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Integration of The Hive, once Security Onion's Hybrid Hunter code becomes production-ready, will make it possible for SOC analysts to escalate events in Kibana to active incident response cases. What made us perk up, however, was the alpha release of their new Hybrid Hunter software, which includes The Hive, an open-source incident response platform. Security Onion is under active development, and their public roadmap includes a move away from Debian package deployment to using Docker to support RHEL/CentOS systems more easily. And if that’s what you’re looking for you’ll never find it." What's next for Security Onion? Security Onion isn’t a silver bullet that you can set up, walk away from and feel safe. "While automation and correlation can enhance intelligence and assist in the process of sorting through false positives and malicious indicators," the Security Onion documentation states, "there is no replacement for human intelligence and awareness. In their defense, Security Onion rightly points out in their documentation that security monitoring is a process, not a product, and spending a bunch of money on a product is not going to make your security woes magically disappear. Will your SOC be able to survive the false positive rate? That's a question that enterprise security teams will have to consider carefully before deciding to deploy Security Onion in a busy and alert-noisy production environment. Sniffing all the things on your networks and devices is feasible using Security Onion. The big challenge in SOCs today, though, is an avalanche of false positives.

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(The creators of Security Onion naturally also offer a paid consultancy service for those who want to stick to auditable free software and avoid vendor lock-in or recurring annual fees.) If all those options create decision paralysis, the website boasts that the "easy-to-use setup wizard allows you to build an army of distributed sensors for your enterprise in minutes!" Your mileage may vary, of course. That's still a lot of data to dig through for indicators of compromise (IoCs), so Security Onion also comes with Sguil (and its browser-based cousin Squert), which lets SOC analysts view all Snort, Suricata and Wazuh alerts in one place, and also allows pivoting from alert into the relevant packet capture.

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Kibana includes the ability to pivot to full packet capture and dig into the specifics of a suspected security incident. Logstash collects all the logs, Elasticsearch indexes them to make them easily searchable, and Kibana lets you visualize and analyze what's going on from the safety of your security operation center (SOC).

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Security Onion is at its core an Elasticsearch, Logstash and Kibana (ELK) stack, plus a ton of other bells and whistles, including the Wazuh fork of the OSSEC HIDS, both the Snort and Suricata rule-based NIDS, as well as the analysis-driven NIDS Zeek (formerly known as Bro). How does Security Onion work?īuzzword warning: ELK stack.

With its witty slogan, "Peel back the layers of security in your enterprise," it offers full packet capture, both network-based and host-based intrusion detection systems (NIDS and HIDS, respectively), but also includes powerful indexing, search, visualization and analysis tools to make sense of those mountains of data. Security Onion is a free and open source intrusion detection system (IDS), security monitoring, and log management solution. Security Onion is looking more and more polished with every year that passes, and it may be worth considering if you've got a deep enough security bench to customize, deploy and maintain Security Onion for your enterprise. Will you need skilled security people to run it? Definitely yes. Will you have to tweak it to fit your enterprise? Probably yes.

Does Security Onion do exactly what you want it to do? Probably not.

The same dynamic may be developing in the enterprise intrusion detection, network security monitoring and log management space, where VC-backed security offerings with eye-watering price tags go head to head with the free/libre Security Onion Linux distribution. Fast forward to today, and Linux has conquered basically every field except for the desktop market. Back in the early oughts, a common complaint about Linux was that while it was free/libre, it came with no support and you had to pay expensive senior sysadmins to run Linux systems.