CVE-2012-3553

chan_skinny.c en el controlador de canal de Skinny (alias SCCP) en Asterisk Open Source v10.x antes v10.5.1 permite a usuarios remotos autenticados provocar una denegación de servicio (eliminar la referencia del puntero NULL y caída demonio) mediante el envío de un mensaje Station Key Pad Button y el cierre de una conexión en modo descolgado, un tema relacionado con CVE-2012-2948.

AST-2012-008 previously dealt with a denial of service attack exploitable in the Skinny channel driver that occurred when certain messages are sent after a previously registered station sends an Off Hook message. Unresolved in that patch is an issue in the Asterisk 10 releases, wherein, if a Station Key Pad Button Message is processed after an Off Hook message, the channel driver will inappropriately dereference a Null pointer. Similar to AST-2012-008, a remote attacker with a valid SCCP ID can can use this vulnerability by closing a connection to the Asterisk server when a station is in the "Off Hook" call state and crash the server.