Vulnerability Note VU#345576

Microsoft Word does not check for macros contained in linked template file when opening RTF document

Overview

There is a vulnerability caused by a failure to detect macros embedded in templates used by rich text format documents opened in Microsoft Word. This vulnerability may allow the author of a malicious document to execute arbitrary commands as the user who opens the document.

I. Description

Microsoft Word versions including Word 2000, Word 97, Word 98J, Word 98 for Macintosh and Word 2001 for Macintosh have a vulnerability involving the detection of macros. Macros embedded in templates referenced by rich text format documents are not properly detected by Microsoft Word, even though they will execute when the document is opened. This vulnerability was originally believed not to affect Microsoft Word 2002, but VU#295867 describes a more general form of this vulnerability that affects that version as well.

In Office 2000 and later, there are three possible settings for the macro security. The macro executes even if the user's macro security setting is "High", which would normally prevent execution. If the user's macro security setting is "Medium", the user will fail to receive a warning dialog as expected before the macro executes. The "Low" macro security setting is not recommended, and would normally allow the execution of macros. In earlier versions of Office, the security settings may differ.

II. Impact

The author of a malicious document may be able to execute aribtrary commands as the user who opens the document.

III. Solution

Apply a Patch

Microsoft has published patches correcting this vulnerability. The patches are listed in their advisory at:

http://www.microsoft.com/technet/security/bulletin/MS01-028.asp

This vulnerability is closely related to VU#295867, which is described in Microsoft Security Bulletin MS01-034:

http://www.microsoft.com/technet/security/bulletin/MS01-034.asp

VU#295867 involves the failure to detect macros embedded in Word documents in general. Users that are vulnerable to this problem may wish to review the newer bulletin and apply the patches referenced there.

Systems Affected

Vendor	Status	Date Updated
Microsoft Corporation	Vulnerable	26-Sep-2002

References

http://www.microsoft.com/technet/security/bulletin/MS01-028.asp
http://www.securityfocus.com/bid/2753

Credit

This document was written Cory F. Cohen.

Other Information

Date Public	05/21/2001
Date First Published	09/27/2002 01:51:04 PM
Date Last Updated	09/27/2002
CERT Advisory
CVE Name	CAN-2001-0240
Metric	10.24
Document Revision	15

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