Re: Microsoft Windows XP/2003/Vista memory corruption 0day

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_at_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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Received on Dec 21 2006