manager.c in the Manager Interface in Asterisk Open Source 1.4.x before 1.4.40.1, 1.6.1.x before 1.6.1.25, 1.6.2.x before 1.6.2.17.3, and 1.8.x before 1.8.3.3 and Asterisk Business Edition C.x.x before C.3.6.4 does not properly check for the system privilege, which allows remote authenticated users to execute arbitrary commands via an Originate action that has an Async header in conjunction with an Application header.
http://www.vupen.com/english/advisories/2011/1188
http://www.vupen.com/english/advisories/2011/1107
http://www.vupen.com/english/advisories/2011/1086
http://www.securityfocus.com/bid/47537
http://www.debian.org/security/2011/dsa-2225
http://securitytracker.com/id?1025433
http://secunia.com/advisories/44529
http://secunia.com/advisories/44197
http://openwall.com/lists/oss-security/2011/04/22/6
http://lists.fedoraproject.org/pipermail/package-announce/2011-May/059702.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/058922.html