Rancher RKE2 runtime must maintain separate execution domains for each container by assigning each container a separate address space to prevent unauthorized and unintended information transfer via shared system resources.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-254570	SRG-APP-000243-CTR-000600	CNTR-R2-000970	SV-254570r1016539_rule	2024-12-20	2

Description
Separating user functionality from management functionality is a requirement for all the components within the Kubernetes Control Plane. Without the separation, users may have access to management functions that can degrade the Kubernetes architecture and the services being offered, and can offer a method to bypass testing and validation of functions before introduced into a production environment. Satisfies: SRG-APP-000243-CTR-000600, SRG-APP-000431-CTR-001065, SRG-APP-000211-CTR-000530, SRG-APP-000243-CTR-000595

Description

Separating user functionality from management functionality is a requirement for all the components within the Kubernetes Control Plane. Without the separation, users may have access to management functions that can degrade the Kubernetes architecture and the services being offered, and can offer a method to bypass testing and validation of functions before introduced into a production environment. Satisfies: SRG-APP-000243-CTR-000600, SRG-APP-000431-CTR-001065, SRG-APP-000211-CTR-000530, SRG-APP-000243-CTR-000595

ℹ️ Check
System namespaces are reserved and isolated. To view the available namespaces, run the command: kubectl get namespaces The namespaces to be validated include: default kube-public kube-system kube-node-lease For the default namespace, execute the commands: kubectl config set-context --current --namespace=default kubectl get all For the kube-public namespace, execute the commands: kubectl config set-context --current --namespace=kube-public kubectl get all For the kube-node-lease namespace, execute the commands: kubectl config set-context --current --namespace=kube-node-lease kubectl get all The only return values are the Kubernetes service objects (e.g., service/kubernetes). For the kube-system namespace, execute the commands: kubectl config set-context --current --namespace=kube-system kubectl get all The values returned include the following resources: - ETCD - Helm - Kubernetes API Server - Kubernetes Controller Manager - Kubernetes Proxy - Kubernetes Scheduler - Kubernetes Networking Components - Ingress Controller Components - Metrics Server If a return value from the "kubectl get all" command is not the Kubernetes service, one from the above lists, or a service otherwise approved by your Information Systems Security Officer (ISSO), this is a finding.

ℹ️ Check

System namespaces are reserved and isolated. To view the available namespaces, run the command: kubectl get namespaces The namespaces to be validated include: default kube-public kube-system kube-node-lease For the default namespace, execute the commands: kubectl config set-context --current --namespace=default kubectl get all For the kube-public namespace, execute the commands: kubectl config set-context --current --namespace=kube-public kubectl get all For the kube-node-lease namespace, execute the commands: kubectl config set-context --current --namespace=kube-node-lease kubectl get all The only return values are the Kubernetes service objects (e.g., service/kubernetes). For the kube-system namespace, execute the commands: kubectl config set-context --current --namespace=kube-system kubectl get all The values returned include the following resources: - ETCD - Helm - Kubernetes API Server - Kubernetes Controller Manager - Kubernetes Proxy - Kubernetes Scheduler - Kubernetes Networking Components - Ingress Controller Components - Metrics Server If a return value from the "kubectl get all" command is not the Kubernetes service, one from the above lists, or a service otherwise approved by your Information Systems Security Officer (ISSO), this is a finding.

✔️ Fix
System namespaces are reserved and isolated. A resource cannot move to a new namespace; the resource must be deleted and recreated in the new namespace. kubectl delete <resource_type> <resource_name> kubectl create -f <resource.yaml> --namespace=<user_created_namespace>