Operating System:

Published:

19 June 2002

Protect yourself against future threats.

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

           ESB-2002.292 -- Microsoft Security Bulletin MS02-031
        Cumulative Patches for Excel and Word for Windows (Q324458)
                               20 June 2002

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                Microsoft Excel 2000
                        Microsoft Office 2000
                        Microsoft Excel 2002
                        Microsoft Word 2002
                        Microsoft Office XP
Operating System:       Windows
Impact:                 Execute Arbitrary Code/Commands

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Title:      Cumulative Patches for Excel and Word for Windows 
            (Q324458)
Date:       19 June 2002
Software:   Microsoft Office for Windows
Impact:     Run Code of Attacker's Choice
Max Risk:   Moderate
Bulletin:   MS02-031

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS02-031.asp.
- - ----------------------------------------------------------------------

Issue:
======
This is a set of cumulative patches that, when applied, applies all
previously released fixes for these products. 

In addition, these patches eliminate four newly discovered
vulnerabilities all of which could enable an attacker to run Macro
code on a user's machine. The attacker's macro code could take
any actions on the system that the user was able to. 

 - An Excel macro execution vulnerability that relates to how inline
   macros that are associated with objects are handled. This
   vulnerability could enable macros to execute and bypass the
   Macro Security Model when the user clicked on an object in
   a workbook.  

 - An Excel macro execution vulnerability that relates to how macros
   are handled in workbooks when those workbooks are opened via a
   hyperlink on a drawing shape. It is possible for macros in a
   workbook so invoked to run automatically. 

 - An HTML script execution vulnerability that can occur when
   an Excel workbook with an XSL Stylesheet that contains HTML
   scripting is opened. The script within the XSL stylesheet
   could be run in the local computer zone. 

 - A new variant of the "Word Mail Merge" vulnerability first
   addressed in MS00-071. This new variant could enable an
   attacker's macro code to run automatically if the user had
   Microsoft Access present on the system and chose to open a
   mail merge document that had been saved in HTML format.

Mitigating Factors:
====================
Excel Inline Macros Vulnerability: 

 - A successful attack exploiting this vulnerability would require
   that the user accept and open a workbook from an attacker and
   then click on an object within the workbook. 

Hyperlinked Excel Workbook Macro Bypass: 

 - A successful attempt to exploit this vulnerability would require
   that the user accept and open an attacker's workbook and click on
   a drawing shape with a hyperlink. 

 - An attacker's destination workbook would have to be accessible to
   the user, either on the local system on an accessible network
   location. 

Excel XSL Stylesheet Script Execution: 

 - A user would have to accept and open an attacker's workbook to
   exploit this vulnerability. 

 - In addition, the user would have to acknowledge a security
   warning by selecting the non-default option. 

Variant of MS00-071, Word Mail Merge Vulnerability: 

 - The Word mail merge document would have to be saved in HTML
   format. As Word is not the default handler for HTML
   applications, the user would have to choose to open the document
   in Word, or acknowledge a security warning. 

 - A successful attack requires that Access be installed locally. 

 - The attacker's data source has to be accessible to the user 
   across a network.

Risk Rating:
============
 - Internet systems: Low
 - Intranet systems: Low
 - Client systems: Moderate

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin at
   http://www.microsoft.com/technet/security/bulletin/ms02-031.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Darryl Higa for reporting the Excel Inline Macros and 
   Hyperlinked Excel Workbook Macro Bypass vulnerabilities. 

 - The dH team and SECURITY.NNOV team (http://www.security.nnov.ru/)
   for reporting the variant of MS00-071.

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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.

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