USSR Advisory #40 - Remote DoS attack in Microsoft IIS 4.0 & 5.0 - Malformed Extension Data in URL Vulnerability. The Ussr Labs Team has recently discovered a memory problem in IIS. Performing an attack with specially-malformed information extension data in the URL will cause the server to slow or stop.
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---------- Forwarded message -------
From: "Ussr Labs" <labs@ussrback.com>
To: "win2k" <win2ksecadvice@listserv.ntsecurity.net>
Cc: "TECHNOTRONIC" <news@technotronic.com>
Subject: Remote DoS attack in Internet Information Server 4.0 & 5.0 "Malformed Extension Data in URL" Vulnerability
Date: Thu, 11 May 2000 17:29:05 -0300
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Remote DoS attack in Internet Information Server 4.0 & 5.0 "Malformed
Extension Data in URL" Vulnerability
USSR Advisory Code: USSR-2000040
Release Date:
May 11, 2000
Affected Software Versions
Microsoft Internet Information Server 4.0
Microsoft Internet Information Server 5.0
THE PROBLEM
The Ussr Labs team has recently discovered a memory problem in IIs
4.0 and 5.0.
What happens is by preforming an attack with specially-malformed
information extension data in The URL,
it will cause slow the performance of an affected server, or
temporarily stop it altogether.
Binary or Source for this D.o.S:
http://www.ussrback.com/
SPECIAL NOTE: That we take no responsibility for this code it is for
educational purposes only.
Vendor Status:
Contacted: Saturday, April 15, 2000 7:12 AM
Vendor Url: http://www.microsoft.com
Program Url:
http://www.microsoft.com/ntserver/web/exec/feature/Datasheet.asp (IIS
4.0)
Program Url:
http://www.microsoft.com/windows2000/guide/server/features/appsvcs.asp
(IIS 5.0)
Fix:
Internet Information Server 4.0:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20906
Internet Information Server 5.0:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20904
More Information:
http://www.microsoft.com/technet/security/bulletin/ms00-030.asp
Microsoft Security Bulletin MS00-021: Frequently Asked Questions,
http://www.microsoft.com/technet/security/bulletin/fq00-030.asp
Microsoft Knowledge Base article Q260205 discusses this issue and
will be available soon
Related Links:
Underground Security Systems Research
http://www.ussrback.com
Greetings:
Eeye, Attrition, w00w00, beavuh, Rhino9, SecurityFocus.com, ADM, HNN,
Sub, Technotronic and Wiretrip.
Copyright (c) 1999-2000 Underground Security Systems Research.
Permission is hereby granted for the redistribution of this alert
electronically. It is not to be edited in any way without express
consent of Ussr. If you wish to reprint the whole or any part of this
alert in any other medium excluding electronic medium, please e-mail
labs@ussrback.com for permission.
Disclaimer:
The information within this paper may change without notice. Use of
this information constitutes acceptance for use in an AS IS
condition. There are NO warranties with regard to this information.
In no event shall the author be liable for any damages whatsoever
arising out of or in connection with the use or spread of this
information. Any use of this information is at the user's own risk.
Feedback:
Please send suggestions, updates, and comments to:
Underground Security Systems Research
mail:labs@ussrback.com
http://www.ussrback.com
u n d e r g r o u n d s e c u r i t y s y s t e m s r e s e a r c
h
http://www.ussrback.com
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