Vulnerability Note VU#996892

Microsoft Word malformed pointer vulnerability

Original Release date: 14 Dec 2006 | Last revised: 13 Feb 2007

Overview

A vulnerability in Microsoft Word could allow an attacker to compromise a vulnerable system.

Description

Data used by Microsoft Word to construct a destination address for a memory copy routine is embedded within a Word document itself. If an attacker constructs a Word document with a specially crafted value used to build this destination address, then that attacker may be able to overwrite arbitrary memory.

An attacker could trigger this vulnerability by convincing a user to open a specially crafted Word document.

Exploit code for this vulnerability is publicly available.

Impact

The specific consequences of this vulnerability are unclear, but may include execution of arbitrary code and denial of service.

Solution

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

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.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Microsoft CorporationAffected-13 Feb 2007
OpenOffice.orgAffected-02 Jan 2007
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A

References

Credit

This vulnerability was publicly disclosed by disco.

This document was written by Jeff Gennari.

Other Information

  • CVE IDs: CVE-2006-6561
  • Date Public: 12 Dec 2006
  • Date First Published: 14 Dec 2006
  • Date Last Updated: 13 Feb 2007
  • Severity Metric: 11.00
  • Document Revision: 18

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