Check Point Advisories

Yahoo Toolbar Internet Explorer 6 Policy Bypass

Check Point Reference: CPAI-2010-396
Date Published: 15 Aug 2010
Severity: Medium
Last Updated: Wednesday 29 January, 2014
Source:
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Yahoo! Toolbar is a toolbar for web browsers and can be installed on the Internet Explorer and Firefox browsers. It allows access to several functions, including Yahoo! Search and Yahoo! Mail. It also contains built-in algorithms to prevent pop-ups and spyware. A policy bypass situation occurs when Yahoo! Toolbar is installed on a Windows host. The vulnerability is due to the installation of Yahoo! Toolbar on a Windows host, which changes the security context of the Internet Explorer 6 in a way that it allows the execution of "Run" method of the "WScript.Shell" from a remote web page. This can be leveraged by remote attackers to execute arbitrary commands on the target host via enticing the target user to open a crafted HTML page.

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 Yahoo Toolbar Internet Explorer 6 Policy Bypass 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:  Yahoo Toolbar Internet Explorer 6 policy bypass

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