The Finder in DesktopServices in Apple Mac OS X 10.5.8, and 10.6 before 10.6.4, does not set the expected file ownerships during an "Apply to enclosed items" action, which allows local users to bypass intended access restrictions via normal filesystem operations.
http://lists.apple.com/archives/security-announce/2010//Jun/msg00001.html
http://secunia.com/advisories/40220
http://securitytracker.com/id?1024103
http://support.apple.com/kb/HT4188