Agent skill

implementing-web-application-logging-with-modsecurity

Configure ModSecurity WAF with OWASP Core Rule Set (CRS) for web application logging, tune rules to reduce false positives, analyze audit logs for attack detection, and implement custom SecRules for application-specific threats. The analyst configures SecRuleEngine, SecAuditEngine, and CRS paranoia levels to balance security coverage with operational stability. Activates for requests involving WAF configuration, ModSecurity rule tuning, web application audit logging, or CRS deployment.

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SKILL.md

Implementing Web Application Logging with ModSecurity

Overview

ModSecurity is an open-source WAF engine that works with Apache, Nginx, and IIS. The OWASP Core Rule Set (CRS) provides generic attack detection rules covering SQL injection, XSS, RCE, LFI, and other OWASP Top 10 attacks. ModSecurity logs full request/response data in audit logs for forensic analysis and generates alerts that feed into SIEM platforms.

When to Use

  • When deploying or configuring implementing web application logging with modsecurity capabilities in your environment
  • When establishing security controls aligned to compliance requirements
  • When building or improving security architecture for this domain
  • When conducting security assessments that require this implementation

Prerequisites

  • Web server (Apache 2.4+ or Nginx) with ModSecurity v3 module
  • OWASP CRS v4.x installed
  • Log aggregation infrastructure (ELK, Splunk, or Wazuh)

Steps

  1. Install ModSecurity and configure SecRuleEngine in DetectionOnly mode
  2. Deploy OWASP CRS v4 and set paranoia level (PL1-PL4)
  3. Configure SecAuditEngine for relevant-only logging
  4. Tune false positives with SecRuleRemoveById and rule exclusions
  5. Switch to blocking mode (SecRuleEngine On) after tuning period
  6. Forward audit logs to SIEM for correlation and alerting

Expected Output

ModSecurity: Warning. Pattern match "(?:union\s+select)" [file "/etc/modsecurity/crs/rules/REQUEST-942-APPLICATION-ATTACK-SQLI.conf"] [line "45"] [id "942100"] [msg "SQL Injection Attack Detected via libinjection"] [severity "CRITICAL"]

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