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TITLE:
Cisco IP Phone 7940 SIP Message Sequence Denial of Service

SECUNIA ADVISORY ID:
SA26547

VERIFY ADVISORY:
http://secunia.com/advisories/26547/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

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

DESCRIPTION:
The Madynes research team at INRIA Lorraine has reported some
vulnerabilities in Cisco IP Phone 7940, which can be exploited by
malicious people to cause a DoS (Denial of Service).

The vulnerabilities are caused due to errors within the handling of
certain SIP message sequences. These can be exploited to reboot the
device by sending a series of specially crafted SIP messages.

The vulnerabilities are reported in firmware version POS3-08-6-00.

SOLUTION:
Use only in a trusted network environment.

PROVIDED AND/OR DISCOVERED BY:
Madynes research team at INRIA Lorraine

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-August/065401.html
http://lists.grok.org.uk/pipermail/full-disclosure/2007-August/065402.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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