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TITLE:
Asterisk "pedantic" SIP Processing Denial of Service

SECUNIA ADVISORY ID:
SA30517

VERIFY ADVISORY:
http://secunia.com/advisories/30517/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Asterisk 1.x
http://secunia.com/product/2155/
Asterisk Business Edition 2.x
http://secunia.com/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 a NULL-pointer dereference error
in the "ast_uri_decode()" function. This can be exploited to crash
the application via a SIP message lacking a "From" field.

Successful exploitation requires that "pedantic" processing is
enabled.

The vulnerability is reported in the following products:
* Asterisk Open Source 1.0.x (all versions)
* Asterisk Open Source 1.2.x (all versions prior to 1.2.29)
* Asterisk Business Edition A.x.x (all versions)
* Asterisk Business Edition B.x.x (all versions prior to B.2.5.3)

SOLUTION:
Asterisk Open Source:
Update to version 1.2.29.

Asterisk Business Edition:
Update to version B.2.5.3.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Hooi Ng.

ORIGINAL ADVISORY:
http://downloads.digium.com/pub/security/AST-2008-008.html

http://bugs.digium.com/view.php?id=12607

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About:
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http://secunia.com/about_secunia_advisories/


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