Check Point Advisories

Microsoft Internet Explorer 7 HTML Object Memory Corruption (CVE-2007-0947)

Check Point Reference: CPAI-2007-270
Date Published: 4 Jul 2010
Severity: High
Last Updated: Sunday 04 July, 2010
Source:
Industry Reference:CVE-2007-0947
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Microsoft Internet Explorer (IE) is a web browser application that is capable of rendering both static and dynamic web content. The application is primarily used for tasks related to browsing the web, such as displaying HTML encoded pages, downloading files, etc. Extensions to the basic HTML standard allows ability to dynamically change the document structure at the client side, called DHTML. Normally, a client side scripting language is facilitated in order to allow the developers to control the document dynamically, changing it while being displayed. A memory corruption vulnerability exists in the way Microsoft Internet Explorer handles HTML Objects. The vulnerability is due to attempts to access freed objects in certain situations that pertain to HTML objects. Remote attackers can exploit this vulnerability by persuading target users to visit a specially crafted Web page. Successful exploitation would corrupt memory and may allow the attacker to execute arbitrary code on the vulnerable client system, in the context of the logged in user. An attack targeting this vulnerability can result in injection and execution of arbitrary code. If code execution is successful, the behaviour of the target will depend on the intention of the attacker. Any code injected will be executed within the security context of the currently logged in user. In the case of an unsuccessful code execution attack, Internet Explorer may terminate abnormally.

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

  1. In the IPS tab, click Protections and find the Microsoft Internet Explorer 7 HTML Object Memory Corruption protection using the Search tool and Edit the protection's settings.
  2. 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 7 HTML Object Memory Corruption

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