Integer overflow in Apple QuickTime before 7.7.2 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted sean atom in a movie file.
http://lists.apple.com/archives/security-announce/2012/May/msg00005.html
http://lists.apple.com/archives/security-announce/2012/Sep/msg00004.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16111
http://support.apple.com/kb/HT5261