Linux Hardening Tips

The following are a few resources related to hardening Linux implementations.

Linux Basics

• Null-byte Linux Basics.
• Kali Linux Revealed Free Course

Cool Ways to Test Your Linux Knowledge

• Overthewire: Bandit
• Tryhackme: Linux Modules

Benchmarks and Hardening Guides

• CIS Benchmarks
• DoD Security Technical Implementation Guides (STIGs)
• Quickly build STIG-compliant Amazon Machine Images using Amazon EC2 Image Builder
• How to Secure and Harden Cloud VM (Ubuntu & CentOS)?
• How To Harden OpenSSH on Ubuntu 20.04
• Digital Ocean Security Hardening and General Security Blog Posts

Linux Security Modules

• SELinux
• AppArmor
• Smack
• Tomoyo Linux

Additional Resources

• Linux Kernel Exploitation
• The Linux Auditing Framework
• DevSec Linux Baseline
• Security Content Automation Protocol (SCAP)
• Linux Privilege Checker