MS00-040: Patch for "Remote Registry Access Authentication" Vulnerability (264684)

SYMPTOMS

Microsoft has released a patch that eliminates a security vulnerability in Microsoft Windows NT 4.0. This vulnerability can allow access to the registry from a remote computer.

The remote computer must be authenticated by a remote registry server before it can be processed. If a request is malformed in a specific fashion, the request is misinterpreted by the remote registry server, causing it not to work. Because the remote registry server runs within the Winlogon.exe system process in Windows NT 4.0, a problem in that process causes problems with the entire system.

Only an authenticated user can run such a request. An anonymous (or null-session) connection cannot cause this problem. You can place an affected computer back in service by rebooting 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:

299444 Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP)

The following file is available for download from the Microsoft Download Center:

x86: Download Q264684i.exe now

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 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 security-enhanced servers that help to 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
   ---------------------------------------------------
   06/07/2000  09:20p  343,312  Rpcrt4.dll    x86
   06/07/2000  09:20p  192,784  Winlogon.exe  x86

   06/07/2000  09:19p  602,384  Rpcrt4.dll    Alpha
   06/07/2000  09:19p  275,216  Winlogon.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:

317636 Windows NT Server 4.0, TerminalServer Edition, Security Rollup Package