bugtraq - Re: Magic iso heap over flow <Help>

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Date: 23 May 2007 10:23:32 -0000
From: c0ntexb@...il.com
To: bugtraq@...urityfocus.com
Subject: Re: Magic iso heap over flow <Help>

"Im looking for help in writing a simple poc  for service pack 2 xp as i know we cant use!peb method with sp2 im looking for a better way any hellp would be great."

What is the instruction that it crashes on? this is the important part, not always so much 'what' you write but 'how' you overwrite.

If it is something like:

MOV DWORD PTR DS:[ECX],EAX
MOV DWORD PTR DS:[EAX+4],ECX

then you have a bunch of stuff to play with and exploitation should be a piece of cake, overwrite some pointer for example. Otherwise it might well be a little trickier but from what you post it looks pretty good.

Anyway, paste where it crashes in the assembler.

regards,
c0ntex