Delinea Explained: Tier 0 Server Security

Tier Zero servers refer to the most critical systems within an organisation's infrastructure, such as domain controllers, databases, and core Unix servers, whose compromise would have a significant impact on business operations. These assets are prime targets for attackers who exploit lateral movement using privileged credentials or SSH keys to access and control multiple systems. Once a Tier Zero asset like Active Directory is compromised, the result can be a complete operational shutdown. Securing these systems involves implementing privileged access management (PAM) strategies such as vaulting root and administrator accounts, applying multi-factor authentication, and ensuring users never directly see or handle sensitive credentials.

An effective approach to securing Tier Zero workloads include deploying agent-based solutions like Privilege Control for Servers. These agents are installed on critical systems to enforce individualised security, preventing lateral movement and unauthorised access even if credentials are valid. The solution supports just-in-time access workflows, time-based access controls, and limits on executable commands, further tightening security. This layered protection ensures that access is permitted only under defined policies while tightening security. This layered protection ensures that access is permitted only under defined policies while blocking any unauthorised remote execution. By focusing efforts on securing Tier Zero systems, organisations can significantly reduce risk and maintain the integrity of their most vital digital assets.