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Linux Hardening - what are you must-haves? (infosec.pub)

submitted 10 months ago by wop@infosec.pub to c/cybersecurity@infosec.pub

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I'm working on a guide focused on securing Linux servers and I'd like to ask you what your essential hardening techniques and tips are? Your feedback would be greatly appreciated

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[–] cron@feddit.de 3 points 10 months ago

Not a full list, just some ideas for personal servers.

Make sure that only the services are exposed that you want to have exposed. For example, a webserver with PHP and mariadb probably does not need to have mariadb reachable from the network.
Check the default config of all the programs you install. The default is often not the most secure option.
Have secure authentication on every service on the server. Change all the default passwords.
DO NOT disable security features like selinux.
Document your setup, the specific changes you made and make and test backups.

Please be aware that the requirements in a business environment might be different.