full-disclosure - Re: Exploit for MS06-040 Out?

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Message-Id: <200608111009.01818.fdlist@digitaloffense.net>
Date: Fri, 11 Aug 2006 10:09:01 -0500
From: H D Moore <fdlist@...italoffense.net>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Exploit for MS06-040 Out?

The DLLs for XP SP2 and 2003 SP1 were compiled with Visual Studio's stack 
protection flag (/GS). This prevents a standard return address overwrite 
from working. The wcscpy() method everyone is using in their exploits is 
also blocked by another change in how the compiler orders and passes 
arguments.  The standard way to bypass /GS is to use a SEH ptr overwrite, 
but so far, it doesn't seem possible to reach a SEH ptr with the 
overflow, when using the PathCanonicalize method. 

On Friday 11 August 2006 08:40, Brendan Dolan-Gavitt wrote:
> Is there any technical reason that an exploit cannot be developed
> against XP SP2 and Server 2003 SP1? Or is this only a limitation of
> the current Metasploit exploit?

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