Check Point Advisories

Base64 Decode Method inside HTTP Header

Vulnerability
Protection

Check Point Reference:	CPAI-2015-1418
Date Published:	21 Dec 2015
Severity:	High
Last Updated:	Monday 29 May, 2017
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Attackers may use Base64 encoded content inside HTTP headers, and decode it dynamically in order to avoid being detected by IPS products.

Protection Overview

This protection will detect Base64-decoding of HTTP header content.

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 Base64 Decode Method inside HTTP Header 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: Application Servers Protection Violation.
Attack Information: Base64 Decode Method inside HTTP Header