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Q271652: Patch for Malformed URL Vulnerability That Disables Web Server

Article: Q271652
Product(s): Microsoft Windows NT
Version(s): 4.0
Operating System(s): 
Keyword(s): kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECBulletin
Last Modified: 15-MAY-2002

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The information in this article applies to:

- Microsoft Windows NT Server version 4.0 
- Microsoft Windows NT Server, Enterprise Edition version 4.0 
- Microsoft Windows NT Workstation version 4.0 
- Microsoft Windows NT Server version 4.0, Terminal Server Edition 
- Microsoft Internet Information Server version 4.0 
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SYMPTOMS
========

Microsoft has released a patch that eliminates a security vulnerability in
Internet Information Server (IIS). This vulnerability could enable a malicious
user to send malformed URLs that prevent a Web server from being able to respond
to requests for Web pages, FTP services, or any other services that are provided
by IIS.

NOTE: This vulnerability does not provide the opportunity to compromise any data
on the server or compromise any administrative privileges on the server. You can
place the server back in service by restarting the IIS service.

You can find additional information about this vulnerability and the patch at the
following Microsoft Web site:

  http://www.microsoft.com/technet/security/bulletin/ms00-063.asp

Frequently asked questions about this vulnerability and the patch are available
at the following Microsoft Web site:

  http://www.microsoft.com/technet/security/bulletin/fq00-063.asp

CAUSE
=====

The vulnerability is caused by a problem in Windows NT 4.0 that causes IIS to
mishandle a particular type of invalid URL under certain conditions.

RESOLUTION
==========

Windows NT 4.0
--------------

To resolve this problem, obtain the individual package referenced below or obtain
the Windows NT 4.0 Security Rollup Package. For additional information on the
SRP, click the article number below to view the article in the Microsoft
Knowledge Base:

  Q299444 Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP)

The following file is available for download from the Microsoft Download Center:

  DownloadDownload Q271652i.exe now
  (http://www.microsoft.com/downloads/release.asp?ReleaseID=24403)

For additional information about how to download Microsoft Support files, click
the article number below to view the article in the Microsoft Knowledge Base:

  Q119591 How to Obtain Microsoft Support Files from Online Services

Microsoft used the most current virus detection software available on the date of
posting to scan this file for viruses. After it is posted, the file is housed on
secure servers that prevent any unauthorized changes to the file.

The English version of this fix should have the following file attributes or
later:

  Date        Time    Size     File name     Platform
  ---------------------------------------------------------------
  08/17/2000  07:43p  375,056  Kernel32.dll  x86
  08/30/2000  07:07p  375,056  Kernel32.dll  x86 (Uniprocessor)

  08/17/2000  08:42p  590,096  Kernel32.dll  Alpha
  08/17/2000  08:42p  590,096  Kernel32.dll  Alpha (Uniprocessor)



Microsoft Windows NT Server version 4.0, Terminal Server Edition
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To resolve this problem, obtain the Windows NT Server 4.0, Terminal Server
Edition, Security Rollup Package (SRP). For additional information about the
SRP, click the article number below to view the article in the Microsoft
Knowledge Base:

  Q317636 Windows NT Server 4.0, Terminal Server Edition, Security Rollup
  Package

STATUS
======

Microsoft has confirmed that this problem could result in some degree of
security vulnerability in Microsoft Windows NT 4.0.

Additional query words: security_patch

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Keywords          : kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECBulletin 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch kbiisSearch kbiis400
Version           : :4.0
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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