Assigning self-specified UIDs to containers ensures greater isolation between container and host environments, reducing the risk of privilege escalation. This practice strengthens security by preventing UID overlaps that could be exploited by attackers.
Isolation of User Contexts: Assigning unique UIDs to containers ensures that even if a container is compromised, the attacker cannot inherit host-level privileges. The unique UID confines the attacker to the container's permissions.
Mitigation of Privilege Escalation: Preventing UID overlap between the host and containers is critical to avoiding privilege escalation. If a container's UID matches that of a privileged host user, breaking out of the container could grant the attacker elevated access on the host. Unique UIDs avert this risk.
Reduced Attack Surface: Assigning UIDs from the upper third of the UID range minimizes the risk of collision with common system processes or users. This practice ensures that the attacker cannot predict or exploit the environment easily.
By carefully selecting self-specified UIDs that do not overlap with host UIDs, you enhance the isolation between the container and the host environment, significantly reducing the risk of privilege escalation and unauthorized access.
