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TITLE:
Asterisk Skinny Channel Driver Denial of Service

SECUNIA ADVISORY ID:
SA26340

VERIFY ADVISORY:
http://secunia.com/advisories/26340/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Asterisk 1.x
http://secunia.com/product/2155/
Asterisk Appliance Developer Kit 0.x
http://secunia.com/product/14821/

DESCRIPTION:
A vulnerability has been reported in Asterisk, which can be exploited
by malicious users to cause a DoS (Denial of Service).

The vulnerability is caused due to the Skinny channel driver
(chan_skinny) improperly processing packets. This can be exploited to
crash the application by sending a "CAPABILITIES_RES_MESSAGE" packet
with the capabilities count greater than the total number of items in
the "capabilities_res_message" array.

The vulnerability is reported in the following versions:
Asterisk Open Source 1.4.x, versions prior to 1.4.10
AsteriskNOW pre-release, versions prior to beta7
Asterisk Appliance Developer Kit, versions prior to 0.7.0
s800i versions prior to 1.0.3.

SOLUTION:
Asterisk Open Source 1.4.x:
Update to version 1.4.10.
http://downloads.digium.com/pub/telephony/asterisk

AsteriskNOW pre-release:
Update to version beta7.
http://www.asterisknow.org/

Asterisk Appliance Developer Kit:
Update to version 0.7.0.
http://downloads.digium.com/pub/telephony/aadk

s800i:
Update to version 1.0.3.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Wei Wang of McAfee AVERT Labs.

ORIGINAL ADVISORY:
http://downloads.digium.com/pub/asa/ASA-2007-019.pdf

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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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