Security Bulletin (MS00-021)

2000-03-3000:00:00

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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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