Re: Microsoft Explorer Denial of Service

[Luca Ercoli <io () lucaercoli it>]

Are you sure that the same GIF vulnerability has already been discussed?
Those are the disclosures already posted:

- Windows XP explorer.exe heap overflow [http://www.securityfocus.com/archive/1/354783]:
   (A malformed .emf file can cause an exploitable heap overflow)
- Microsoft Internet Explorer Malformed GIF Double Free Code Execution Vulnerability [BID: 8530]


Do you see an heap overflow in my advisory?
Of course you know that "Microsoft Internet Explorer (iexplorer.exe)" is different from "Windows Program Manager 
(explorer.exe)".

Maybe that the same vulnerability has already posted, but i haven't found anything.
Please, help me, give me the link of the 'precedent' disclosure?





Best Regards,
Luca Ercoli







> on 04/06/2005 Des Ward net wrote:

> Is this the same GIF vuln that's already been talked about.
>
> Also, why not contact M$?
>
> I'm not against FD if conducted responsibly, but by not contacting the vendor you're
> acting in an irresponsible manner.


> > ----- original message-----
> > From: Luca Ercoli <io lucaercoli it>
> > Date: 6 Apr 2005 01:55:57 
> > To:bugtraq securityfocus com
> > Subject: Microsoft Explorer Denial of Service
> >
> >
> >
> > Package: Microsoft Explorer
> > Auth: http://www.microsoft.com/
> > Vulnerability: Denial of Service
> > System(s) affected:
> >
> > - Tested on Windows XP Home Edition [explorer 6.00.2800.1106 (xpsp1.020828-1920)]
> > - Windows 2000 seem to be not vulnerable.
> > - Vulnerability has not been tested on other versions of Microsoft Windows
> >
> >
> > Disclaimer:
> > ==========
> >
> > The information is provided "as is" without warranty of any kind.
> > The author of this issue shall not be held liable for any
> > downtime, lost profits, or damages due to the informations 
> > contained in this advisory.
> >
> >
> > Summary:
> > -------
> >
> > A vulnerability has been found in Microsoft Explorer (explorer.exe) for Windows XP,
> > which can be exploited by malicious user to compromise system stability
> > by consuming 99% CPU resources.
> >
> >
> > What causes the vulnerability?
> > -----------------------------
> >
> > A vulnerability has been discovered in the way that
> > Microsoft Explorer processes image's attributes for 
> > the GIF file type.
> >
> >
> >
> > Vulnerability Description:
> > -------------------------
> >
> > A specially crafted image can be used to exploit this security flaw,
> > that will be triggered by navigating into a directory which 
> > contains a malicious file (rarely, in order to exploit the vulnerability,
> > you must select the malicious image using the mouse or the keyboard).
> >
> >
> >
> > Exploit:
> > -------
> >
> > www.lucaercoli.it/MSExplorer/exploder.zip
> >
> >
> >
> > Vendor Status:
> > -------------
> >
> > The vendor has not been contacted
> >
> >
> >
> >
> >
> >
> > Credits:
> > -- 
> >
> > Luca Ercoli   <io [at] lucaercoli.it>
> >              http://www.lucaercoli.it

> Kind regards,

> Des Ward