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MS Windows NT Terminal Server 4.0 buffer overflow in regapi.dll allows remote code execution or DoS

Vulnerability Note VU#570330

Original Release Date: 2001-08-15 | Last Revised: 2001-08-15

Overview

Microsoft Windows NT 4.0 Terminal Server contains a buffer overflow that could allow an intruder to execute arbitrary code with the privileges of an administrator.

Description

There is a buffer overflow in the code that processes the username (specifically in RegAPI.DLL) in Microsoft Windows NT 4.0 Terminal Server. This allows an intruder to submit a specially crafted username in such a way as to cause Terminal Server to execute code of the intruder's choosing. The intruder does not need to have a valid username or password; anyone with access to port 3389/TCP can exploit this vulnerability.

Impact

Intruders can execute arbitrary code with the privileges of a logged in administrator. Additionally, an intruder who can log in locally can cause Terminal Server to crash.

Solution

Apply a patch as described in http://www.microsoft.com/ntserver/terminalserver/downloads/critical/q277910/default.asp.

You may also with to block access to port 3389/TCP to reduce your exposure to this vulnerability. This does not eliminate the vulnerability, but it does reduce the number of people who can exploit it.

Vendor Information

570330
Expand all

Microsoft

Updated:  August 15, 2001

Status

  Vulnerable

Vendor Statement

See http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/ms00-087.asp.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Credit

This vulnerability was discovered by Bruno Acselrad of CORE SDI S.A., Buenos Aires, Argentina.

This document was written by Shawn V. Hernan.

Other Information

CVE IDs: CVE-2000-1149
Severity Metric: 16.88
Date Public: 2000-11-08
Date First Published: 2001-08-15
Date Last Updated: 2001-08-15 04:29 UTC
Document Revision: 5

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