Published: 02 June 2012
chan_skinny.c in the Skinny (aka SCCP) channel driver in Certified Asterisk 1.8.11-cert before 1.8.11-cert2 and Asterisk Open Source 1.8.x before 126.96.36.199 and 10.x before 10.4.1 allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) by closing a connection in off-hook mode. A remote attacker with a valid SCCP ID can can use this vulnerability by closing a connection to the Asterisk server in certain call states (e.g. "Off hook") to crash the server. Successful exploitation of this vulnerability would result in termination of the server, causing denial of service to legitimate users.