Category:OWASP ModSecurity Core Rule Set Project

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OWASP ModSecurity Core Rule Set (CRS)

The OWASP ModSecurity CRS Project's goal is to provide an easily "pluggable" set of generic attack detection rules that provide a base level of protection for any web application.


The OWASP ModSecurity CRS is a set of web application defense rules for the open source, cross-platform ModSecurity Web Application Firewall (WAF).


The OWASP ModSecurity CRS provides protections if the following attack/threat categories:

  • HTTP Protection - detecting violations of the HTTP protocol and a locally defined usage policy.
  • Real-time Blacklist Lookups - utilizes 3rd Party IP Reputation
  • HTTP Denial of Service Protections - defense against HTTP Flooding and Slow HTTP DoS Attacks.
  • Common Web Attacks Protection - detecting common web application security attack.
  • Automation Detection - Detecting bots, crawlers, scanners and other surface malicious activity.
  • Integration with AV Scanning for File Uploads - detects malicious files uploaded through the web application.
  • Tracking Sensitive Data - Tracks Credit Card usage and blocks leakages.
  • Trojan Protection - Detecting access to Trojans horses.
  • Identification of Application Defects - alerts on application misconfigurations.
  • Error Detection and Hiding - Disguising error messages sent by the server.


OWASP ModSecurity CRS is free to use. It is licensed under the Apache Software License version 2 (ASLv2), so you can copy, distribute and transmit the work, and you can adapt it, and use it commercially, but all provided that you attribute the work and if you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.

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What is OWASP ModSecurity CRS?

OWASP ModSecurity CRS provides:

  • Baseline protection for common web application attacks.


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License: ASLv2
Project Type Files CODE.jpg

funds to OWASP earmarked for ModSecurity Core Rule Set Project.



XXX is developed by a worldwide team of volunteers. The primary contributors to date have been:

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As of XXX, the priorities are:

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Involvement in the development and promotion of XXX is actively encouraged! You do not have to be a security expert in order to contribute. Some of the ways you can help:

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What does this OWASP project offer you?
What releases are available for this project?
what is this project?
Name: OWASP ModSecurity Core Rule Set Project (home page)
Purpose: ModSecurity is an Apache web server module that provides a web application firewall engine. The ModSecurity Rules Language engine is extrememly flexible and robust and has been referred to as the "Swiss Army Knife of web application firewalls." While this is certainly true, it doesn't do much implicitly on its own and requires rules to tell it what to do. In order to enable users to take full advantage of ModSecurity out of the box, we have developed the Core Rule Set (CRS) which provides critical protections against attacks across most every web architecture.

Unlike intrusion detection and prevention systems, which rely on signatures specific to known vulnerabilities, the CRS is based on generic rules which focus on attack payload identification in order to provide protection from zero day and unknown vulnerabilities often found in web applications, which are in most cases custom coded.

License: Apache Software License v2 (ASLv2)
who is working on this project?
Project Leader(s):
Project Contributor(s):
  • Breno Silva
how can you learn more?
Project Pamphlet: Not Yet Created
Project Presentation: View
Mailing list: Mailing List Archives
Project Roadmap: View
Main links:
Key Contacts
  • Contact the GPC to report a problem or concern about this project or to update information.
current release
ModSecurity 2.2.0 - 05/26/2011 - (download)
Release description:
  • Improvements:

- Changed Licensing from GPLv2 to Apache Software License v2 (ASLv2) - Created new INSTALL file outlining quick config setup - Added a new rule regression testing framework to the /util directory - Added new activated_rules directory which will allow users to place symlinks pointing to files they want to run. This allows for easier Apache Include wild-carding - Adding in new RULE_MATURITY and RULE_ACCURACY tags - Adding in a check for X-Forwarded-For source IP when creating IP collection - Added new Application Defect checks (55 app defect file) from Watcher tool (Check Charset) - Added new AppSensor rules to experimental_dir - Added new Generic Malicious JS checks in outbound content - Added experimental IP Forensic rules to gather Client hostname/whois info - Added support for Mozilla's Content Security Policy (CSP) to the experimental_rules - Global collection in the 10 file now uses the Host Request Header as the collection key. This allows for per-site global collections. - Added new SpiderLabs Research (SLR) rules directory (slr_rules) for known vulnerabilties. This includes both converted web rules from Emerging Threats (ET) and from SLR Team. - Added new SLR rule packs for known application vulns for WordPress, Joomla and phpBB - Added experimental rules for detecting Open Proxy Abuse - Added experimental Passive Vulnerability Scanning ruleset using OSVDB and Lua API - Added additional URI Request Validation rule to the 20 protocol violations file (Rule ID - 981227) - Added new SQLi detection rules (959070, 959071 and 959072) - Added "Toata dragostea mea pentru diavola" to the malicious User-Agent data

  • Bug Fixes:

- Assigned IDs to all active SecRules/SecActions - Removed rule inversion (!) from rule ID 960902 - Fixed false negative issue in Response Splitting Rule - Fixed false negative issue with @validateByteRange check - Updated the TARGETS lising for rule ID 950908 - Updated TX data for REQBODY processing - Changed the pass action to block in the RFI rules in the 40 generic file - Updated RFI regex to catch IP address usage in hostname - Changed REQUEST_URI_RAW variable to REQUEST_LINE in SLR rules to allow matches on request methods. - Updated the RFI rules in the 40 generic attacks conf file to remove explicit logging actions. They will now inherit the settings from the SecDefaultAction

Rating: Yellow button.JPG Not Reviewed - Assessment Details
last reviewed release
ModSecurity 2.0.6 - 2010-02-26 - (download)
Release description: ModSecurity is a web application firewall that can work either embedded or as a reverse proxy. It provides protection from a range of attacks against web applications and allows for HTTP traffic monitoring, logging and real-time analysis.
Rating: Greenlight.pngGreenlight.pngGreenlight.png Stable Release - Assessment Details

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Pages in category "OWASP ModSecurity Core Rule Set Project"

The following 4 pages are in this category, out of 4 total.