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)
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Subject: Asterisk "pedantic" SIP Processing Denial of Service
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