Notification Center in Apple iOS before 9.1 mishandles changes to "Show on Lock Screen" settings, which allows physically proximate attackers to obtain sensitive information by looking for a (1) Phone or (2) Messages notification on the lock screen soon after a setting was disabled.
https://support.apple.com/HT205370
http://www.securitytracker.com/id/1033929
http://www.securityfocus.com/bid/77268
http://lists.apple.com/archives/security-announce/2015/Oct/msg00002.html