iOS 4.3.4 slams cell door shut on untethered jailbreaks via PDF vulnerability

Sorry jailbreakers: Apple has made life harder for you once again with the release of iOS 4.3.4 (or iOS 4.2.9 for Verizon iPhone). Friday's update to iOS was released specifically to address a security vulnerability related to the viewing of malicious PDF files, which had been used to enable jailbreaks under the latest public version of iOS.

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