full-disclosure - RE: Remote overflow in MSIE script action handlers (mshtml.dll)

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Message-ID: <7F8D34CE462F6D419ACF275E5A72FAEB0121B905@dps-exch.dps.ohio-state.edu>
Date: Fri Mar 17 15:42:15 2006
From: schenz.9 at dps.ohio-state.edu (David Schenz)
Subject: RE: Remote overflow in MSIE script action
	handlers (mshtml.dll)

Tested on Win2k3 Standard, fully patched... 

Mshtml.dll 6.0.3790.2577
Iexplore.exe 6.0.3790.1830

PoC does work.

David Schenz
schenz.9@....edu

-----Original Message-----
From: Michal Zalewski [mailto:lcamtuf@...ne.ids.pl] 
Sent: Thursday, March 16, 2006 4:14 PM
To: Daniel Bonekeeper
Cc: bugtraq@...urityfocus.com; vulnwatch@...nwatch.org;
full-disclosure@...ts.grok.org.uk
Subject: Re: Remote overflow in MSIE script action handlers (mshtml.dll)

On Thu, 16 Mar 2006, Daniel Bonekeeper wrote:

> BTW, tested the POC on MSIE (File Version = 6.00.2900.2180
> (xpsp_sp2_rtm.040803-2158)) with mshtml.dll (6.00.2900.2802
> (xpsp_sp2_gdr.051123-1230)) and it didn't worked.

Daniel followed up with me in private and confirmed that the PoC *did*
work for him when he followed certain additional instructions: because
the
attack depends on memory layout and usage, to get consistent results, be
sure to close *all* MSIE windows, then go to Start -> Run... and type:

  iexplore http://lcamtuf.coredump.cx/iedie.html

That should crash the browser immediately, because there are no other
buffers nearby to "absorb" the initial fencepost. Still, if no dice, try
hitting 'Reload' a couple of times.

/mz