Security Onion is a free and open Linux distribution for threat hunting, enterprise security monitoring, and log management. It was developed by Doug Burks in 2008. Its first release was in 2009. It was originally based on Xubuntu 10.04.
Version 2.4.140 was released on March 24, 2025.
Security Onion combines various tools and technologies to provide a robust IDS solution, including:
Snort
Suricata and Zeek (formerly Bro): These are network-based IDS tools that monitor network traffic for suspicious activities.
OSSEC: A host-based IDS that monitors system logs and file integrity.
Elasticsearch, Logstash, and Kibana (ELK stack): These tools are used for log management and analysis, allowing for effective visualization and querying of security events.
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