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RE: WMF Exploit
From: "Derick Anderson" <danderson () vikus com>
Date: Thu, 29 Dec 2005 12:57:06 -0500

 

-----Original Message-----
From: Hayes, Bill [mailto:Bill.Hayes () owh com] 
Sent: Wednesday, December 28, 2005 6:02 PM
To: davidribyrne () yahoo com
Cc: bugtraq () securityfocus com
Subject: RE: WMF Exploit

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...

F-Secure
(http://www.f-secure.com/weblog/archives/archive-122005.html#00000752)
mentioned a Microsoft workaround (which I actually did not see in the MS
TechNet bulliten they linked to):

----

Un-register the Windows Picture and Fax Viewer (Shimgvw.dll)

1. Click Start, click Run, type "regsvr32 -u
%windir%\system32\shimgvw.dll"
(without the quotation marks), and then click OK.

2. A dialog box appears to confirm that the un-registration process has
succeeded.
Click OK to close the dialog box.

Impact of Workaround: The Windows Picture and Fax Viewer will no longer
be started
when users click on a link to an image type that is associated with the
Windows Picture and Fax Viewer.

To undo this change, re-register Shimgvw.dll by following the above
steps.
Replace the text in Step 1 with "regsvr32 %windir%\system32\shimgvw.dll"
(without the quotation marks).

----

It's highly dumbed down but suitable for bulk distribution to the
average user =). Additionally F-Secure mentions sites related to the
attack, blocking them is an interim solution.

Derick Anderson


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