LaunchServices in Apple Mac OS X 10.4.x up to 10.4.1 does not properly mark file extensions and MIME types as unsafe if an Apple Uniform Type Identifier (UTI) is not created when the type is added to the database of unsafe types, which could allow attackers to bypass intended restrictions.
http://securitytracker.com/id?1014141
http://lists.apple.com/archives/security-announce/2005/Jun/msg00000.html