User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.
The specific flaw exists within how QuickTime.qts parses a data handler in specific atom within a .mov file. The application will utilize a string length to copy data into an heap buffer, if the string is of zero-length, the application will fail to copy anything and then proceed to use the uninitialized buffer as a string.
Patch Availability:
Apple has issued an update to correct this vulnerability. More details can be found at: http://support.apple.com/kb/HT5002
