Buffer overflow in iChat in Apple Mac OS X 10.3.9 and 10.4.9 allows remote attackers to cause a denial of service (application termination) and possibly execute arbitrary code via a crafted UPnP Internet Gateway Device (IGD) packet.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34502
http://www.vupen.com/english/advisories/2007/1939
http://www.securitytracker.com/id?1018119
http://www.securityfocus.com/bid/24144
http://www.kb.cert.org/vuls/id/116100
http://secunia.com/advisories/25402
http://lists.apple.com/archives/security-announce/2007/May/msg00004.html