Firefox onUnload + document.write() memory corruption vulnerability (MSIE7 null ptr)

Risk: High
Local: No
Remote: Yes

While researching my previous report on MSIE7 browser entrapment, I noticed that Firefox is susceptible to a pretty nasty, and apparently easily exploitable memory corruption vulnerability. When a location transition occurs and the structure of a document is modified from within onUnload event handler, freed memory structures are left in inconsistent state, possibly leading to a remote compromise. A quick test case that crashes while trying to follow partly user-dependent corrupted pointers near valid memory regions (can be forced to write, too): This also crashes MSIE7 with a seemingly harmless NULL pointer bug (didn't research it - do your homework). Firefox problem is being tracked here: /mz

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