Remote DoS attack in Internet Information Server 4.0 & 5.0 Vulnerability

   

Microsoft

Internet Information Server 4.0 & 5.0

Binary file

Iisdos.exe

Source of binary file

Iisdos.zip


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.


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.
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