CVE-2005-2751
memberd in Mac OS X 10.4 up to 10.4.2, in certain situations, does not quickly synchronize access control checks with changes in group membership, which could allow users to access files and other resources after they have been removed from a group.
Date published : 2005-11-01
http://lists.apple.com/archives/security-announce/2005/Oct/msg00000.html