A key concept in security is ensuring that your server’s operating system is adequately secured, or “hardened”. All too often server administrators will focus on security at their application layer such as a webserver with dynamic content. While this is absolutely important, one must not forget to harden their server’s operating system to prevent against initial exploitation and consequently post-exploitation attacks such as privilege escalation. Operating system hardening should be implemented before any services are hosted, whether the system be in a production or development environment. The following tips and tricks are some easy ways to quickly harden an Ubuntu server....
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