Last month, a cloud engineer updated all the Linux servers to disallow telnet communication by updating the firewall and uninstalling the application. However, it was recently discovered that three of

Rebuilding servers weekly is an extreme and inefficient measure that causes significant downtime and operational overhead, without directly addressing the root cause of configuration drift or unauthorized changes.

Disabling local administrator accounts and changing passwords might prevent some unauthorized changes but does not enforce a desired configuration state across all servers or remediate existing configuration drift.

A configuration management system, such as Ansible or Chef, allows for defining the desired state of servers as code, enabling automated deployment and continuous enforcement of configurations. It can detect and automatically revert any unauthorized changes, ensuring that security policies like disabling Telnet are consistently maintained across all Linux servers.

Reviewing logs to find who made changes is a reactive forensic step and an administrative action, not a proactive technical solution to implement and maintain a consistent configuration across systems.