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Kubernetes Controller Manager must have the SSL Certificate Authority set.


Finding ID Version Rule ID IA Controls Severity
V-242421 CNTR-K8-001430 SV-242421r863996_rule Medium
The Kubernetes Controller Manager is responsible for creating service accounts and tokens for the API Server, maintaining the correct number of pods for every replication controller and provides notifications when nodes are offline. Anyone who gains access to the Controller Manager can generate backdoor accounts, take possession of, or diminish system performance without detection by disabling system notification. Using authenticity protection, the communication can be protected against man-in-the-middle attacks/session hijacking and the insertion of false information into sessions. The communication session is protected by utilizing transport encryption protocols, such as TLS. TLS provides the Kubernetes Controller Manager with a means to be able to authenticate sessions and encrypt traffic.
Kubernetes Security Technical Implementation Guide 2022-12-02


Check Text ( C-45696r863851_chk )
Change to the /etc/kubernetes/manifests/ directory on the Kubernetes Control Plane. Run the command:
grep -i root-ca-file *

If the setting client-ca-file is not set in the Kubernetes Controller Manager manifest file or contains no value, this is a finding.
Fix Text (F-45654r863852_fix)
Edit the Kubernetes Controller Manager manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Set the value of root-ca-file to path containing Approved Organizational Certificate.