Check Point Advisories

JavaScript Data Encoding Evasion

Vulnerability
Protection

Check Point Reference:	CPAI-2015-0437
Date Published:	11 Mar 2015
Severity:	Critical
Last Updated:	Wednesday 15 April, 2015
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Web Clients
Vulnerability Description	An attacker might utilize various evasion technique in order to evade detection by IPS devices.

Protection Overview

This protection will detect and block JavaScripts which exhibit irregular patterns, indicating the use of evasion techniques.

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 JavaScript Data Encoding Evasion 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: JavaScript Data Encoding Evasion