Format string vulnerability in Asterisk Open Source 1.6.x before 1.6.0-beta6 might allow remote attackers to execute arbitrary code via logging messages that are not properly handled by (1) the ast_verbose logging API call, or (2) the astman_append function.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41301
http://www.vupen.com/english/advisories/2008/0928
http://www.securityfocus.com/bid/28311
http://www.securityfocus.com/archive/1/489823/100/0/threaded
http://www.debian.org/security/2008/dsa-1525
http://www.asterisk.org/node/48466
http://securitytracker.com/id?1019630
http://secunia.com/advisories/29456