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TITLE:
Cisco IP Phone 7940/7960 SIP INVITE Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA24600

VERIFY ADVISORY:
http://secunia.com/advisories/24600/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
Cisco IP Phone 7900 Series
http://secunia.com/product/2809/

SOFTWARE:
Cisco IP Phone 7940
http://secunia.com/product/1113/
Cisco IP Phones 7960
http://secunia.com/product/287/

DESCRIPTION:
A vulnerability has been reported in Cisco IP Phone 7940 and 7960,
which can be exploited by malicious people to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error within the handling of
certain SIP INVITE messages. This can be exploited to reboot the
device by sending a specially crafted INVITE message with a malformed
"sipURI" field of the Remote-Party-ID.

The vulnerability is reported in devices running firmware
POS3-07-4-00.

SOLUTION:
Reportedly, firmware POS8-6-0 is unaffected.

PROVIDED AND/OR DISCOVERED BY:
Humberto J. Abdelnur, Radu State, and Olivier Festor

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About:
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http://secunia.com/about_secunia_advisories/


Please Note:
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Secunia NEVER sends attached files with advisories.
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