About 2 week ago, I discovered an open url redirection vulnerability in Facebook that allowed me to have a facebook.com link redirect to any website without restrictions & users confirmation Description: [#] Title : Facebook Open URL Redirection [#] Status : fixed [#] Severity : High [#] Works on : Any browser with any version [#] Homepage : www.facebook.com [#] Author : Jitendra Jaiswal ( India ) The flaw exists in the way facebook handled the u parameter. Visiting the link below would always redirect to the facebook homepage: http://www.facebook.com/a.php?u=http%3A%2F%2Fjeet.com But I noticed that changing the url to a another url , for example: http://www.facebook.com/a.php?u=http%3A%2F%2Fyahoo.com in that the target destination yahoo.com and it will redirect successfully: http://www.facebook.com/a.php?u=http%3A%2F%2Fyahoo.com Facebook have the ability to filter and ban particular websites from redirect
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