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.
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Subject: Asterisk IAX2 Call Number Exhaustion Denial of Service
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