The FSFindFolder API in CarbonCore in Apple Mac OS X before 10.6.7 provides a world-readable directory in response to a call with the kTemporaryFolderType flag, which allows local users to obtain potentially sensitive information by accessing this directory.
http://support.apple.com/kb/HT4581
http://lists.apple.com/archives/security-announce/2011/Mar/msg00006.html