This detailed article tackle filesystem defenses, dynamic firewalls, and other in-depth defense topics. This article uncovers the hidden treasures locked within syslog, Linux's little-known, but very important message and logging facility. The paper is an analysis of the compromise of one professor's machine following a rash of attacks on some workstations at the University of Alberta's Department of Mathematical Sciences, many of which run on RedHat 5.1. It is a great source if you find that you been cracked and need to clean up the mess. Here are tips for checking file integrity, monitoring log files, securing host and network utility programs, and more.
Open source does present more unknowns than a traditional commercial software model.
This article unveils Red Hat's upgrade of Linux that lets system managers significantly tighten the security of their networks, as well as more easily install and configure the operating system. We think this link will satisfy your every whim. You'll find dozens upon dozens of resources and links here. The article offers an explanation as to why there is a large lag time between awareness of a security hole and awareness of the patch which fills it. The article ends with a Linux patch, but in general the information is useful to any Unix administrator.