CNTR-K8-001420 - Kubernetes Kubelet must have the SSL Certificate Authority set.

Information

Kubernetes container and pod configuration are maintained by Kubelet. Kubelet agents register nodes with the API Server, mount volume storage, and perform health checks for containers and pods. Anyone who gains access to Kubelet agents can effectively control applications within the pods and containers. 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 API Server with a means to be able to authenticate sessions and encrypt traffic.

To enable encrypted communication for Kubelet, the client-ca-file must be set. This parameter gives the location of the SSL Certificate Authority file used to secure Kubelet communication.

Solution

Edit the Kubernetes Kubelet file in the /etc/sysconfig/ directory on the Kubernetes Master Node. Set the value of client-ca-file to path containing Approved Organizational Certificate.

Reset Kubelet service using the following command:
service kubelet restart

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Kubernetes_V1R5_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-23, CAT|II, CCI|CCI-001184, Rule-ID|SV-242420r799987_rule, STIG-ID|CNTR-K8-001420, Vuln-ID|V-242420

Plugin: Unix

Control ID: e4197ee4657782a87f4e43e5e01dcfabe61eb4bdf1ce755d24fec3c156dc8d3e