Microsoft Word malformed string vulnerability

Overview

A vulnerability in Microsoft Word could allow an attacker to execute arbitrary code on a vulnerable system.

Description

Microsoft Word contains a vulnerability that could be exploited when Word opens a specially crafted document. It is possible that the vulnerability can be exploited by opening a Microsoft Office document that includes an embedded Word document.

More information is available in Microsoft Security Bulletin MS07-014.

Note that reports claim this vulnerability is actively being exploited.

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Impact

By convincing a user to open a specially crafted Word document, an attacker could execute arbitrary code with the privileges of the user running Word. If the user is logged in with administrative privileges, the attacker could take complete control of a vulnerable system.

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Solution

Apply Update for Microsoft
Microsoft has addressed this vulnerability in Microsoft Security Bulletin MS07-014.

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Do not open untrusted Word documents

Do not open unfamiliar or unexpected Word or other Office documents, particularly those hosted on web sites or delivered as email attachments. Please see Cyber Security Tip ST04-010.
**
Do not rely on file name extension filtering**

In most cases, Windows will call Word to open a document even if the document has an unknown file extension. For example, if document.qwer contains the correct file header information, Windows will open document.qwer with Word. Filtering for common extensions (e.g., .doc, and .dot) will not detect all Word documents.

Disable automatic opening of Microsoft Office documents

By default, Microsoft Office 97 and Microsoft Office 2000 will configure Internet Explorer to automatically open Microsoft Office documents. This feature can be disabled by using the Office Document Open Confirmation Tool. Mozilla Firefox users should disable automatic opening of files, as specified in the Securing Your Web Browser document.

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Vendor Information

167928

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Updated: February 15, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to <http://www.microsoft.com/technet/security/advisory/929433.mspx&gt; and <http://www.microsoft.com/technet/security/Bulletin/MS07-014.mspx&gt;.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23167928 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.microsoft.com/technet/security/Bulletin/MS07-014.mspx&gt;
• <http://www.microsoft.com/technet/security/advisory/929433.mspx&gt;
• <http://blogs.technet.com/msrc/archive/2006/12/15/update-on-current-word-vulnerability-reports.aspx&gt;
• <http://blogs.technet.com/msrc/archive/2006/12/06/microsoft-security-advisory-929433-posted.aspx&gt;
• http://www.microsoft.com/downloads/details.aspx?familyid=8B5762D2-077F-4031-9EE6-C9538E9F2A2F&displaylang=en
• <http://secunia.com/advisories/23232/&gt;
• <http://www.microsoft.com/technet/security/bulletin/ms07-014.mspx&gt;
• <http://www.securityfocus.com/bid/21451&gt;

Acknowledgements

This vulnerability was reported by Microsoft.

This document was written by Jeff Gennari.

Other Information

CVE IDs:	CVE-2006-5994
Severity Metric:	37.87 Date Public: