Check the security of your Linux box with this comprehensive open source security auditing tool
"Have you ever thought about how secure your Linux machine really is? There are numerous Linux distros, each with its own default settings, on which you run dozens of software packages with different version numbers, and numerous services running in the background, which we hardly know or care about.
To find the security posture - the overall security status of the software, network, and services running on your Linux machine - you could run a few commands and get bits and pieces of relevant information, but the amount of data you need to parse is huge..."
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