Cis Ocp V190 1.1.11

CIS Red Hat OpenShift Container Platform Benchmark v1.9.0 - Control 1.1.11

Profile Applicability

• Level: 1

Description

Ensure that the etcd data directory has permissions of 700 or more restrictive.

Rationale

etcd is a highly-available key-value store used by Kubernetes deployments for persistent storage of all of its REST API objects. This data directory should be protected from any unauthorized reads or writes. It should not be readable or writable by any group members or the world.

Impact

None

Audit Procedure

In OpenShift 4, etcd members are deployed on the master nodes as static pods. The pod specification file is created on control plane nodes at /etc/kubernetes/manifests/etcd-member.yaml. The etcd database is stored on the container host in /var/lib/etcd and mounted to the etcd-member container via the host path mount data-dir with the same filesystem path (/var/lib/etcd). The permissions for this directory on the container host is 700.

Starting with OCP 4.4, etcd is managed by the cluster-etcd-operator. The etcd operator will help to automate restoration of master nodes. There is also a new etcdctl container in the etcd static pod for quick debugging. cluster-admin rights are required to exec into etcd containers.

Run the following commands.

for i in $(oc get pods -n openshift-etcd -l app=etcd -oname); do oc exec -n openshift-etcd -c etcd $i -- stat -c %a%n /var/lib/etcd/member; done

Verify that the permissions are 700.

Remediation

No remediation required. File permissions are managed by the etcd operator.

Default Value

By default, etcd data directory has permissions of 700.

References

1. https://docs.openshift.com/container-platform/4.3/architecture/control-plane.html#defining-masters_control-plane
2. https://etcd.io/#data-dir
3. https://kubernetes.io/docs/tasks/administer-cluster/configure-upgrade-etcd/

CIS Controls

MITRE ATT&CK Mappings

Profile

Level 1 (Manual)