Vulnerability Note VU#854856
WMI Object Broker ActiveX Control bypasses ActiveX security model
The Microsoft WMI Object Broker ActiveX control bypasses the ActiveX security model, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
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.
If you mark your control as safe for scripting, you are asserting that your control won't do anything to damage a user's system or compromise the user's security, regardless of how your control's methods and properties are manipulated by the Web page's script. In other words, it has to accept any method calls (with any parameters) and/or property manipulations in any order without doing anything bad.
The WMI Object Broker ActiveX control is an object that comes with Microsoft Visual Studio 2005. It may also be present in other software packages. The control is provided by the file wmiscriptutils.dll. This control is marked as "safe for scripting," which means that a web page can control the object, such as by calling its methods.
The WMI Object Broker ActiveX control includes a method that can create an instance of an ActiveX control that exists on the system. The ActiveX objects created in this manner will bypass the ActiveX security model. For example, the "kill bit" and "safe for scripting" options are ignored.
Note that public reports indicate this vulnerability is actively being exploited.
For more information refer to Microsoft Security Advisory (927709).
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.
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.
Systems Affected (Learn More)
|Vendor||Status||Date Notified||Date Updated|
|Microsoft Corporation||Affected||-||13 Feb 2007|
CVSS Metrics (Learn More)
This vulnerability was publicly reported by Michal Bucko and H D Moore.
This document was written by Jeff Gennari and Will Dormann.
- CVE IDs: CVE-2006-4704
- Date Public: 01 Nov 2006
- Date First Published: 01 Nov 2006
- Date Last Updated: 05 Jan 2009
- Severity Metric: 37.46
- Document Revision: 31
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