Alert: Microsoft Security Bulletin - MS02-031

From: Russ (Russ.Cooper@RC.ON.CA)
Date: 06/19/02


Date:         Wed, 19 Jun 2002 17:40:44 -0400
From: Russ <Russ.Cooper@RC.ON.CA>
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM

http://www.microsoft.com/technet/security/bulletin/MS02-031.asp

Cumulative Patches for Excel and Word for Windows (Q324458)

Originally posted: June 19, 2002

Summary

Who should read this bulletin: Customers using Microsoft® Excel for Windows® or Microsoft Word for Windows.

Impact of vulnerability: Run code of attacker's choice.

Maximum Severity Rating: Moderate

Recommendation: Customers should apply the patches.

Affected Software:
- Microsoft Excel 2000 for Windows
- Microsoft Office 2000 for Windows
- Microsoft Excel 2002 for Windows
- Microsoft Word 2002 for Windows
- Microsoft Office XP for Windows

Technical description:

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.

Vulnerability identifiers:

- Excel Inline Macros Vulnerability:CAN-2002-0616
- Hyperlinked Excel Workbook Macro Bypass: CAN-2002-0617
- Excel XSL Stylesheet Script Execution: : CAN-2002-0618
- Variant of MS00-071, Word Mail Merge Vulnerability: CAN-2002-0619

This email is sent to NTBugtraq automatically as a service to my subscribers. Since its programmatically created, and since its been a long time since anyone paid actual money for my programming skills, it may or may not look that good...;-]

I can only hope that the information it does contain can be read well enough to serve its purpose.

Cheers,
Russ - Surgeon General of TruSecure Corporation/NTBugtraq Editor



Relevant Pages

  • Microsoft Security Bulletin MS02-031
    ... Cumulative Patches for Excel and Word for Windows ... all of which could enable an attacker to run Macro code on a user's machine. ... - An Excel macro execution vulnerability that relates to how inline ... workbook so invoked to run automatically. ...
    (microsoft.public.security)
  • [NT] Cumulative Patches for Excel and Word for Windows
    ... The attacker's macro code could take any actions on the system ... * An Excel macro execution vulnerability that relates to how inline ... * An Excel macro execution vulnerability that relates to how macros are ... It is possible for macros in a workbook so invoked to run ...
    (Securiteam)
  • Re: Using personal.xls in two windows
    ... If that doesn't work for you, then you could mark the personal.xls file as ReadOnly (using windows Explorer). ... You'll have to remove that readonly mark, make your changes in excel, save the workbook, and then mark it as ReadOnly. ... If I open excel book 1, then c/o New, it opens book 2 but on taskbar only. ...
    (microsoft.public.excel.misc)
  • Re: Microsoft Security Bulletin MS02-031 & Office 97
    ... Does this vulnerability affect the Office 97 product line? ... Cumulative Patches for Excel and Word for Windows ... > The attacker's macro code could take any actions on the system that the ... > workbook so invoked to run automatically. ...
    (microsoft.public.security)
  • Re: Excel Macro-enabled Workbook
    ... Windows XP SP3 or later. ... 2003 to open, edit, save, and print files in the 2007 file format. ... Excel 2007 can open all recent file formats right out of the box, ... enabled Workbook as I am using some macros. ...
    (microsoft.public.excel.misc)