Symantec LiveUpdate Administrator before 2.3.1 uses weak permissions (Everyone: Full Control) for the installation directory, which allows local users to gain privileges via a Trojan horse file.
http://www.securitytracker.com/id?1027182
http://www.securityfocus.com/bid/53903
http://www.nessus.org/plugins/index.php?view=single&id=59193