Check Point Advisories

Web Servers HTTP POST Overly Large Content-Length Denial of Service

Vulnerability
Protection

Check Point Reference:	CPAI-2013-2447
Date Published:	4 Jul 2013
Severity:	High
Last Updated:	Sunday 08 December, 2013
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70
Who is Vulnerable?
Vulnerability Description	A denial of service vulnerability has been reported in multiple web servers. Remote attackers can exploit this issue by sending HTTP POST requests containing an overly large Content-Length header value to the target. Successful exploitation can result in a denial of service condition on the affected server.

Protection Overview

IPS will detect and block specially crafted HTTP requests sent to the server.

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 Web Servers HTTP POST Overly Large Content-Length Denial of Service 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: Web Server Enforcement Violation.
Attack Information: Web Servers HTTP POST Overly Large Content-Length Denial of Service