Check Point Advisories

Filter Proxy HTTP Headers Mismatch

Vulnerability
Protection

Check Point Reference:	SBP-2011-10
Date Published:	2 Aug 2011
Severity:	N/A
Last Updated:	Tuesday 02 August, 2011
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Filter web Proxy is a proxy tool that interferes between a web server and a client browser. It enables users to change the HTTP headers and client side content, e.g. HTML and JavaScript. The filter proxy can also block pop-ups and malicious content. Malicious users can use this technique to change the HTTP headers in a malformed manner that can damage a web server. There are cases in which certain traffic, although not intended for malicious use, is very unsafe, since it may transfer shellcode which is undetectable by IPS.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

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 Filter Proxy HTTP Headers Mismatch 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: Proxy Server Enforcement Violation.
Attack Information: Filter Proxy HTTP headers mismatch