Double free vulnerability in the WebSocket Server (res_http_websocket module) in Asterisk Open Source 11.x before 11.14.2, 12.x before 12.7.2, and 13.x before 13.0.2 and Certified Asterisk 11.6 before 11.6-cert9 allows remote attackers to cause a denial of service (crash) by sending a zero length frame after a non-zero length frame.
advisories.mageia.org/MGASA-2015-0010.html
downloads.asterisk.org/pub/security/AST-2014-019.html
packetstormsecurity.com/files/129473/Asterisk-Project-Security-Advisory-AST-2014-019.html
seclists.org/fulldisclosure/2014/Dec/48
secunia.com/advisories/60251
www.mandriva.com/security/advisories?name=MDVSA-2015:018
www.securityfocus.com/archive/1/534197/100/0/threaded
www.securityfocus.com/bid/71607
www.securitytracker.com/id/1031345