asterisk -- Remote Crash Vulnerability in WebSocket Server

The 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.