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

Microsoft Security Bulletin (MS00-051)
- --------------------------------------

Patch Available for "Excel REGISTER.ID Function" Vulnerability
Originally posted: July 26, 2000

Summary
=======
Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Microsoft Excel 97 and Excel 2000. The
vulnerability could allow a malicious user to run code from an Excel
worksheet without the user's knowledge.

Frequently asked questions regarding this vulnerability and the patch
can be found at:
http://www.microsoft.com/technet/security/bulletin/fq00-051.asp

Issue
=====
A vulnerability has been discovered in REGISTER.ID, a worksheet
function, when referencing a DLL created by a malicious user. When
REGISTER.ID is invoked from an Excel worksheet it can reference any
DLL on the system and can be harmful if the referenced DLL contains
malicious code. By design, there is no warning given to the user when
REGISTER.ID calls a DLL, from a worksheet.
In order for a malicious user to exploit this vulnerability the
referenced (malicious) DLL would have to reside on the affected
user's computer or on a machine accessible via a UNC path on the
user's network.

Affected Software Versions
==========================
Microsoft Excel 97 or Excel 2000, which ship as part of the Office
suite or as stand-alone products.

Patch Availability
==================
 - Microsoft Excel 2000:

http://officeupdate.microsoft.com/2000/downloaddetails/xl9p3pkg.htm
 - Microsoft Excel 97:
   http://officeupdate.microsoft.com/downloadDetails/xl8p10pkg.htm

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 MS00-051,
   http://www.microsoft.com/technet/security/bulletin/fq00-051.asp
 - Microsoft Knowledge Base (KB) articles, (available soon)
   Q269252 (Excel 2000) and Q269263 (Excel 97) discusses this
   issue in more detail.
 - 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.

Revisions
=========
 - July 26, 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 July 26, 2000
(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.

-----BEGIN PGP SIGNATURE-----
Version: PGP Personal Privacy 6.5.3

iQEVAwUBOYBvwI0ZSRQxA/UrAQFjsAf+NbDDAcneCpPWEkMADYmP3MNHIeK5uo4m
Y4Z0tn1lQBsrxV935JeXDlfFR4qcIlxSlRDDIcnyFCVKwolmgpueLb07pbfbdA6C
gTRThfy4ysZeBrzkTdpif+yULAEPlZhUKoiEhZ0HwIvP2baS16c3stbTz4+LqhOC
nPrALbz5TpkVhsuYADdaHEftK4prgQarDtOHJ5oUOO/t2ezVxhOWHlwCOOM+CTDj
8mL/XI4OggMY3Z8Dfahg6uL1hooZlAJWeSC2QPhWW37xw6R8SrxhQOqoN2tIrLFa
goS+AZ1suG6nTDagC3L+7pulfZ/GM+5hH7ra1KSh1RpSkg2xMgLKFw==
=yfbD
-----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.