cybercore

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Free, open source package designed to detect Trojans, viruses, malware and other malicious threats. Included in the software, which now comes preinstalled in several Linux distributions, are a multithreaded scanning daemon, command line utilities for on-demand file scanning, and an intelligent tool for automatic signature updates. Of particular note for past or current Windows users is that the core ClamAV library is also used in Immunet 3.0, a sister solution for Microsoft's operating system.







Snort

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Also offered by Sourcefire is Snort, an open source network intrusion prevention and detection system that combines the benefits of signature, protocol and anomaly-based inspection. With millions of downloads and more than 300,000 registered users to its credit, Snort is the most widely deployed such technology worldwide, Sourcefire says.








Wireshark



Wireshark is a network protocol analyzer that lets you capture and interactively browse the traffic running on a computer network. The software runs not just on Linux but on Windows, OS X, Solaris, FreeBSD and NetBSD, as well. Captured network data can be browsed via GUI or via the TTY-mode TShark utility.






John the Ripper



John the Ripper is a free and open source password cracker that can help you detect weak passwords. It's distributed primarily in source code form, but native "pro" versions are available for both Linux and Macs as well.

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Another similar tool, incidentally, is Link Removed - Invalid URL.









NMAP



Short for "Network Mapper," Nmap is a free and open source utility for network exploration or security auditing, but it can also be useful for network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap runs on all major computer operating systems. Oddly, it has even been featured in movies including The Matrix Reloaded, The Bourne Ultimatum and The Girl with the Dragon Tattoo.







Chkrootkit



Chkrootkit is a free tool designed to check locally for signs of a rootkit infection on your Linux machine. The free software is a very popular choice, but Rootkit Hunter is another, like-minded alternative.








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With more than five million downloads to date, Nessus is one of the most popular vulnerability scanners in the world, its makers say. The proprietary software features high-speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture. Personal use of Nessus is free.

There are, of course, countless other security tools for Linux out there, many of them excellent as well.



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The provided text contains information about various security tools for Linux systems. Here's a breakdown of the tools mentioned:

ClamAV​

  • Description: Package designed to detect Trojans, viruses, malware, and other malicious threats.
  • Components: Multithreaded scanning daemon, command-line utilities for on-demand file scanning, and an intelligent tool for automatic signature updates.
  • Usage: Preinstalled in several Linux distributions.
  • Note: Core ClamAV library is used in Immunet 3.0, a solution for Windows.

Snort​

  • Description: Open-source network intrusion prevention and detection system.
  • Features: Combines signature, protocol, and anomaly-based inspection.
  • Popularity: Widely deployed technology with millions of downloads and a large user base.

Wireshark​

  • Description: Network protocol analyzer for capturing and interactively browsing network traffic.
  • Compatibility: Runs on Linux, Windows, OS X, Solaris, FreeBSD, and NetBSD.
  • Utilities: GUI for browsing captured data and TShark utility for TTY-mode browsing.

John the Ripper​

  • Description: Free and open-source password cracker.
  • Purpose: Helps detect weak passwords.
  • Availability: Distributed in source code form with native versions available for Linux and Mac platforms.

Nmap​

  • Description: Free and open-source utility for network exploration, security auditing, network inventory, and managing service upgrades.
  • Platforms: Compatible with all major operating systems.
  • Interesting Fact: Featured in various movies like The Matrix Reloaded and The Bourne Ultimatum.

Chkrootkit​

  • Description: Free tool to check for rootkit infections on Linux machines.
  • Alternatives: Mentioned Rootkit Hunter as a similar alternative.

Nessus​

  • Description: Popular vulnerability scanner with over five million downloads.
  • Features: High-speed discovery, configuration auditing, asset profiling, sensitive data discovery, and vulnerability analysis.
  • Pricing: Personal use of Nessus is free.
These tools provide essential security features for Linux systems, covering aspects such as malware detection, network monitoring, password security, vulnerability scanning, and rootkit detection. Each tool serves a unique purpose in enhancing the security posture of Linux environments.