Safari in Apple iOS before 6 does not properly restrict use of an unspecified Unicode character that looks similar to the https lock indicator, which allows remote attackers to spoof https connections by placing this character in the TITLE element of a web page.
https://exchange.xforce.ibmcloud.com/vulnerabilities/78708
http://support.apple.com/kb/HT5503
http://lists.apple.com/archives/security-announce/2012/Sep/msg00003.html