cyberstrikeus 1.2.14 Ensure that the admission control plugin NodeRestriction is set (Automated)
Profile Applicability
- Level 2 - Master Node
Description
Limit the Node and Pod objects that a kubelet could modify.
Rationale
Using the NodeRestriction plug-in ensures that the kubelet is restricted to the Node and Pod objects that it could modify as defined. Such kubelets will only be allowed to modify their own Node API object, and only modify Pod API objects that are bound to their node.
Impact
None
Audit
Run the following command on the Control Plane node:
ps -ef | grep kube-apiserver
Verify that the --enable-admission-plugins argument is set to a value that includes NodeRestriction.
Remediation
Follow the Kubernetes documentation and configure NodeRestriction plug-in on kubelets. Then, edit the API server pod specification file /etc/kubernetes/manifests/kube-apiserver.yaml on the master node and set the --enable-admission-plugins parameter to a value that includes NodeRestriction.
--enable-admission-plugins=...,NodeRestriction,...
Default Value
By default, NodeRestriction is not set.
References
- https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/
- https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#noderestriction
- https://kubernetes.io/docs/reference/access-authn-authz/node/
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 13.10 Perform Application Layer Filtering | * | ||
| v7 | 12.9 Deploy Application Layer Filtering Proxy Server | * |