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Microsoft Security Bulletin (MS00-085)
- --------------------------------------
Patch Available for "ActiveX Parameter Validation" Vulnerability
Originally posted: November 2, 2000

Summary
=======
Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Windows 2000. The vulnerability could
allow enable a malicious user to potentially run code on another
user's machine.

Frequently asked questions regarding this vulnerability and the patch
can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-085.asp

Issue
=====
An ActiveX control that ships as part of Windows 2000 contains an
unchecked buffer. If the control was called from a web page or HTML
mail using a specially-malformed parameter, it would be possible to
cause code to execute on the machine via a buffer overrun. This could
potentially enable a malicious user to take any desire action on the
user's machine, limited only by the permissions of the user.

The vulnerability could only be exploited if ActiveX controls are
enabled in IE, Outlook or Outlook Express. The Security Zones feature
in IE enables customers to limit what web sites can do, and customers
who have used the feature to prevent untrusted sites from invoking
ActiveX controls would be at minimal risk from the web-based attack
scenario. Customers who have applied the Outlook Security Update
would be protected against the mail-borne scenario, since it moves
mail into the Restricted Sites Zone, thereby preventing HTML mails
from invoking ActiveX controls.

Affected Software Versions
==========================
 - Microsoft Windows 2000 Server
 - Microsoft Windows 2000 Professional
 - Microsoft Windows 2000 Advanced Server
 - Microsoft Windows 2000 Datacenter Server

Patch Availability
==================
 - http://www.microsoft.com/Downloads/Release.asp?ReleaseID=25532

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.
 - Frequently Asked Questions: Microsoft Security Bulletin MS00-085,
   http://www.microsoft.com/technet/security/bulletin/fq00-085.asp
 - Microsoft Knowledge Base article Q278511 discusses this issue and
   will be available soon.
 - 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
Product Support Services is available at
http://support.microsoft.com/support/contact/default.asp.

Acknowledgments
===============
Microsoft thanks USSR Labs (www.ussrback.com) for reporting
this issue to us and working with us to protect customers.

Revisions
=========
 - November 2, 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 November 2, 2000

(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.

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