Check Point Advisories

Javascript Character Manipulation Obfuscation (Fragus)

Vulnerability
Protection

Check Point Reference:	SBP-2011-08
Date Published:	31 May 2011
Severity:	High
Last Updated:	Thursday 21 March, 2013
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Exploit packs, such as Fragus, are toolkits used by cybercriminals to easily snare victims for their botnets. Solutions enabling security product bypass are often integrated within such tools. Although various security products provide coverage against many web vulnerabilities, such as ActiveX exploits, these known exploits could potentially bypass security products by using JavaScript obfuscation techniques. Several known JavaScript character manipulation techniques obfuscate known exploits so they will bypass security rules - since the exploits are being thoroughly obfuscated, IDS and IPS systems will not recognize them and thus will allow them to pass without any notification.

Protection Overview

This protection will detect and block Fragus based attacks which use the JavaScript character manipulation obfuscation.

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 Character Manipulation Obfuscation (Fragus) 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: Security Products Enforcement Violation.
Attack Information: Javascript character manipulation obfuscation (Fragus)