Software Engineering Institute

Microsoft Word versions including Word 2002, 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 specific malformed documents are not properly detected by Microsoft Word, even though they will execute when the document is opened.

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.

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

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/MS01-034.asp

Note that the patches referenced in MS01-028 also correct this vulnerability for Word 2000, Word 97, Word 98J, Word 98 for Macintosh and Word 2001 for Macintosh.