Top Linux/UNIX security threats
It's depressing for security professionals to see just how many of the vulnerabilities on the new SANS/FBI Top 20 List have CVE numbers in the 1999-xxxx range--meaning that they were identified and fixed years ago on some systems.
Create a Linux boot CD
There are three constants in life: death, taxes, and system crashes. All three may be inevitable, but at least you can recover from a system crash.
Track network connections with LSOF on Linux
LSOF provides verbose output and is useful in tracking down all sorts of information. For example, it allows you to see what program is operating on an open port, which daemons have established connections, and what ports are open on your server.
Police your net with PortSentry
In an ideal world, we would hire someone to sit in front of a screen 24/7 and watch as the log churns through the incoming (and often outgoing) hits. This, of course, isn't an ideal world, and very few organisations have the resources for such a menial task.
Secure Linux from buffer overflows
One of the more common types of attacks directed at Linux systems comes in the form of buffer overflows, which have accounted for more than 50 percent of CERT advisories.
Improve your Linux security: Stop unnecessary services
Although the default installation scripts that come with various Linux distribution CDs make it easy to install Linux, they also add a vast number of services to your system, which, at best, you'll probably never use, or at worst, leave ports open to external break-ins.
Firewall tips: Lock it down quickly with Linux Lokkit
Have you ever needed to get a firewall up and running fast and didn't have the tools that allowed such quick setup? Well, the Linux Lokkit tool may be just what you need.
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