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Re: Blocking WMF Files via Squid
From: bugtraq () jammeh co uk
Date: Tue, 03 Jan 2006 19:28:33 +0000

Gaddis, Jeremy L. wrote:
In response to the new 0-day WMF exploit, the educational institution for which I work recently took two steps to mitigate a possible infection.

The first step was filtering files with the ".wmf" extension at the e-mail gateway via McAfee's Groupshield. The other step was to block URLs ending in ".wmf" through Squid, the caching proxy server (through which all of our HTTP traffic is transparently proxied).

I have detailed the few steps that were needed to do this at http://www.jeremygaddis.com/2005/12/29/blocking-wmf-at-the-perimeter/
in the event that it might be useful for others looking to do the same.

Please feel free to comment or provide feedback that may be of benefit.

Thanks,
-j
Sorry if the below has already been posted to list...

This is useful, but it's also interesting to see that on the whole a .wmf renamed with extension .jpg will slip though simple file*name* blocking. Filetype checking is required. Something which might be good for people to flag early.

Ref: http://vil.nai.com/vil/content/v_137760.htm

Cheers
James

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