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CIS has published hardening standards for all operating systems of EC2 in AWS.

CIS also provides hardened images as well but they're quite expensive at $130/year/instance.

Is there a place where we can get open source hardening scripts to harden EC2 to meet CIS standards?

I am looking for scripts for all operating systems.

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One place you can find open source hardening scripts is Github.

I recommend writing your own to ensure you understand exactly what is changing in the environment so if you have to troubleshoot an issue you'll have a sense of where to look and you can tailor hardening to meet your needs.

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