Remote DoS attack in Internet Information Server 4.0 & 5.0 "Malformed Extension Data in URL" Vulnerability

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
[email protected] 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:[email protected]
http://www.ussrback.com

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h
http://www.ussrback.com