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Related information

  Microsoft Word Mail Merge vulnerability

  dH team & SECURITY.NNOV: A variant of "Word Mail Merge" vulnerability

  Security Bulletin (MS00-071)

  MS Word and MS Access vulnerability - executing arbitrary programs, may be exploited by IE/Outlook

From:MICROSOFT <secure_(at)_microsoft.com>
Date:20.06.2002
Subject:Security Bulletin MS02-031: Cumulative Patches for Excel and Word for Windows (Q324458)

- ----------------------------------------------------------------------
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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