DOCUMENT:Q264684  15-MAY-2002  [winnt]
TITLE   :MS00-040: Patch for "Remote Registry Access Authentication" Vuln
PRODUCT :Microsoft Windows NT
PROD/VER::4.0
OPER/SYS:
KEYWORDS:kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECBulletin

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The information in this article applies to:

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

Microsoft has released a patch that eliminates a security vulnerability in
Microsoft Windows NT 4.0. This vulnerability can allow access to the registry
from a remote computer.

The remote computer must be authenticated by a remote registry server before it
can be processed. If a request is malformed in a specific fashion, the request
is misinterpreted by the remote registry server, causing it not to work. Because
the remote registry server runs within the Winlogon.exe system process in
Windows NT 4.0, a problem in that process causes problems with the entire
system.

Only an authenticated user can run such a request. An anonymous (or null-session)
connection cannot cause this problem. You can place an affected computer back in
service by rebooting the computer.

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:

   x86: DownloadDownload Q264684i.exe now
   (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=23077)

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
   ---------------------------------------------------
   06/07/2000  09:20p  343,312  Rpcrt4.dll    x86
   06/07/2000  09:20p  192,784  Winlogon.exe  x86

   06/07/2000  09:19p  602,384  Rpcrt4.dll    Alpha
   06/07/2000  09:19p  275,216  Winlogon.exe  Alpha



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 Windows NT 4.0 and Windows NT Server version 4.0,
Terminal Server Edition.

MORE INFORMATION
================

For additional information about this issue, visit the following Microsoft Web
site:

   http://www.microsoft.com/technet/security/bulletin/ms00-040.asp

Additional query words: security_patch kbtsesrp

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

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Copyright Microsoft Corporation 2002.