Microsoft Security Bulletin (MS99-024)

[patrick.mannion () US SOCGEN COM (Patrick, Mannion)]

---------------------- 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.

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                    ********************************

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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