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Not webkit, but Preview
honeymonster Updated - 6th Aug 2010
@Luke Skywalker

On of the bugs (there's actually two involved in the jailbreak exploit) is in Apples own PDF viewer (named Preview ). And there is indeed reason to believe that OS X may be vulnerable as well, as it is essentially the same code.

Incidently, the bug is in Apple Preview - which is used for displaying PDF files. It has nothing to do with webkit. If you are using Firefox on OS X you are also vulnerable, since FF will also invoke Preview to display PDFs.

Neither FireFox nor Safari uses a sandbox. Chrome and IE does. But I really don't know if Chrome executes Preview inside of its sandbox (on Windows, Chrome does not execute Flash in a sandbox - unlike IE).
ie8 fix

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ie8 fix