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 the library's implementation of a FrameOwner element. When building this tree, the application will create a duplicate reference of an element. By freeing the referenced element, a use-after-free condition can be made to occur which can lead to code execution under the context of the application.
Patch Availability:
Apple has issued an update to correct this vulnerability. More details can be found at: http://support.apple.com/kb/HT4808
