Public Vulnerability Reports

Microsoft Office Visio Viewer ActiveX Type Confusion Vulnerability

12.03.13

BACKGROUND

Microsoft Visio Viewer is an ActiveX control used to render Visio drawings and diagrams inside Internet Explorer and Outlook. Visio Viewer is included in Microsoft Office as a component of Outlook. More information can be found at the following vendor's website:

https://office.microsoft.com/en-us/visio/

DESCRIPTION

Remote exploitation of a type confusion vulnerability in Microsoft Corp.'s Visio Viewer could allow an attacker to execute arbitrary code with the privileges of the current user.

The vulnerability occurs when parsing a malformed Visio file. A Visio file contains different types of Visio objects in a tree structure. When certain Visio objects are crafted to be the parent of other specific objects, type confusion will happen and the vulnerable code will mistakenly take a memory structure as an object and call a function pointer from its vftable. This can lead to execution of arbitrary code.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the user viewing the Web page. To exploit this vulnerability, a targeted user must load a malicious Web page created by an attacker. An attacker typically accomplishes this via social engineering or injecting content into compromised, trusted sites. After the user visits the malicious Web page, no further user interaction is needed.

DETECTION

Visio Viewer 2010 SP1 is vulnerable.

WORKAROUND

Since this vulnerability is present in an ActiveX control, the killbit can be set to prevent the control from loading in Internet Explorer. The CLSID for the control is "F8CF7A98-2C45-4c8d-9151-2D716989DDAB." Setting the killbit for this CLSID will prevent exploitation.

VENDOR RESPONSE

Microsoft has released a fix which addresses this issue. For more information, consult their advisory at the following URL:

http://technet.microsoft.com/en-us/security/bulletin/ms13-022

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2013-0079 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

09/12/2012 Initial Vendor Notification
09/12/2012 Initial Vendor Reply
03/12/2013 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by Aniway.Anyway@gmail.com.

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LEGAL NOTICES

Copyright © 2013 Verisign, Inc.

Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense Verisign. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customer service for permission.

Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.