KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q247869: MS00-003: Local Procedure Call May Permit Unauthorized Account U

Article: Q247869
Product(s): Microsoft Windows NT
Version(s): 4.0,4.5
Operating System(s): 
Keyword(s): kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECBulletin
Last Modified: 09-MAY-2002

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Windows NT Server version 4.0, Terminal Server Edition 
- Microsoft Windows NT Workstation version 4.0 
- Microsoft Windows NT Server version 4.0 
- Microsoft BackOffice Server 4.0 
- Microsoft BackOffice Small Business Server version 4.5 
- Microsoft Windows NT Server, Enterprise Edition version 4.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

On a computer that is running Windows NT 4.0, it is possible for a malicious
user to use a program that makes a specific local procedure call (LPC) to
impersonate any other user who has local logon privileges and run any program,
including programs that can run in the LocalSystem context. If the domain
administrator's credentials are present on the computer, this could result in
compromised security for the domain.

RESOLUTION
==========

Windows NT Server 4.0, Terminal Server Edition
----------------------------------------------

To resolve this problem, obtain the latest service pack for Windows NT Server
4.0, Terminal Server Edition. For additional information, please see the
following article in the Microsoft Knowledge Base:

  Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

Windows NT Server or Workstation 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 files are available for download from the Microsoft Download
Center:

  DownloadDownload Q247869i.exe for Intel-based computers now
  (http://www.microsoft.com/downloads/release.asp?ReleaseID=17382)

  DownloadDownload Q247869a.exe for Alpha-based computers now
  (http://www.microsoft.com/downloads/release.asp?ReleaseID=17383)

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-language version of this fix should have the following file
attributes or later:

  Date       Time     Size        File name      Platform
  -------------------------------------------------------
  01/17/00   01:53p     952,960   Ntkrnlmp.exe   Intel
  01/17/00   01:52p     932,672   Ntoskrnl.exe   Intel
  12/02/99   01:32p   1,400,256   Ntkrnlmp.exe   Alpha
  12/02/99   01:32p   1,372,032   Ntoskrnl.exe   Alpha
  03/16/00   11:48a         682   Ms003.txt
  02/21/00   10:31a       4,562   Readme.txt



STATUS
======

Windows NT Server 4.0, Terminal Server Edition
----------------------------------------------

Microsoft has confirmed that this problem could result in some degree of security
vulnerability in Windows NT Server 4.0, Terminal Server Edition. This problem
was first corrected in Windows NT Server 4.0, Terminal Server Edition Service
Pack 6.

Windows NT Server or Workstation 4.0
------------------------------------

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

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

For additional information about local procedure calls, see pages 95 and 119 of
the Microsoft Windows NT Workstation 4.0 Resource Kit.

For related information about this problem, please visit the following Microsoft
Web site:

  http://www.microsoft.com/security/bulletins/ms00-003.asp

For additional security-related information about Microsoft products, please
visit the following Microsoft Web site:

  http://www.microsoft.com/security/


Additional query words: security_patch NtImpersonateClientOfPort LocalSystem

======================================================================
Keywords          : kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECBulletin 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch kbAudDeveloper kbBackOfficeSearch kbSBServSearch kbBackOfficeServ400 kbSBServ450
Version           : :4.0,4.5
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.