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

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.

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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.

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Solution

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

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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.

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Vendor Information

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Updated: August 15, 2001

Status

Affected

Vendor Statement

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

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](<mailto:[email protected]?Subject=VU%23570330 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.securityfocus.com/bid/1924&gt;
• <http://www.microsoft.com/technet/security/bulletin/ms00-087.asp&gt;
• <http://www.microsoft.com/technet/security/bulletin/fq00-087.asp&gt;

Acknowledgements

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: