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Microsoft Security Bulletin (MS99-024)
From: patrick.mannion () US SOCGEN COM (Patrick, Mannion)
Date: Tue, 6 Jul 1999 16:03:50 -0400


---------------------- Forwarded by Patrick MANNION/us/socgen on 07/06/99 04:03
PM ---------------------------

Microsoft Product Security <secnotif () MICROSOFT COM> on 07/06/99 03:01:55 PM

To:   MICROSOFT_SECURITY () ANNOUNCE MICROSOFT COM
cc:    (bcc: Patrick MANNION/us/socgen)
Subject:  Microsoft Security Bulletin (MS99-024)

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.
                    ********************************

Microsoft Security Bulletin (MS99-024)
--------------------------------------

Patch Available for "Unprotected IOCTLs" Vulnerability

Originally Posted: July 06, 1999

Summary
=======
Microsoft has released a patch that eliminates a vulnerability that could
allow denial of service  attacks against a Microsoft(r) Windows NT(r)
workstation, server or terminal server. An  unprivileged program can disable
the local mouse or keyboard on a server or workstation, and  disable the
console mouse or keyboard on a terminal server.

Frequently asked questions regarding this vulnerability can be found at
http://www.microsoft.com/security/bulletins/MS99-024faq.asp

Issue
=====
The IOCTLs that are used to obtain services from the keyboard and mouse
drivers in Windows NT do  not require that the calling program have
administrative privileges. A user-level program could  use legitimate calls
to disable the mouse and keyboard, after which the machine would need to be
rebooted to restore normal service. On a terminal server, such a program
could disable the  keyboard and mouse on the console.

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

Patch Availability
==================
 - Windows NT Server and Workstation 4.0:
   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/
   fixes/usa/nt40/Hotfixes-PostSP5/IOCTL-fix/
 - Windows NT Server 4.0, Terminal Server Edition:
   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/
   fixes/usa/nt40tse/Hotfixes-PostSP4/IOCTL-fix/

NOTE: Line breaks have added to the above URLs for readability

More Information
================
Please see the following references for more information related to this
issue.
 - Microsoft Security Bulletin MS99-024:
   Frequently Asked Questions,
   http://www.microsoft.com/security/bulletins/MS99-024faq.asp.
 - Microsoft Knowledge Base (KB) article Q236359,
   Denial of Service Attack Using Unprotected IOCTL Function Call,
   http://support.microsoft.com/support/kb/articles/q236/3/59.asp.
   (Note: It may take 24 hours from the original posting of this
   bulletin for the KB article to be visible; however, a copy
   will be immediately available in the patch folder.)
 - Microsoft Security Advisor web site,
   http://www.microsoft.com/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 acknowledges Mark Russinovich of Systems Internals
(http://www.sysinternals.com) for discovering this vulnerability
and reporting it to us.

Revisions
=========
 - July 06, 1999: Bulletin Created.

--------------------------------------------------------------------------

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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
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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.

(c) 1999 Microsoft Corporation. All rights reserved. Terms of Use.

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