Microsoft KB Archive/247869

= MS00-003: Local Procedure Call May Permit Unauthorized Account Usage =

Article ID: 247869

Article Last Modified on 9/29/2007

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft BackOffice Server 4.0
 * Microsoft BackOffice Small Business Server 4.5
 * Microsoft Windows NT Server 4.0 Enterprise Edition

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This article was previously published under Q247869



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.



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, click the following article number to view the article in the Microsoft Knowledge Base:

152734 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:

299444 Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP)

The following files are available for download from the Microsoft Download Center:

Download Q247869i.exe for Intel-based computers now

Download Q247869a.exe for Alpha-based computers now

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

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to 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



Windows NT Server 4.0, Terminal Server Edition
Microsoft has confirmed that this problem may cause a 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 may cause a 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/technet/security/bulletin/MS00-003.mspx

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: kbhotfixserver kbqfe kbbug kbfix kbgraphxlinkcritical kbsecbulletin kbsecurity KB247869

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