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Title: Flaw in Visual Basic for Applications Could Allow
Arbitrary Code Execution (822715)
Date: 03 September 2003
Affected Software:
Microsoft Visual Basic for Applications SDK 5.0
Microsoft Visual Basic for Applications SDK 6.0
Microsoft Visual Basic for Applications SDK 6.2
Microsoft Visual Basic for Applications SDK 6.3
Products which include the affected software:
Microsoft Access 97
Microsoft Access 2000
Microsoft Access 2002
Microsoft Excel 97
Microsoft Excel 2000
Microsoft Excel 2002
Microsoft PowerPoint 97
Microsoft PowerPoint 2000
Microsoft PowerPoint 2002
Microsoft Project 2000
Microsoft Project 2002
Microsoft Publisher 2002
Microsoft Visio 2000
Microsoft Visio 2002
Microsoft Word 97
Microsoft Word 98(J)
Microsoft Word 2000
Microsoft Word 2002
Microsoft Works Suite 2001
Microsoft Works Suite 2002
Microsoft Works Suite 2003
Microsoft Business Solutions Great Plains 7.5
Microsoft Business Solutions Dynamics 6.0
Microsoft Business Solutions Dynamics 7.0
Microsoft Business Solutions eEnterprise 6.0
Microsoft Business Solutions eEnterprise 7.0
Microsoft Business Solutions Solomon 4.5
Microsoft Business Solutions Solomon 5.0
Microsoft Business Solutions Solomon 5.5
Impact: Run code of attackers choice
Max Risk: Critical
Bulletin: MS03-037
Microsoft encourages customers to review the Security Bulletins
at:
http://www.microsoft.com/technet/security/bulletin/MS03-037.asp
http://www.microsoft.com/security/security_bulletins/ms03-037.asp
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Issue:
======
Microsoft VBA is a development technology for developing client
desktop packaged applications and integrating them with existing
data and systems. Microsoft VBA is based on the Microsoft Visual
Basic development system. Microsoft Office products include VBA
and make use of VBA to perform certain functions. VBA can also be
used to build customized applications based around an existing
host application.
A flaw exists in the way VBA checks document properties passed to
it when a document is opened by the host application. A buffer
overrun exists which if exploited successfully could allow an
attacker to execute code of their choice in the context of the
logged on user.
In order for an attack to be successful, a user would have to
open a specially crafted document sent to them by an attacker.
This document could be any type of document that supports VBA,
such as a Word document, Excel spreadsheet, PowerPoint
presentation. In the case where Microsoft Word is being used as
the HTML e-mail editor for Microsoft Outlook, this document could
be an e-mail, however the user would need to reply to, or forward
the mail message in order for the vulnerability to be exploited.
Mitigating Factors:
====================
- -The user must open a document sent to them by an attacker in
order for this vulnerability to be exploited.
- -When Microsoft Word is being used as the HTML e-mail editor in
Outlook, a user would need to reply to or forward a malicious e-
mail document sent to them in order for this vulnerability to be
exploited.
- -An attacker's code could only run with the same rights as the
logged on user. The specific privileges the attacker could gain
through this vulnerability would therefore depend on the
privileges granted to the user. Any limitations on a user's
account, such as those applied through Group Policies, would also
limit the actions of any arbitrary code executed by this
vulnerability.
Risk Rating:
============
- Critical
Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read
the Security Bulletins at
http://www.microsoft.com/technet/security/bulletin/ms03-037.asp
http://www.microsoft.com/security/security_bulletins/ms03-037.asp
for information on obtaining this patch.
Acknowledgment:
===============
- eEye Digital Security, http://www.eeye.com
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