Top 5 Intrusion Detection Systems

After the tremendously successful 2000 and 2003 security tools surveys, Insecure.Org is delighted to release this 2006 survey. I (Fyodor) asked users from the nmap-hackers mailing list to share their favorite tools, and 3,243 people responded. This allowed me to expand the list to 100 tools, and even subdivide them into categories. This is the category page for intrusion detection systems -- the full network security list is available here. Anyone in the security field would be well advised to go over the list and investigate tools they are unfamiliar with. I discovered several powerful new tools this way. I also point newbies to this site whenever they write me saying “I don't know where to start”.

Respondents were allowed to list open source or commercial tools on any platform. Commercial tools are noted as such in the list below. No votes for the Nmap Security Scanner were counted because the survey was taken on a Nmap mailing list. This audience also biases the list slightly toward “attack” hacking tools rather than defensive ones.

Each tool is described by one ore more attributes:

	Did not appear on the 2003 list
	Generally costs money. A free limited/demo/trial version may be available.
	Works natively on Linux
	Works natively on OpenBSD, FreeBSD, Solaris, and/or other UNIX variants
	Works natively on Apple Mac OS X
	Works natively on Microsoft Windows
	Features a command-line interface
	Offers a GUI (point and click) interface
	Source code available for inspection.

Please send updates and suggestions (or better tool logos) to Fyodor. If your tool is featured or you think your site visitors might enjoy this list, you are welcome to use our link banners. Here is the list, starting with the most popular:

#1

Snort : Everyone's favorite open source IDS This lightweight network intrusion detection and prevention system excels at traffic analysis and packet logging on IP networks. Through protocol analysis, content searching, and various pre-processors, Snort detects thousands of worms, vulnerability exploit attempts, port scans, and other suspicious behavior. Snort uses a flexible rule-based language to describe traffic that it should collect or pass, and a modular detection engine. Also check out the free Basic Analysis and Security Engine (BASE), a web interface for analyzing Snort alerts. Open source Snort works fine for many individuals, small businesses, and departments. Parent company SourceFire offers a complimentary product line with more enterprise-level features and real-time rule updates. They offer a free (with registration) 5-day-delayed rules feed, and you can also find many great free rules at Bleeding Edge Snort.

#2

OSSEC HIDS : An Open Source Host-based Intrusion Detection System OSSEC HIDS performs log analysis, integrity checking, rootkit detection, time-based alerting and active response. In addition to its IDS functionality, it is commonly used as a SEM/SIM solution. Because of its powerful log analysis engine, ISPs, universities and data centers are running OSSEC HIDS to monitor and analyze their firewalls, IDSs, web servers and authentication logs.

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#3

Fragroute/Fragrouter : A network intrusion detection evasion toolkit Fragrouter is a one-way fragmenting router - IP packets get sent from the attacker to the Fragrouter, which transforms them into a fragmented data stream to forward to the victim. Many network IDS are unable or simply don't bother to reconstruct a coherent view of the network data (via IP fragmentation and TCP stream reassembly), as discussed in this classic paper. Fragrouter helps an attacker launch IP-based attacks while avoiding detection. It is part of the NIDSbench suite of tools by Dug Song. Fragroute is a similar tool which is also by Dug Song.

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#4

BASE : The Basic Analysis and Security Engine BASE is a PHP-based analysis engine to search and process a database of security events generated by various IDSs, firewalls, and network monitoring tools. Its features include a query-builder and search interface for finding alerts matching different patterns, a packet viewer/decoder, and charts and statistics based on time, sensor, signature, protocol, IP address, etc.

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#5

Sguil : The Analyst Console for Network Security Monitoring Sguil (pronounced sgweel) is built by network security analysts for network security analysts. Sguil's main component is an intuitive GUI that provides realtime events from Snort/barnyard. It also includes other components which facilitate the practice of Network Security Monitoring and event driven analysis of IDS alerts.

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