DOCUMENT:Q247869 09-MAY-2002 [winnt] TITLE :MS00-003: Local Procedure Call May Permit Unauthorized Account U PRODUCT :Microsoft Windows NT PROD/VER::4.0,4.5 OPER/SYS: KEYWORDS:kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECBulletin ====================================================================== ------------------------------------------------------------------------------- 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. Copyright Microsoft Corporation 2002.