Apple has released a critical QuickTime media player update to fix a pair of gaping security holes that expose Windows users to code execution attacks.
The QuickTime 7.6.8 update, available for Windows 7, Windows Vista and Windows XP users, patches vulnerabilities that could be exploited in drive-by downloads (via rigged Web sites) and via booby-trapped image files.
- An input validation issue exists in the QuickTime ActiveX control. An optional parameter '_Marshaled_pUnk' may be passed to the ActiveX control to specify an arbitrary integer that is later treated as a pointer. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed by ignoring the '_Marshaled_pUnk' parameter. This issue does not affect Mac OS X systems.
- A path searching issue exists in QuickTime Picture Viewer. If an attacker places a maliciously crafted DLL in the same directory as an image file, opening the image file with QuickTime Picture Viewer may lead to arbitrary code execution. This issue is addressed by removing the current working directory from the DLL search path. This issue does not affect Mac OS X systems.