Apple OS X before 10.11 does not ensure that the keychain's lock state is displayed correctly, which has unspecified impact and attack vectors.
https://support.apple.com/HT205267
http://www.securitytracker.com/id/1033703
http://www.securityfocus.com/bid/76908
http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html