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McAfee Subscription Manager ActiveX control vulnerable to stack buffer overflow

Vulnerability Note VU#481212

Original Release Date: 2006-08-15 | Last Revised: 2006-10-03


The McAfee Subscription Manager ActiveX control contains a buffer overflow, which may allow a remote, unauthenticated attacker to execute arbitrary code.



ActiveX is a technology that allows programmers to create reusable software components that can be incorporated into applications to extend their functionality. Internet Explorer is a common Windows application that makes use of ActiveX controls.

McAfee Security Center

McAfee Security Center is a console for managing McAfee products and several aspects of a computer system's security.

The problem

McAfee Security Center provides a "safe for scripting" ActiveX control that contains a buffer overflow. The ActiveX object is called McSubMgr and is provided by the file mcsubmgr.dll.


By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user. The attacker could also cause Internet Explorer (or the program using the WebOC control) to crash.


Upgrade or patch
Please see McAfee Security Bulletin 407052 for availability of updated versions of the affected software.

Disable ActiveX

Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this vulnerability. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document and the Malicious Web Scripts FAQ.

Note that disabling ActiveX controls in the Internet Zone will reduce the functionality of some web sites.

Vendor Information


McAfee Affected

Updated:  August 15, 2006



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.


Please see McAfee Security Bulletin 407052.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector



This vulnerability was reported by eEye, who in turn credit Karl Lynn

This document was written by Will Dormann.

Other Information

CVE IDs: CVE-2006-3961
Severity Metric: 19.74
Date Public: 2006-08-07
Date First Published: 2006-08-15
Date Last Updated: 2006-10-03 13:52 UTC
Document Revision: 4

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