Asterisk Open Source 11.x before 11.10.1 and 12.x before 12.3.1 and Certified Asterisk 11.6 before 11.6-cert3 allows remote authenticated Manager users to execute arbitrary shell commands via a MixMonitor action.
http://www.securityfocus.com/archive/1/532419/100/0/threaded
http://packetstormsecurity.com/files/127088/Asterisk-Project-Security-Advisory-AST-2014-006.html
http://downloads.asterisk.org/pub/security/AST-2014-006.html