The OWASP ModSecurity Core Rule Set or CRS is a set of generic attack detection rules for use with ModSecurity or compatible web application firewalls.
It aims to protect web applications from a wide range of attacks, including the OWASP Top Ten, with a minimum of false alerts.
Also ReadXSS Fuzzer : Tool Which Generates XSS Payloads Based On User-Defined Vectors & Fuzzing Lists
It provides protection against many common attack categories, including:
| SQL Injection (SQLi) Cross Site Scripting (XSS) Local File Inclusion (LFI) Remote File Inclusion (RFI) PHP Code Injection Java Code Injection New in CRS 3.1! | HTTPoxy Shellshock Unix/Windows Shell Injection Session Fixation Scripting/Scanner/Bot Detection Metadata/Error Leakages |
It requires an Apache/IIS/Nginx web server with ModSecurity 2.8.0 or higher.
git clone https://github.com/SpiderLabs/owasp-modsecurity-crs.git
After download, copy crs-setup.conf.example to crs-setup.conf. Optionally edit this file to configure your CRS settings. Then include the files in your webserver configuration:
Include /.../crs-setup.conf
Include /.../rules/*.confFor detailed installation instructions, see the INSTALL document. Also review the CHANGES and KNOWN_BUGS documents.
You can update the rule set using the included script util/upgrade.py.
Advanced features are explained in the crs-setup.conf and the rule files themselves. The crs-setup.conf file is generally a very good entry point to explore the features of the CRS.
We are trying hard to reduce the number of false positives (false alerts) in the default installation. But sooner or later, you may encounter false positives nevertheless.
The OWASP ModSecurity Core Rule Set is distributed under Apache Software License (ASL) version 2. Please see the enclosed LICENSE file for full details.
Credit: Chaim Sanders, Walter Hop & Christian Folini
You can follow us on Linkedin, Twitter, Facebook for daily Cybersecurity updates also you can take the Best Cybersecurity courses online to keep your self-updated.
Journalists use OSINT to verify public information before publishing. In 2026, misinformation, AI-generated images, fake…
Docker is an open-source platform that lets you package and run applications inside containers. Each container…
PostgreSQL (often called Postgres) is an open-source relational database system. It supports advanced features like JSON…
Xrdp is an open-source server that lets you connect to your Ubuntu machine from another computer…
Apache Tomcat is an open-source web server and Java servlet container. It is one of the…
Keeping your Ubuntu system updated is one of the best ways to protect it. Security…