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Re: [Full-disclosure] Microsoft Windows XP/2003/Vista memory corruption 0day

From: Alexander Sotirov (asotirovdetermina.com)
Date: Thu Dec 21 2006 - 14:11:29 CST

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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