For those who had Jailbreak their iPads or iPhone with Jailbreakme.com, you might want to hear this news. Apparently, the PDF hole is back in iOS 4.3.3. That means some code could reside in PDF file and tunnel into your iPad or iPhone iOS.
Based on the information, it might be the same loophole previously. And it seems that iOS 4.3.4 might be able to patch this hole. In other words, if it can patch this hole, Jailbreakme.com might not work anymore.
In any case, if you are on iOS 4.3.3, do take caution on suspicious PDF files.
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