There was an interesting post on Ask Slashdot discussing the ethics of releasing non-malicious Linux malware to simply prove a point to all of the people who rant and rave about Linux being so secure.  A developer by the name of buchner.johannes
buchner.johannes writes:
“I was fed up with the general consensus that Linux is oh-so-secure and [...]

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It has been announced that Security-Enhanced Linux (SELinux) will now be available as an alternative security option to AppArmour in Ubuntu 8.04 “Hardy Heron”.
Security-Enhanced Linux (SELinux) is a Linux feature that provides a variety of security policies, including U.S. Department of Defense style mandatory access controls, through the use of Linux Security Modules (LSM) in [...]

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William Stearns has a good write up on Linux security tips for first time Linux users.
Here are a few:

Set up regular updates for your particular Linux distribution
Lock your system when you step away from it. To lock the Gnome graphical desktop, run the following command, part of the “gnome-screensaver” package:gnome-screensaver-command –lockFrom a text console, [...]

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You can never be too safe these days. Viruses, spyware, rootkits, remote exploits, you just never know what security issue is going to be your downfall. That’s why it is important as a Linux administrator to have an understanding of some of the best Linux security tools available to you. In this article, you will [...]

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David Kierznowski has uncovered an exploit in the popular Wordpress blogging software that everyone should be aware of. Popular security website Security Focus has the issue documented, and it is suggested that you upgrade your template.php file as soon as possible to avoid becoming a victim.
The Wordpress team has issued an updated release, version 2.0.6 [...]

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Safepasswd is a website dedicated to helping you choose a safe and secure password. The secure passwords are automatically generated for you, allowing you the following options: easy to remember, letters only, numbers only, letters and numbers, all characters, and hex. This is a great tool for both administrators and standard computer users, as it [...]

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SecurityFocus’ Mikhael Felker has written part two of his analysis of the security mechanisms, risks, attacks, and defenses of the two most commonly used password management systems: those found in Internet Explorer and Firefox.
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Michael Stutz from Linux.com had the chance to interview the author of the Linux Administrators’ Security Guide and proprietor of a popular security mailing list, Kurt Seifried.
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SSH is a powerful remote logging protocol that took the place of telnet back in the mid-to-late 90’s. With so many people using SSH as an every day tool, it is important for server administrators to understand some ways of making the secure shell a bit more… well… secure. In this article you will [...]

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If you are a system administrator who allows remote access to your server or desktop, you may want to disable certain users from logging into the system both remotely and locally. This article will explain how to prevent certain users from logging into your Linux machine via SSH (OpenSSH_4.4p1) and FTP (vsftpd 2.0.5).
First we must [...]

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