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


Check Point Reference: CPAI-2014-1181
Date Published:
Last Updated:
Source: Nginx
Industry Reference(s): CVE-2013-4547
Protection Provided by: Security Gateway
  • R75 and above
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, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R70 / R71 / R75 and above

How Can I Protect My Network?

  1. 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.
  2. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name:  Web Server Enforcement Violation.
Attack Information:  Nginx Request URI Verification Security Bypass