QuickTime in Apple Mac OS X before 10.8.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted idsc atom in a QuickTime movie file.
http://support.apple.com/kb/HT6151
http://support.apple.com/kb/HT5880
http://lists.apple.com/archives/security-announce/2013/Sep/msg00002.html