Microsoft Security Bulletin MS00-008 - Critical

Patch Available for "Registry Permissions" Vulnerability

Published: March 09, 2000 | Updated: April 14, 2000

Version: 1.1

Originally Posted: March 09, 2000
Revised: April 14, 2000

Summary

Microsoft has released a tool that installs tighter permissions on three sets of registry values in Windows NT 4.0. The default permissions could allow a malicious user to gain additional privileges on an affected machine.

Frequently asked questions regarding this vulnerability can be found at https://www.microsoft.com/technet/security/bulletin/fq00-008.mspx.

General Information

Issue

This vulnerability involves three sets of registry keys whose default permissions are too permissive. These permissions could allow a malicious user who could interactively log onto a target machine (or,in one case, access an affected machine from the network) to:

Cause code to run in a local system context.
Cause code to run the next time another user logged onto the same machine.
Disable the security protection for a previously-reported vulnerability.

These three key sets are not related to each other except by the fact that their permissions should be tightened. A tool is available that will reset all of the affected keys to the correct default value.

Affected Software Versions

Microsoft Windows NT 4.0 Workstation
Microsoft Windows NT 4.0 Server
Microsoft Windows NT 4.0 Server, Enterprise Edition
Microsoft Windows NT 4.0 Server, Terminal Server Edition
NOTE: Windows 2000 is not affected by this vulnerability.

Vulnerability Identifier: CAN-1999-1084

Patch Availability

Intel: https://www.microsoft.com/download/details.aspx?FamilyId=AB792154-6BBD-4D27-9C87-8C7689BD908F&displaylang;=en
Alpha: https://www.microsoft.com/download/details.aspx?FamilyId=AECBDFA7-D641-4FE7-A799-9D5C4F103DB2&displaylang;=en
Note: This tool also covers the vulnerability described in MS00-024.

More Information

Please see the following references for more information related to this issue.

Microsoft Security Bulletin MS00-008: Frequently Asked Questions, https://www.microsoft.com/technet/security/bulletin/fq00-008.mspx.
Microsoft Security Bulletin MS99-025, Unauthorized Access to IIS Servers through ODBC Data Access with RDS, https://www.microsoft.com/technet/security/bulletin/ms99-025.mspx.
Microsoft Knowledge Base (KB) article 103861, INFO: Choosing the Debugger That the System Will Spawn, https://support.microsoft.com/default.aspx?scid=kb;en-us;103861.
Microsoft Knowledge Base (KB) article 185590, Guide To Windows NT 4.0 Profiles and Policies (Part 5 of 6), https://support.microsoft.com/default.aspx?scid=kb;en-us;185590.
Microsoft Knowledge Base (KB) article 184375, Security Implications of RDS 1.5, IIS 3.0 or 4.0, and ODBC, https://support.microsoft.com/default.aspx?scid=kb;en-us;184375.
Microsoft TechNet Security web site, https://www.microsoft.com/technet/security/default.mspx.

Obtaining Support on this Issue

This is a fully supported patch. Information on contacting Microsoft Technical Support is available at https://support.microsoft.com/contactussupport/?ws=support.

Revisions

March 09, 2000: Bulletin Created.
April 14, 2000: Bulletin Revised.

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