Asterisk "pedantic" SIP Processing Denial of Service
Secunia Advisory: SA30517
Release Date: 2008-06-04
Popularity: 2,231 views

Critical:
Moderately critical
Impact: DoS
Where: From remote
Solution Status: Vendor Patch

Software:Asterisk 1.x
Asterisk Business Edition 2.x

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CVE reference:CVE-2008-2119


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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