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2003: 2,700 advisories published
2004: 3,100 advisories published
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TITLE:
Cisco IP Phone 7940 SIP INVITE Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA27898

VERIFY ADVISORY:
http://secunia.com/advisories/27898/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Cisco IP Phone 7940
http://secunia.com/product/1113/

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.

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.

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

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About:
This Advisory was delivered by Secunia as a free service to help
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