Vigil@nce - Asterisk: use after free via WebSocket Server
December 2014 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can force the usage of a freed memory area in
WebSocket Server of Asterisk, in order to trigger a denial of
service, and possibly to execute code.
Impacted products: Asterisk Open Source
Severity: 2/4
Creation date: 11/12/2014
DESCRIPTION OF THE VULNERABILITY
The Asterisk product offers a WebSocket Server service.
However, the res/res_http_websocket.c file frees a memory area
before reusing it.
An attacker can therefore force the usage of a freed memory area
in WebSocket Server of Asterisk, in order to trigger a denial of
service, and possibly to execute code.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/Asterisk-use-after-free-via-WebSocket-Server-15774