FreeBSD : asterisk -- Remote Crash Vulnerability in WebSocket Server (94268da0-8118-11e4-a180-001999f8d30b)
Medium Nessus Plugin ID 79956
SynopsisThe remote FreeBSD host is missing a security-related update.
DescriptionThe Asterisk project reports :
When handling a WebSocket frame the res_http_websocket module dynamically changes the size of the memory used to allow the provided payload to fit. If a payload length of zero was received the code would incorrectly attempt to resize to zero. This operation would succeed and end up freeing the memory but be treated as a failure.
When the session was subsequently torn down this memory would get freed yet again causing a crash.
Users of the WebSocket functionality also did not take into account that provided text frames are not guaranteed to be NULL terminated.
This has been fixed in chan_sip and chan_pjsip in the applicable versions.
SolutionUpdate the affected package.