Patch Available for "Remote Registry Access Authentication" Vulnerability
Originally posted: June 08, 2000
Microsoft has released a patch that eliminates a security vulnerability in
Microsoft(r) Windows NT 4.0. Under certain conditions, the vulnerability
could be used to cause a Windows NT 4.0 machine to fail.
Frequently asked questions regarding this vulnerability and
the patch can be found at
Before a request to access the registry from a remote machine can be
processed, it must first be authenticated by the Remote Registry server. If
the request is malformed in a specific fashion, it could be misinterpreted
by the remote registry server, causing it to fail. Because the Remote
Registry server is contained within the winlogon.exe system process on
Windows NT 4.0, a failure in that process would cause the entire system to
Only an authenticated user could levy such a request -- an anonymous (or
null-session) connection could not cause this failure. An affected machine
could be put back into service by rebooting.
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.
- Microsoft Windows NT 4.0 Workstation, Server, and
Server, Enterprise Edition:
- Microsoft Windows NT 4.0 Server, Terminal Server Edition:
To be released shortly
Note: Additional security patches are available at the Microsoft Download
Please see the following references for more information related to this
- Frequently Asked Questions: Microsoft Security Bulletin MS00-040,
- Microsoft Knowledge Base article Q264684 discusses this issue
and will be available soon.
- Microsoft TechNet Security web site,
Obtaining Support on this Issue
This is a fully supported patch. Information on contacting
Microsoft Technical Support is available at
Microsoft thanks Renaud Deraison from the Nessus Team
(http://www.nessus.org/) for reporting this issue to us and working with us
to protect customers.
- June 08, 2000: Bulletin Created.
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Last Updated June 08, 2000