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Asterisk IAX2 Call Number Exhaustion Denial of Service

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Release Date:  2009-09-04    Views:  3,737

Secunia Advisory SA36593

Where:

From local network

Impact:

DoS

Solution Status:

Vendor Patch

CVE Reference(s):

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 the call number field in a messages being handled as a fixed size 15 bit field. This can be exploited to exhaust all available call numbers via a large number of messages and prevent the handling of further sessions.

The vulnerability is reported in the following products and versions:
* Asterisk Open Source 1.2.x all versions
* Asterisk Open Source 1.4.x all versions
* Asterisk Open Source 1.6.x all versions
* Asterisk Business Edition B.x.x all versions
* Asterisk Business Edition C.x.x all versions
* s800i (Asterisk Appliance) 1.3.x all versions


Solution:
Update to the latest versions or apply patches, and consult the users guide section of the IAX2 Security document.

Further details available to Secunia VIM customers

Provided and/or discovered by:
The vendor credits:
* Noam Rathaus
* Blake Cornell

Original Advisory:
http://downloads.asterisk.org/pub/security/AST-2009-006.html

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Asterisk IAX2 Call Number Exhaustion Denial of Service

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