基于 SOC 职业分类
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macOS post-exploitation for credential harvesting, DTrace monitoring, TCC bypass, and stealth operations via native tools
Windows userland post-exploitation for credential harvesting, monitoring, AMSI/ETW bypass, and stealth operations
Kubernetes post-exploitation for container escape, secret extraction, RBAC abuse, and cluster persistence
| name | cis-gke-v180-3.1.3 |
| description | Ensure that the kubelet configuration file has permissions set to 644 (Automated) |
| category | cis-gke |
| version | 1.8.0 |
| author | cyberstrike-official |
| tags | ["cis","gke","kubernetes","gcp","worker-nodes","configuration-files","permissions","kubelet","kubelet-config"] |
| cis_id | 3.1.3 |
| cis_benchmark | CIS Google Kubernetes Engine (GKE) Benchmark v1.8.0 |
| tech_stack | ["kubernetes","gcp","gke"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Ensure that if the kubelet configuration file exists, it has permissions of 644.
The kubelet reads various parameters, including security settings, from a config file specified by the --config argument. If this file exists, you should restrict its file permissions to maintain the integrity of the file. The file should be writable by only the administrators on the system.
Overly permissive file access increases the security risk to the platform.
Method 1
First, SSH to the relevant worker node. To check to see if the kubelet service is running:
sudo systemctl status kubelet
The output should return Active: active (running) since...
Run the following command on each node to find the appropriate Kubelet config file:
ps -ef | grep kubelet
The output of the above command should return something similar to --config /etc/kubernetes/kubelet-config.yaml which is the location of the Kubelet config file.
Run the following command:
stat -c %a /etc/kubernetes/kubelet-config.yaml
The output of the above command is the kubelet config file's permissions. Verify that the permissions are 644 or more restrictive.
Method 2
Create and Run a Privileged Pod.
You will need to run a pod that is privileged enough to access the host's file system. This can be achieved by deploying a pod that uses the hostPath volume to mount the node's file system into the pod.
Here's an example of a simple pod definition that mounts the root of the host to /host within the pod:
apiVersion: v1
kind: Pod
metadata:
name: file-check
spec:
volumes:
- name: host-root
hostPath:
path: /
type: Directory
containers:
- name: nsenter
image: busybox
command: ["sleep", "3600"]
volumeMounts:
- name: host-root
mountPath: /host
securityContext:
privileged: true
Save this to a file (e.g., file-check-pod.yaml) and create the pod:
kubectl apply -f file-check-pod.yaml
Once the pod is running, you can exec into it to check file permissions on the node:
kubectl exec -it file-check -- sh
Now you are in a shell inside the pod, but you can access the node's file system through the /host directory and check the permission level of the file:
ls -l /host/etc/kubernetes/kubelet-config.yaml
Verify that if a file is specified and it exists, the permissions are 644 or more restrictive.
Run the following command (using the kubelet config file location):
chmod 644 <kubelet_config_file>
The default permissions for the kubelet configuration file are 600.
| 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. | X | X | X |
| v7 | 5.2 Maintain Secure Images - Maintain secure images or templates for all systems in the enterprise based on the organization's approved configuration standards. Any new system deployment or existing system that becomes compromised should be imaged using one of those images or templates. | X | X |