Microsoft has released a tool that corrects the permissions on several registry values in Microsoft Windows NT 4.0. The default permissions could allow a malicious user to gain additional privileges on an affected machine.
The "RAS Administration" key, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RAS, provides a way to install third-party RAS products that work with the Windows NT native RAS service. By changing one of the values in this key, it would be possible for a malicious user to specify code of her choice as a third-party management tool. The code would then run in the LocalSystem security context. Although it might be possible to make the needed registry changes remotely, the malicious user's code would need to reside on the affected computer itself. RAS is not installed on Windows NT 4.0 machines by default.
For additional information about other registry keys affected by this tool, click the article numbers below
to view the articles in the Microsoft Knowledge Base:
Windows NT 4.0 SNMP Registry Entries Are Readable
MTS Package Administration Key Includes Information About Users
For additional information about this vulnerability, see the following Microsoft Web site:
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:
Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP)
The following file is available for download from the Microsoft Download Center:
Download Q265714i.exe now
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For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
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.
: Due to file dependencies, this patch requires Windows NT 4.0 Service Pack 5 or later.
The English version of this fix should have the following file attributes or later:
Date Time Size File name Platform
06/23/2000 08:28p 42,256 Regacl40.exe Intel
06/23/2000 08:28p 161,040 Tcpcfg.dll Intel
06/23/2000 08:27p 96,016 Regacl40.exe Alpha
06/23/2000 08:26p 242,960 Tcpcfg.dll Alpha
Microsoft has confirmed that this problem may cause a degree of security vulnerability in Windows NT 4.0.