DOCUMENT:Q259496 08-MAY-2002 [winnt] TITLE :MS00-008: Incorrect Registry Setting May Allow Cryptography Key PRODUCT :Microsoft Windows NT PROD/VER::4.0 OPER/SYS: KEYWORDS:kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECBulletin Kb ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 4.0 - Microsoft Windows NT Server version 4.0 - Microsoft Windows NT Server, Enterprise Edition version 4.0 - Microsoft Windows NT Server version 4.0, Terminal Server Edition - Microsoft BackOffice Server 4.0 - Microsoft BackOffice Small Business Server version 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== On a shared computer, it may be possible for a malicious user to interactively log on to the computer and compromise the security of the cryptographic keys of other users who subsequently log on to the same computer. CAUSE ===== This vulnerability involves a registry key that is used to specify the dynamic-link library (DLL) for a hardware accelerator in the default Cryptographic service providers (CSPs) that are included with Cryptography Application Programming Interface (CryptoAPI). By design, such a DLL has access to users' public and private keys. Although only administrators should have permission to add such a DLL, the permissions on the key could allow any user who can interactively log on to the computer to do so. By writing a DLL and installing it, a malicious user could compromise the keys of other users who subsequently use 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 files are available for download from the Microsoft Download Center: x86: DownloadDownload Q259496i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20330) Alpha: DownloadDownload Q259496a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20331) For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base: Q119591 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 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 ------------------------------------------------ 04/11/00 08:19p 41,744 Regacl40.exe Intel 04/12/00 03:43p 95,504 Regacl40.exe Alpha Microsoft Windows NT Server version 4.0, Terminal Server Edition ---------------------------------------------------------------- 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 may cause a degree of security vulnerability in Windows NT 4.0. MORE INFORMATION ================ The computers primarily at risk are workstations and servers running Terminal Server Edition. If you follow typical security recommendations, typical users are not allowed to interactively log on to domain controllers, Web servers, database servers, ERP servers, and other security-critical computers. A tool is available that resets the permissions on the key to the correct default values. In addition, it incorporates the functionality of the tool provided in Microsoft Security Bulletin MS00-008 located at the following Microsoft Web site: http://www.microsoft.com/technet/security/bulletin/ms00-008.asp This issue affects only computers running Windows NT 4.0; it does not affect computers running Microsoft Windows 2000. For related information about this problem, please visit the following Microsoft Web sites: http://www.microsoft.com/technet/security/bulletin/ms00-024.asp http://www.microsoft.com/technet/security/bulletin/fq00-024.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 ====================================================================== Keywords : kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECBulletin KbSECHack Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch kbAudDeveloper kbBackOfficeSearch kbSBServSearch kbBackOfficeServ400 kbSBServ400 Version : :4.0 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.