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Secunia integrated with Microsoft WSUS 
http://secunia.com/blog/71/



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TITLE:
Asterisk T.38 Negotiation Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA38395

VERIFY ADVISORY:
http://secunia.com/advisories/38395/

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 when negotiating T.38
over SIP and can be exploited to cause Asterisk to crash by sending a
specially crafted SDP packet containing a "FaxMaxDatagram" field with
a negative or overly-large value, or a SDP packet without a
"FaxMaxDatagram" field.

The vulnerability is reported in the following versions:
* Asterisk Open Source 1.6.x (all versions)
* Asterisk Business Edition C.3 (all versions)

SOLUTION:
Update to the fixed versions or apply the patches.

Asterisk Open Source 1.6.x:
Update to version 1.6.0.22, 1.6.1.14, or 1.6.2.2

Asterisk Business Edition C3:
Update to C.3.3.2.

Patches:
Asterisk Open Source 1.6.0 Branch:
http://downloads.asterisk.org/pub/security/AST-2010-001-1.6.0.diff

Asterisk Open Source 1.6.1 Branch:
http://downloads.asterisk.org/pub/security/AST-2010-001-1.6.1.diff

Asterisk Open Source 1.6.2 Branch:
http://downloads.asterisk.org/pub/security/AST-2010-001-1.6.2.diff

PROVIDED AND/OR DISCOVERED BY:
The vendor credits bklang and elsto.

ORIGINAL ADVISORY:
http://downloads.asterisk.org/pub/security/AST-2010-001.html

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