Some vulnerabilities have been reported in Asterisk, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerabilities are caused due to "sscanf()" being invoked without specifying a maximum width e.g. when processing SIP messages. This can be exploited to exhaust stack memory in the SIP stack network thread via overly long numeric strings in various fields of a message.
NOTE: According to the vendor this is only potentially exploitable in 1.6.1 and above.
The vulnerabilities are reported in the following products and versions:
* Asterisk Open Source 1.2.x versions prior to 1.2.34
* Asterisk Open Source 1.4.x versions prior to 184.108.40.206
* Asterisk Open Source 1.6.0.x versions prior to 220.127.116.11
* Asterisk Open Source 1.6.1.x versions prior to 18.104.22.168
* Asterisk Business Edition A.x.x versions
* Asterisk Business Edition versions prior to B.2.5.9
* Asterisk Business Edition C.2.x versions prior to C.2.4.1
* Asterisk Business Edition C.3.x versions prior to C.3.1
* s800i (Asterisk Appliance) 1.2.x versions prior to 22.214.171.124
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 email@example.com
Subject: Asterisk SIP Channel Driver Denial of Service
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