CVE-2009-0151
The screen saver in Dock in Apple Mac OS X 10.5 before 10.5.8 does not prevent four-finger Multi-Touch gestures, which allows physically proximate attackers to bypass locking and "manage applications or use Expose" via unspecified vectors.
Date published : 2009-08-06
http://lists.apple.com/archives/security-announce/2009/Aug/msg00001.html