Q259496: MS00-008: Incorrect Registry Setting May Allow Cryptography Key
Article: Q259496
Product(s): Microsoft Windows NT
Version(s): 4.0
Operating System(s):
Keyword(s): kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical KbSECVulnerability KbSECBulletin Kb
Last Modified: 08-MAY-2002
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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
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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
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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 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
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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
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