IP Phones SYN Flood Device Reload Vulnerability
5. Cisco Session Initiation Protocol DoS


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