Check Point Advisories

Internet Explorer CSS Recursive Import Memory Corruption (CVE-2010-3971)

Check Point Reference: CPAI-2010-349
Date Published: 23 Dec 2010
Severity: Critical
Last Updated: Thursday 23 December, 2010
Source:
Industry Reference:CVE-2010-3971
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description Microsoft Internet Explorer is the most widely used Internet browser. A memory corruption vulnerability has been reported in the way Microsoft Internet Explorer parses HTML pages that contain recursive CSS import. The vulnerability is due to the creation of uninitialized memory during a CSS function within Internet Explorer. To trigger this issue, an attacker may create a malicious Web page that will cause Internet Explorer to exit unexpectedly. Successful exploitation of this vulnerability will crash the browser, and may allow execution of arbitrary code on the vulnerable system.

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 / R71 / R70 / R65

  1. In the IPS tab, click Protections and find the Internet Explorer CSS Recursive Import 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:  Internet Explorer CSS recursive import memory corruption

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