Microsoft Security Bulletin (MS00-021)

[secnotif () MICROSOFT COM (Microsoft Product Security)]

The following is a Security  Bulletin from the Microsoft Product Security
Notification Service.

Please do not  reply to this message,  as it was sent  from an unattended
mailbox.
                    ********************************

-----BEGIN PGP SIGNED MESSAGE-----

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.

- ---------------------------------------------------------
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED
"AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT  DISCLAIMS ALL
WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR  PURPOSE. IN NO EVENT
SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES
WHATSOEVER INCLUDING DIRECT,  INDIRECT, INCIDENTAL, CONSEQUENTIAL,
LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT
CORPORATION OR ITS  SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF
LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING
LIMITATION MAY NOT APPLY.

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

-----BEGIN PGP SIGNATURE-----
Version: PGP 6.0.2

iQEVAwUBOOOrHI0ZSRQxA/UrAQFHGQf/eQwUvuST59r5RNvWT1e1xhwuC+LrxXCQ
70NzExHJLcd2lOOum2B2KBcuSXA2s+zMOhFkU6Ajt/lj/L+T+wlOz11VoSwWe+Eg
isWeWJREJLTu+DHEalRfdTR+YkjoQ4pVUg+btrTneLmUjzgbGNiJD58JA9WP+fE6
L3IwYWFrzt/WUiaA4PrdiFA7HmX4BKA3jqXRboDPmxiAQu64jnvCamMNbpPuHg7v
/bCet5Ic9AE/v5NLnv70GMrf4VsRLiDR9WBDjV/fr9LMOyctosCMhUNS6kOlrLUe
VtJvwNQFhVngwD8CvDrhpbc8pw3fYNjmrboml8vmXW56jJ63CGPtzg==
=No0/
-----END PGP SIGNATURE-----

   *******************************************************************
You have received  this e-mail bulletin as a result  of your registration
to  the   Microsoft  Product  Security  Notification   Service.  You  may
unsubscribe from this e-mail notification  service at any time by sending
an  e-mail  to  MICROSOFT_SECURITY-SIGNOFF-REQUEST () ANNOUNCE MICROSOFT COM
The subject line and message body are not used in processing the request,
and can be anything you like.

To verify the digital signature on this bulletin, please download our PGP
key at http://www.microsoft.com/technet/security/notify.asp.

For  more  information on  the  Microsoft  Security Notification  Service
please  visit  http://www.microsoft.com/technet/security/notify.asp.  For
security-related information  about Microsoft products, please  visit the
Microsoft Security Advisor web site at http://www.microsoft.com/security.