The CFNetwork Proxies component in Apple iOS before 9 does not properly handle a Set-Cookie header within a response to an HTTP CONNECT request, which allows remote proxy servers to conduct cookie-injection attacks via a crafted response.
lists.apple.com/archives/security-announce/2015/Sep/msg00001.html
lists.apple.com/archives/security-announce/2015/Sep/msg00005.html
lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
www.securityfocus.com/bid/76764
www.securitytracker.com/id/1033609
support.apple.com/HT205212
support.apple.com/HT205213
support.apple.com/HT205267