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Someone will eventually answer the question that has seen a virus in linux but in the 3 yrs that I've been using linux, I haven't experienced 1. Most viruses that are floating around are said to be more windows executeables rather than linux.
Folks do not understand the simple truth - every virus needs to exploit a vulnerability in order to do its work.
Say, I want to write a virus for Windows. Easy task. There are hundreds (possibly thousands) of security holes to exploit. Once I penetrate the victims defenses I'm in, I'm the boss, I can do anything, I own it.
OTOH, writing a successful virus for POSIX compliant operating systems is a daunting task.
First, they do not have lots of vulnerabilities.
Second, even if I can find one it will not give me unlimited rights, most likely I will just be stopped by another layer of security (unless some stoopid user is using the box as root, in which case I'm in for good).
Third, those few vulnerabilities in POSIX systems are fixed in hours after they are discovered. While hundreds of Windows security holes are not addressed at all. A year ago Microsoft made news by fixing a security hole which was known for 19 years ... do I need to say more?