Bug: Firefox onUnload + document.write() memory corruption vulnerability (MSIE7 null ptr) ( Ascii Version )

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

Published
Credit
Risk
2007.02.28
Michal Zalewski
High
CWE
CVE
Local
Remote
N/A
CVE-2007-1094
CVE-2007-1092
No
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):

http://lcamtuf.coredump.cx/ietrap/testme.html

This also crashes MSIE7 with a seemingly harmless NULL pointer bug (didn't
research it - do your homework).

Firefox problem is being tracked here:
https://bugzilla.mozilla.org/show_bug.cgi?id=371321

/mz

See this note in TXT Version

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Ascii Version