Public Vulnerability Reports

Symantec Norton Internet Security 2006 COM Object Security ByPass Vulnerability



Norton Internet Security 2006 is a comprehensive system security suite that offers protection from spyware, viruses, identity theft, spam, and malicious network traffic. More information can be found on the vendors site at the following URL.


Remote exploitation of a design error vulnerability in an ActiveX control installed by Symantec Norton Internet Security 2006 could allow for the execution of arbitrary code.

Norton Internet Security 2006 installs the following ActiveX control which is registered as safe for scripting:

 Progid: Symantec.Norton.AntiVirus.NAVOptions Clsid: 085ABFE2-D753-445C-8A2A-D4BD46CE0811 File: C:Program FilesNorton Internet SecurityNorton AntiVirusNAVOpts.dll Version: 

This control was designed for use in a application embedded web browser rather than a native Internet Explorer window. When this control is loaded in a standard browser window, it throws an error during initialization which leaves the browser in a defunct state. After the error dialog displays, other Symantec ActiveX Controls can be created without error even if they are not marked as safe for scripting. This can lead to remote code execution if the unsafe controls contain exploitable methods.


Exploitation allows malicious websites to load certain Symantec ActiveX Controls which were not designed or secured for web use.

This condition can lead to the execution of arbitrary code in situations where unsafe controls contain exploitable vulnerabilities.


iDefense confirmed the existence of this vulnerability within version of NavOpts.dll as distributed with Norton Internet Security 2006. Prior versions are suspected to be vulnerable.


Setting the kill-bit for the ActiveX control will prevent this component from loading in Internet Explorer. Although this will prevent potential exploitation, it may also negatively impact the functionality of the application.


Symantec has addressed this vulnerability with a software update. The update is available via their LiveUpdate channels. For more information, consult their advisory at the following URL.


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2006-3456 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


12/13/2006 Initial vendor notification
12/13/2006 Initial vendor response
05/09/2007 Coordinated public disclosure


This vulnerability was reported to iDefense by Peter Vreugdenhil.

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Copyright © 2007 Verisign, Inc.

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