The Sorenson codec in QuickTime in Apple Mac OS X before 10.7.5, and in CoreMedia in iOS before 6, accesses uninitialized memory locations, which allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted movie file with Sorenson encoding.
https://exchange.xforce.ibmcloud.com/vulnerabilities/78715
http://support.apple.com/kb/HT5503
http://support.apple.com/kb/HT5501
http://lists.apple.com/archives/security-announce/2012/Sep/msg00004.html
http://lists.apple.com/archives/security-announce/2012/Sep/msg00003.html