Linux Security: The Seven Most Deadly Sins JUN 20, 2003 By Bob Toxen. Article is provided courtesy of Prentice Hall PTR.
The difference between Linux and Windows, according to Bob Toxen, is that with knowledge and a little effort, Linux can be made very secure. However, there are seven problems that affect all unhardened Linux systems regardless of their use. Indulge any of these seven sins and almost certainly your systems will be broken into in one to twelve months. In this detailed excerpt from his book, Real World Linux Security, Bob lays out no-nonsense, thoroughly explained, practical advice that will boost the security of an "out of the box" Linux system by an order of magnitude.
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Source: InformIT