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IIS 5.0 with patch Q277873 allows executing arbitrary commands on the web server
From: Georgi Guninski <guninski () GUNINSKI COM>
Date: Mon, 27 Nov 2000 18:53:18 +0200

Georgi Guninski security advisory #30, 2000

IIS 5.0 with patch Q277873 allows executing arbitrary commands on the
web server

Systems affected:
IIS 5.0 with patch Q277873 applied (the patch is the problem)

Risk: High
Date: 27 November 2000

Legal Notice:
This Advisory is Copyright (c) 2000 Georgi Guninski. You may distribute
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You may not modify it and distribute it or distribute parts of it
without the author's
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The opinions expressed in this advisory and program are my own and not
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is not liable for any damages caused by direct or  indirect use of the
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Georgi Guninski, bears no responsibility for content or misuse of this
advisory or program or
any derivatives thereof.

I have set up an experimental mailing list about client and web security
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Check: http://www.guninski.com/mailinglist.html


If patch Q277873 is installed on IIS 5.0 then it is possible to execute
arbitrary programs
on the web server.
The following URL:
executes "DIR C:\"
When you are prompted save the output to a file.
It is possble to play with the MSADC directory instead of scripts.
It is also possible to read most files using:


Microsoft issued:
Microsoft Security Bulletin (MS00-086)
Patch Available for "Web Server File Request Parsing" Vulnerability
Originally posted: November 06, 2000
Updated: November 21, 2000
which installs patch Q277873.
Unfortunately patch Q277873 opens another vulnerability which allows
executing arbitrary
programs on the web server.

I suggest deinstalling patch Q277873 until Microsoft patch it properly -
I believe in this case you are exposed to less risk.

Vendor status:
Microsoft was contacted on 25 November 2000.

Check my experimental mailing list at:

Georgi Guninski

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