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2 points

Ubuntu has a set of scripts you can run to harden a new server (not advisable on a server that has already been configured for something). You need an Ubuntu Pro subscription to access them but you can get a free trial and then cancel it after you’ve finished.

More info at https://ubuntu.com/security/cis.

I did this process for a customer recently and it was pretty straightforward and much much more thorough (over 100 configuration changes) than just tweaking SSH and fail2ban.

I expect other commercially-oriented distros offer something similar.

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3 points

Leak the scripts?

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1 point

Fwiw you don’t need to cancel or trial anything. Everyone can get free Ubuntu pro licensesbfor up to 5 machines

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