The bidirectional text-display and text-selection implementations in Terminal in Apple OS X before 10.11 interpret directional override formatting characters differently, which allows remote attackers to spoof the content of a text document via a crafted character sequence.
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