Keychain Access in Mac OS X 10.4.2 and earlier keeps a password visible even if a keychain times out while the password is being viewed, which could allow attackers with physical access to obtain the password.
Unknown vulnerability in loginwindow in Mac OS X 10.4.2 and earlier, when Fast User Switching is enabled, allows attackers to log into other accounts if they know the passwords to at least two accounts.
The Finder in Mac OS X and earlier allows local users to overwrite arbitrary files and gain privileges by creating a hard link from the .DSStore file to an arbitrary file.