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Microsoft Security Bulletin (MS00-021)
- --------------------------------------

Patch Available for "Malformed TCP/IP Print Request" Vulnerability

Originally Posted: March 30, 2000

Summary
=======
Microsoft has released a patch that eliminates a security
vulnerability in the TCP/IP Printing Services for Microsoft(r)
Windows NT(r) 4.0 and Windows(r) 2000. If this service is installed,
the vulnerability could allow a malicious user to  disrupt printing
services.

Frequently asked questions regarding this vulnerability can be found
at
http://www.microsoft.com/technet/security/bulletin/fq00-021.asp.

Issue
=====
TCP/IP Printing Services is an RFC 1179-compliant printing service
designed for environments that use the Berkeley Remote  Printing
protocols, also known as LPD and LPR. (In Windows 2000, TCP/IP
Printing Services are also known as Print Services  for Unix). A
specially-malformed print request could cause TCPSVC.EXE to crash,
which would not only prevent the server from  providing printing
services, but also would stop several other services, most importantly
DHCP. Any affected services could  be put back into service by
restarting them; it would not be necessary to reboot the machine.

It is important to note that TCP/IP Printing Services is different
from the native Windows NT 4.0 and Windows 2000 printing  services.
TCP/IP Printing Services is not installed by default, and the
vulnerability at hand here would not allow a  malicious user to
disrupt printing via the native Windows NT 4.0 and Windows 2000
printing services.

Affected Software Versions
==========================
 - Microsoft Windows NT 4.0 Workstation
 - Microsoft Windows NT 4.0 Server
 - Microsoft Windows NT 4.0 Server, Enterprise Edition
 - Microsoft Windows NT 4.0 Server, Terminal Server Edition
 - Microsoft Windows 2000 Professional
 - Microsoft Windows 2000 Server
 - Microsoft Windows 2000 Advanced Server

Patch Availability
==================
 - Windows 2000 Professional, Server, and Advanced Server:
   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19884
 - Windows NT 4.0 Workstation, Windows NT 4.0 Server, and
   Windows NT 4.0 Server, Enterprise Edition:
   Intel:
   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20015
   Alpha:
   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20016
 - Windows NT 4.0 Server, Terminal Server Edition:
   To be released shortly

Note Additional security patches are available at the Microsoft
Download Center

More Information
================
Please see the following references for more information related to
this issue.
 - Microsoft Security Bulletin MS00-021: Frequently Asked Questions ,
   http://www.microsoft.com/technet/security/bulletin/fq00-021.asp.
 - Microsoft Knowledge Base (KB) article Q257870
   (Will be available within 24 hours)
 - RFC 1179, Line Printer Daemon Protocol,
   http://www.ietf.org/rfc/rfc1179.txt.
 - Microsoft TechNet Security web site,
   http://www.microsoft.com/technet/security/default.asp.

Obtaining Support on this Issue
===============================
This is a fully supported patch. Information on contacting Microsoft
Technical Support is available at
http://support.microsoft.com/support/contact/default.asp

Acknowledgments
===============
Microsoft thanks Underground Security Systems Research
(http://www.ussrback.com) for reporting this issue to us and working
with us to protect customers.

Revision
========
 -  March 30, 2000: Bulletin Created.

- ---------------------------------------------------------
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Last updated March 30, 2000
(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.

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