[10962] in bugtraq
Microsoft Security Bulletin (MS99-024)
daemon@ATHENA.MIT.EDU (Patrick, Mannion)
Wed Jul 7 00:46:47 1999
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Date: Tue, 6 Jul 1999 16:03:50 -0400
Reply-To: patrick.mannion@US.SOCGEN.COM
From: "Patrick, Mannion" <patrick.mannion@US.SOCGEN.COM>
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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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