This article was previously published under Q277910
This article has been archived. It is offered "as is" and will no longer be updated.
Microsoft has released a patch that eliminates a security vulnerability in Microsoft Windows NT Server 4.0, Terminal Server Edition.
An unchecked buffer in the Terminal Server logon prompt could allow a malicious user to cause the Terminal Server-based server to run arbitrary code. The ability to run arbitrary code could allow the malicious user to add, change, or delete data, run code already on the server, or upload new code to the server and run it. The malicious user would not need to successfully log on to the Terminal Server-based server to initiate this attack.
This vulnerability could be exploited remotely if connection requests are not filtered. By default, Terminal Server listens on TCP port 3389. You should block this port at the firewall or router if Terminal Server access from the Internet is not required.
To resolve this problem, either obtain the hotfix referenced in this section or 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, Terminal Server Edition, Security Rollup Package
The following file is available for download from the Microsoft Download Center:
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 ------------------------------------------------ 10/03/2000 06:21p 42,768 Regapi.dll Intel
Microsoft has confirmed that this problem may cause a degree of security vulnerability in Windows NT Server 4.0, Terminal Server Edition.
For related information about this problem, please visit the following Microsoft Web site: