Firefox onUnload + document.write() memory corruption vulnerability (MSIE7 null ptr) Feb 23 2007 01:36AM
Michal Zalewski (lcamtuf dione ids pl)
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:


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