WebKit in Apple iOS before 4 on the iPhone and iPod touch does not enforce the expected boundary restrictions on content display by an IFRAME element, which allows remote attackers to spoof the user interface via a crafted HTML document.
http://www.vupen.com/english/advisories/2011/0212
http://www.securityfocus.com/bid/41068
http://www.securityfocus.com/bid/41016
http://support.apple.com/kb/HT4456
http://support.apple.com/kb/HT4225
http://secunia.com/advisories/43068
http://secunia.com/advisories/42314
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
http://lists.apple.com/archives/security-announce/2010/Jun/msg00003.html
http://lists.apple.com/archives/security-announce/2010//Nov/msg00003.html