It is not only *.wmf extensions it is all files that
have windows metafile headers that will open with the
Windows Picture and Fax Viewer. Any file that has the
header of a windows metafile can trigger this exploit.

--- "Hayes, Bill" <Bill.Hayes (at) owh (dot) com [email concealed]> wrote:

> CERT now has posted Vulnerability Note VU#181038,
> "Microsoft Windows may
> be vulnerable to buffer overflow via specially
> crafted WMF file"
> (http://www.kb.cert.org/vuls/id/181038). The note
> provides additional
> details about the exploit and its effects. Very few
> workarounds have
> been proposed other than blocking at the perimeter
> and possibly
> remapping the .wmf extension to some application
> other than the
> vulnerable Windows Picture and Fax Viewer
> (SHIMGVU.DLL).
>
> Bill...
>
> -----Original Message-----
> From: davidribyrne (at) yahoo (dot) com [email concealed]
> [mailto:davidribyrne (at) yahoo (dot) com [email concealed]]
> Sent: Wednesday, December 28, 2005 4:18 PM
> To: bugtraq (at) securityfocus (dot) com [email concealed]
> Subject: WMF Exploit
>
>
> Another quick observation, again, I apologize if
> this information has
> already been posted; I haven't been able to read all
> the posts today.
> The thumbnail view in Windows Explorer will parse
> the graphics files in
> a folder, even if the file is never explicitly
> opened. This is enough to
> trigger the exploit. Even more frightening is that
> you don't have to use
> the thumbnail view for a thumbnail to be generated.
> Under some
> circumstances, just single-clicking on the file will
> cause it to be
> parsed.
>
> David Byrne
>

__________________________________
Yahoo! for Good - Make a difference this year.
http://brand.yahoo.com/cybergivingweek2005/

[ reply ]