Check Point Advisories

Internet Explorer COM Object Instantiation Memory Corruption (CVE-2006-4495)

Vulnerability
Protection

Check Point Reference:	CPAI-2006-238
Date Published:	13 Dec 2009
Severity:	High
Last Updated:	Sunday 13 December, 2009
Source:
Industry Reference:	CVE-2006-4495
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Microsoft Internet Explorer allows HTML documents to embed ActiveX controls for the authoring of dynamic web content. ActiveX controls are based on Component Object Model (COM) technology. The invocation of an ActiveX control is performed by Internet Explorer by internally instantiating an object. A vulnerability in the way Microsoft Internet Explorer instantiates certain COM objects that are not designed to be used as ActiveX controls. When instantiation of such COM objects is attempted by Internet Explorer, the application memory can be corrupted as a result. Successful exploitation of this vulnerability can allow for arbitrary code execution within the security context of the currently logged in user. In a simple attack case, the affected Internet Explorer will terminate immediately when the malicious page is opened. In a sophisticated attack scenario, where the malicious user is successful in injecting and executing supplied code, the behaviour of the system is dependent on the nature of the injected code. Any code injected into the vulnerable component would execute in the security context of the currently logged in user.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

In the IPS tab, click Protections and find the Internet Explorer COM Object Instantiation Memory Corruption protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Web Client Enforcement Violation.
Attack Information: Microsoft Internet Explorer COM object instantiation memory corruption