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 Webkit's layout implementation of an particular tag used for embedding a foreign document into the SVG namespace. Later when the application attempts to calculate layout information for rendering the contents of the tag, the application will attempt to access a linebox that was previously destroyed. Successful exploitation 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/HT4276
