ModSecurity is a web application firewall that provides a layer of security between web applications and the internet. It’s an open-source software module that can be loaded into the web server (e.g., Apache or Nginx) to monitor and filter HTTP traffic.

ModSecurity is designed to protect web applications from various attacks, including SQL injection, cross-site scripting (XSS), remote file inclusion, and other web-based attacks. It works by examining incoming HTTP requests and responses and applying rules to identify and block malicious traffic.

ModSecurity uses a rule-based language to define security policies that determine how traffic is handled. These rules can be customized to meet the specific needs of an application or environment. ModSecurity also provides a range of built-in rules and plugins to detect and prevent common web-based attacks.

In addition to its core functionality as a web application firewall, ModSecurity also provides advanced logging and reporting features to help administrators monitor and analyze traffic. It can log data at various levels of detail, from basic traffic information to full HTTP request and response bodies.

ModSecurity is widely used in the industry and is supported by a large community of developers and users. Its modular architecture and extensive configuration options make it a flexible and powerful tool for securing web applications.

More information at https://github.com/spiderLabs/ModSecurity