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Topic :

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

SecurityAlert : 2302

CVE : CVE-2007-1094

CVE : CVE-2007-1092

SecurityRisk : High Security Risk High

(About)

Remote Exploit : Yes

Local Exploit : No

Exploit Given : Yes

Credit : Michal Zalewski

Published : 28.02.2007

Affected Software :

Mozilla Firefox 2.0.1

Advisory Text :

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

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