Understanding, detecting, and preventing network attacks

Intrusion Stories

Article from Issue 106/2009

This month we look into the intruder's toolkit and investigate some prudent counter-measures for detecting and preventing attacks.

Anyone with an Internet connection has to worry about who might be connecting from the other side. Network intrusion isn't just for pranksters anymore. Spammers, credit pirates, meth addicts, and countless other n'er-do-wells are all looking for a way in. How do you keep them out? Download system updates, make use of the best available tools, and know your enemy.

We'll let you handle the system updates, since you probably already understand that yesterday's code is tomorrow's broken window. This month we focus on intrusion techniques and show you some tools for discovering and preventing attacks.

To start off this month's collection, security columnist Kurt Seifried takes a look at some recent intrusion strategies. You'll learn about SQL injection, cross-site request forgery, and HTTP parameter pollution. Next we offer a hands-on look at some tools for visualizing intrusion events. You'll get a chance to play through some real intrusion scenarios using PCAP (Packet Capture) files, and we'll show you how the text-based reports from the Snort intrusion detection system compare with the output of graphical visualization tools such as NetGrok, AfterGlow, Rumint, TNV, and Ethercape.

Finishing up this month's security set is a study of the Linux Intrusion Detection System (LIDS), an alternative to SELinux and AppArmor that provides mandatory access control and several other important security features.

Linux has never been more secure, but the fact is, the threats to your network have never been more profound. If you are looking for new tools and a deeper understanding of the intrusion detection game, keep reading. We're proud to bring you this month's Intrusion Prevention cover story.

Buy this article as PDF

Express-Checkout as PDF
Price $2.95
(incl. VAT)

Buy Linux Magazine

Get it on Google Play

US / Canada

Get it on Google Play

UK / Australia

Related content

  • Steganography Intro

    This month we look at hidden data, dastardly PDFs, safer surfing, and tools for better password control.

  • Rootkits and Linux Security

    Your Linux system may not be so airtight after all. To understand the threats, you need to think like an intruder. We'll show you what the intruders are thinking now about the Linux 2.6 kernel.

  • Detecting Intruders Intro

    If you think your systems are too obscure for an attacker to worry about, think again. Today’s intruders are happy for any victim.

  • Expert Security Intro

    Internet intruders have many ingenious ways of escalating privileges and hiding their presence once they get inside your system. The best protection is to keep them out in the cold.

  • Web Wizardry Intro

    New tools for the web appear every day. In this issue, we round up some promising technologies, including Apache's Suexec module, the new WS-Addressing standard, the Helma application server, the Perlbal web server, and microformats.

comments powered by Disqus
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters

Support Our Work

Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.

Learn More