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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 http://www.microsoft.com/technet/security/bulletin/fq00-008.mspx.

General Information

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

More Information

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

Obtaining Support on this Issue

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

Revisions

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

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