Check Point Advisories

Legacy Browser Exploit Whitespace Obfuscation

Vulnerability
Protection

Check Point Reference:	SBP-2011-04
Date Published:	22 Mar 2011
Severity:	High
Last Updated:	Monday 15 September, 2014
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70
Who is Vulnerable?
Vulnerability Description	Although various security products provide coverage against many web vulnerabilities known exploits could potentially bypass security products by using JavaScript obfuscation techniques. An example of such a technique is the whitespace obfuscation. Such 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 whitespace obfuscation as used by old Metasploit exploits.

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

In the IPS tab, click Protections and find the Legacy Browser Exploit Whitespace Obfuscation 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: Legacy Browser Exploit Whitespace Obfuscation