WebKit in Apple iOS before 9 allows man-in-the-middle attackers to conduct redirection attacks by leveraging the mishandling of the resource cache of an SSL web site with an invalid X.509 certificate.
https://support.apple.com/HT205212
http://www.securitytracker.com/id/1033609
http://www.securityfocus.com/bid/76766
http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html