The IOS 5.1.1 addresses the vulnerability that could make Spoofing in Safari
IOS 5.1.1, A few months ago came a story about a bug that allowed to spoofing in IOS 5. With the new iPhone OS 5.1.1 update from Apple fixes the serious security problem that was in Safari.
This bug was discovered in March this year and I did was that when they open a new tab, your browser see your URL in the address bar but in reality the page that is not what you put into it, so can be tricked into giving bank details or passwords.
IOS 5.1.1, But good as this does not happen that the new update fixes this bug.