Cis Ocp V170 5.7.3

CIS Red Hat OpenShift Container Platform Benchmark v1.7.0 - Control 5.7.3

Profile Applicability

• Level: 2

Description

Apply Security Context to Your Pods and Containers.

Rationale

A security context defines the operating system security settings (uid, gid, capabilities, SELinux role, etc..) applied to a container. When designing your containers and pods, make sure that you configure the security context for your pods, containers, and volumes. A security context is a property defined in the deployment yaml. It controls the security parameters that will be assigned to the pod/container/volume. There are two levels of security context: pod level security context, and container level security context.

Impact

If you incorrectly apply security contexts, you may have trouble running the pods.

Audit Procedure

Review the pod definitions in your cluster and verify that you have security contexts defined as appropriate.

OpenShift's Security Context Constraint feature is on by default in OpenShift 4 and applied to all pods deployed. SCC selection is determined by a combination of the values in the securityContext and the rolebindings for the account deploying the pod.

Run the following command to obtain a list of pods that are using privileged security context constraints:

oc get pods -A -o json | jq '.items[] |
select(.metadata.annotations."openshift.io/scc"|test("privileged"?)) |
.metadata.name'

Review each pod to ensure it requires the use of privileged security context constraints, which is the most relaxed security context constraint available in OpenShift by default.

Run the following command to obtain a list of pods that are not using security context constraints at all:

oc get pods -A -o json | jq '.items[] |
select(.metadata.annotations."openshift.io/scc" == null) | .metadata.name'

Review each pod and determine if there is an existing security context constraint that it should be using.

Remediation

Follow the Kubernetes documentation and apply security contexts to your pods. For a suggested list of security contexts, you may refer to the CIS Security Benchmark for Docker Containers.

Default Value

By default, no security contexts are automatically applied to pods.

References

1. https://kubernetes.io/docs/concepts/policy/security-context/
2. https://learn.cisecurity.org/benchmarks

CIS Controls

MITRE ATT&CK Mappings

Profile

Level 2 (Manual)