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TITLE:
Asterisk IAX2 User Authentication Denial of Service

SECUNIA ADVISORY ID:
SA32956

VERIFY ADVISORY:
http://secunia.com/advisories/32956/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

SOFTWARE:
Asterisk 1.x
http://secunia.com/advisories/product/2155/
Asterisk Business Edition 2.x
http://secunia.com/advisories/product/14820/

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 within the IAX2
implementation when handling realtime IAX2 users. This can be
exploited to crash the Asterisk server by e.g. trying to authenticate
as unknown user or as user using hostname matching.

The vulnerability is reported in Asterisk Open Source 1.2.26 through
1.2.30.3 and Asterisk Business Edition B.2.3.5 through B.2.5.5.

SOLUTION:
Asterisk Open Source:
Update to version 1.2.30.4.

Asterisk Business Edition:
Update to version B.2.5.6.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Jon Leren Schøpzinsky.

ORIGINAL ADVISORY:
AST-2008-012:
http://downloads.digium.com/pub/security/AST-2008-012.html

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