| name | cis-k8s-v1120-4.2.1 |
| description | Ensure that the --anonymous-auth argument is set to false (Automated) |
| category | cis-k8s |
| version | 1.12.0 |
| author | cyberstrike-official |
| tags | ["cis","kubernetes","worker-nodes","kubelet"] |
| cis_id | 4.2.1 |
| cis_benchmark | CIS Kubernetes Benchmark v1.12.0 |
| tech_stack | ["kubernetes"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
CIS Kubernetes Benchmark v1.12.0 - Control 4.2.1
Description
Disable anonymous requests to the Kubelet server.
Rationale
When enabled, requests that are not rejected by other configured authentication methods are treated as anonymous requests. These requests are then served by the Kubelet server. You should rely on authentication to authorize access and disallow anonymous requests.
Impact
Anonymous requests will be rejected.
Audit Procedure
Step 1: Check kubelet configuration file
If using a Kubelet configuration file, check that there is an entry for authentication: anonymous: enabled set to false.
Step 2: Verify via process arguments
Run the following command on each node:
ps -ef | grep kubelet
Verify that the --anonymous-auth argument is set to false.
This executable argument may be omitted, provided there is a corresponding entry set to false in the Kubelet config file.
Remediation
If using a Kubelet config file, edit the file to set authentication: anonymous: enabled to false.
If using executable arguments, edit the kubelet service file /etc/kubernetes/kubelet.conf on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
--anonymous-auth=false
Based on your system, restart the kubelet service. For example:
systemctl daemon-reload
systemctl restart kubelet.service
Default Value
By default, anonymous access is enabled.
References
- https://kubernetes.io/docs/admin/kubelet/
- https://kubernetes.io/docs/admin/kubelet-authentication-authorization/#kubelet-authentication
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|
| v8 | 3.3 Configure Data Access Control Lists
Configure data access control lists based on a user's need to know. Apply data access control lists, also known as access permissions, to local and remote file systems, databases, and applications. |
