Asterisk Crash Vulnerability In SIP Channel Driver When run in Pedantic Mode

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During Asterisk's pedantic SIP processing the From header value is passed to the ast_uri_decode function to be decoded. In two instances it is possible for the code to cause a crash as the From header value is not checked to be non-NULL before being passed to the function.

http://www.securiteam.com/securitynews/5SP0115OKC.html