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TITLE:
Asterisk RTP Comfort Noise Payload Denial of Service

SECUNIA ADVISORY ID:
SA37530

VERIFY ADVISORY:
http://secunia.com/advisories/37530/

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

The vulnerability is caused due to an error in the handling of RTP
comfort noise payloads. This can be exploited to cause a crash by
sending an RTP comfort noise payload containing a data length of 24
bytes or greater.

SOLUTION:
Asterisk Open Source:
Update to version  1.2.37, 1.4.27.1, 1.6.0.19, or 1.6.1.11 or apply
patches.
http://downloads.asterisk.org/pub/security/AST-2009-010-1.2.diff.txt
http://downloads.asterisk.org/pub/security/AST-2009-010-1.4.diff.txt
http://downloads.asterisk.org/pub/security/AST-2009-010-1.6.0.diff.txt
http://downloads.asterisk.org/pub/security/AST-2009-010-1.6.1.diff.txt

Asterisk Business Edition:
Update to version B.2.5.13, C.2.4.6, or C.3.2.3.

S800i (Asterisk Appliance):
Update to version 1.3.0.6.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits amorsen.

ORIGINAL ADVISORY:
http://downloads.asterisk.org/pub/security/AST-2009-010.html

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