Check Point Advisories

JavaScript String Dissection Evasion

Check Point Reference: CPAI-2015-0274
Date Published: 11 Mar 2015
Severity: Critical
Last Updated: 23 Jan 2017
Protection Provided by:

Security Gateway
R80, R77, R76, 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. These techniques are used by KaiXin Exploit Kit, as well as in other exploit kit landing pages.

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 / R76 / R75

  1. In the IPS tab, click Protections and find the JavaScript String Dissection Evasion protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

This protection's log will contain the following information:

Attack Name:  Web Client Enforcement Violation.
Attack Information:  JavaScript String Dissection Evasion