full-disclosure - Bypassing the new /GS protection in VC++ 7.1

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Date: Fri Aug 19 05:38:37 2005
From: Valdis.Kletnieks at vt.edu (Valdis.Kletnieks@...edu)
Subject: Bypassing the new /GS protection in VC++ 7.1 

On Fri, 19 Aug 2005 12:17:25 +0800, leaf said:
> Hey,
> Buffer overflows will be harder and harder. Maybe game is over.

The game will never be over.  The best you can hope for is to find a
cost-effective way to raise the bar high enough to keep the likelyhood
that you'll get hacked down to an acceptable level.

Hint - the /GS code is based on an assumption regarding the behavior
of the code.  What is it assuming, and what possible end-runs can you
come up with? (For example, if the feature is based on a 'canary' value
remaining intact, you want to look for ways to totally overshoot the
canary and overlay something beyond it...)
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