Check Point Advisories

Nginx Request URI Verification Security Bypass (CVE-2013-4547)

Vulnerability
Protection

Check Point Reference:	CPAI-2014-1181
Date Published:	26 Mar 2014
Severity:	High
Last Updated:	Sunday 29 April, 2018
Source:	Nginx
Industry Reference:	CVE-2013-4547
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	nginx HTTP Server 1.5.x prior to 1.5.7 nginx HTTP Server 1.x prior 1.4.4
Vulnerability Description	There exists a security bypass vulnerability in Nginx. The vulnerability is caused by improper handling of unescaped space characters within URIs. A remote attacker can exploit this vulnerability to bypass security restrictions in certain configurations.

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 Nginx Request URI Verification Security Bypass 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: Nginx Request URI Verification Security Bypass