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Re: [Full-disclosure] Microsoft Windows XP/2003/Vista memory corruption

from [Pukhraj Singh] Network Security [Permanent Link]
Subject: Re: [Full-disclosure] Microsoft Windows XP/2003/Vista memory corruption 0day
Date: Thu, 21 Dec 2006 15:17:14 -0700 
Holy mackerel! Instances of this bug date back to 1999!

http://groups.google.ca/group/microsoft.public.win32.programmer.kernel/browse_thread/thread/c5946bf40f227058/7bd7b5d66a4e5aff

--Pukhraj

On 12/21/06, Alexander Sotirov <asotirov@determina.com> wrote: 
3APA3A wrote:
> Killer{R}  assumes  the problem is in strcpy(), because it should not be
> used for overlapping buffers, but at least ANSI implementation of strcpy
> from  Visual  C  should be safe in this very situation (copying to lower
> addresses).  May be code is different for Windows XP or vulnerability is
> later in code.

We discovered this bug some time ago and were preparing an advisory when it was
publicly disclosed. Since the exploit is already public, here's my analysis of
the vulnerability:

http://www.determina.com/security.research/vulnerabilities/csrss-harderror.html

It's a double free bug that leads to arbitrary code execution in the CSRSS 
process.

Alex

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