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Re: 2x 0day Microsoft Windows Excel
From: "ad () heapoverflow com" <ad () heapoverflow com>
Date: Sun, 08 Jan 2006 16:10:16 +0100

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after many hours working on excel I have found a
critical excel bug exploitable. This is not a stack bof
nor a heap bof , a bug extremely hard to find and trigger , but it
conduct excel to execute any arbitrary codes while opening a malicious
.xls file.

note: the bug isn't related to both excel dos that I have already
published but shows similiar to a null pointer bug at a first look.
much infos won't be disclosed publicly or privately and this will be
transmitted to ms before the spyware loosers catch it :)

I have said so this is only null pointer bugs but the way I trigger
the bug might be modded for a remote code execution who know , I'm
not a guru and maybe did an error triggering the flaw who knows :)
but I bet many are already reasearching on this hehe, happy job!



Let's go on the fast publishing :) I wont bother to message
microsoft about this because they wont patch it for sure according
that they can't patch fully exploitable bugs in a decent time, they
do not patch IE dos (http://heapoverflow.com/IEcrash.htm), so no
way to bother them, we should let them sleep a bit shhh ;)

Bugs 1 and Bugs 2 are quite similiar but NOT, both are null pointer
bugs . In bug1 you should mod a grafic's pointer to point to a bad
area, and in bug 2 you should null out the size of the page name.


attached are the 2 pocs, nor here are direct links


http://heapoverflow.com/excelol/bug1.xls
<http://heapoverflow.com/excelol/bug1.xls>
http://heapoverflow.com/excelol/bug2.xls
<http://heapoverflow.com/excelol/bug2.xls>



Credits:

AD [at] heapoverflow.com
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