kube-bench/cfg/cis-1.5/policies.yaml

---
controls:
version: 1.5
id: 5
text: "Kubernetes Policies"
type: "policies"
groups:
- id: 5.1
  text: "RBAC and Service Accounts"
  checks:
  - id: 5.1.1
    text: "Ensure that the cluster-admin role is only used where required (Not Scored)"
    type: "manual"
    remediation: |
      Identify all clusterrolebindings to the cluster-admin role. Check if they are used and
      if they need this role or if they could use a role with fewer privileges. 
      Where possible, first bind users to a lower privileged role and then remove the
      clusterrolebinding to the cluster-admin role : 
      kubectl delete clusterrolebinding [name]         
    scored: false

  - id: 5.1.2
    text: "Minimize access to secrets (Not Scored)"
    type: "manual"
    remediation: |
      Where possible, remove get, list and watch access to secret objects in the cluster.       
    scored: false

  - id: 5.1.3
    text: "Minimize wildcard use in Roles and ClusterRoles (Not Scored)"
    type: "manual"
    remediation: |
      Where possible replace any use of wildcards in clusterroles and roles with specific
      objects or actions.      
    scored: false
    
  - id: 5.1.4
    text: "Minimize access to create pods (Not Scored)"
    type: "manual"
    Remediation: |
      Where possible, remove create access to pod objects in the cluster.       
    scored: false

  - id: 5.1.5
    text: "Ensure that default service accounts are not actively used. (Scored)"
    type: "manual"
    remediation: |
      Create explicit service accounts wherever a Kubernetes workload requires specific access
      to the Kubernetes API server. 
      Modify the configuration of each default service account to include this value
      automountServiceAccountToken: false       
    scored: true

  - id: 5.1.6
    text: "Ensure that Service Account Tokens are only mounted where necessary (Not Scored)"
    type: "manual"
    remediation: |
      Modify the definition of pods and service accounts which do not need to mount service
      account tokens to disable it.       
    scored: false

- id: 5.2
  text: "Pod Security Policies"
  checks:
  - id: 5.2.1
    text: "Minimize the admission of privileged containers (Not Scored)"
    type: "manual"
    remediation: |
      Create a PSP as described in the Kubernetes documentation, ensuring that
      the .spec.privileged field is omitted or set to false.       
    scored: false

  - id: 5.2.2
    text: "Minimize the admission of containers wishing to share the host process ID namespace (Scored)"
    type: "manual"
    remediation: |
      Create a PSP as described in the Kubernetes documentation, ensuring that the 
      .spec.hostPID field is omitted or set to false.       
    scored: true

  - id: 5.2.3
    text: "Minimize the admission of containers wishing to share the host IPC namespace (Scored)"
    type: "manual"
    remediation: |
      Create a PSP as described in the Kubernetes documentation, ensuring that the 
      .spec.hostIPC field is omitted or set to false.       
    scored: true

  - id: 5.2.4
    text: "Minimize the admission of containers wishing to share the host network namespace (Scored)"
    type: "manual"
    remediation: |
      Create a PSP as described in the Kubernetes documentation, ensuring that the 
      .spec.hostNetwork field is omitted or set to false.       
    scored: true

  - id: 5.2.5
    text: "Minimize the admission of containers with allowPrivilegeEscalation (Scored)"
    type: "manual"
    remediation: |
      Create a PSP as described in the Kubernetes documentation, ensuring that the 
      .spec.allowPrivilegeEscalation field is omitted or set to false.      
    scored: true

  - id: 5.2.6
    text: "Minimize the admission of root containers (Not Scored)"
    type: "manual"
    remediation: |
      Create a PSP as described in the Kubernetes documentation, ensuring that the 
      .spec.runAsUser.rule is set to either MustRunAsNonRoot or MustRunAs with the range of 
      UIDs not including 0.      
    scored: false

  - id: 5.2.7
    text: "Minimize the admission of containers with the NET_RAW capability (Not Scored)"
    type: "manual"
    remediation: |
      Create a PSP as described in the Kubernetes documentation, ensuring that the 
      .spec.requiredDropCapabilities is set to include either NET_RAW or ALL.      
    scored: false

  - id: 5.2.8
    text: "Minimize the admission of containers with added capabilities (Not Scored)"
    type: "manual"
    remediation: |
      Ensure that allowedCapabilities is not present in PSPs for the cluster unless 
      it is set to an empty array.       
    scored: false

  - id: 5.2.9
    text: "Minimize the admission of containers with capabilities assigned (Not Scored) "
    type: "manual"
    remediation: |
      Review the use of capabilites in applications runnning on your cluster. Where a namespace
      contains applicaions which do not require any Linux capabities to operate consider adding 
      a PSP which forbids the admission of containers which do not drop all capabilities.       
    scored: false

- id: 5.3
  text: "Network Policies and CNI"
  checks:
  - id: 5.3.1
    text: "Ensure that the CNI in use supports Network Policies (Not Scored)"
    type: "manual"
    remediation: |
      If the CNI plugin in use does not support network policies, consideration should be given to
      making use of a different plugin, or finding an alternate mechanism for restricting traffic
      in the Kubernetes cluster.       
    scored: false

  - id: 5.3.2
    text: "Ensure that all Namespaces have Network Policies defined (Scored)"
    type: "manual"
    remediation: |
      Follow the documentation and create NetworkPolicy objects as you need them.       
    scored: true

- id: 5.4
  text: "Secrets Management"
  checks:
  - id: 5.4.1
    text: "Prefer using secrets as files over secrets as environment variables (Not Scored)"
    type: "manual"
    remediation: |
      if possible, rewrite application code to read secrets from mounted secret files, rather than
      from environment variables.       
    scored: false

  - id: 5.4.2
    text: "Consider external secret storage (Not Scored)"
    type: "manual"
    remediation: |
      Refer to the secrets management options offered by your cloud provider or a third-party
      secrets management solution.       
    scored: false

- id: 5.5
  text: "Extensible Admission Control"
  checks:
  - id: 5.5.1
    text: "Configure Image Provenance using ImagePolicyWebhook admission controller (Not Scored)"
    type: "manual"
    remediation: |
      Follow the Kubernetes documentation and setup image provenance.       
    scored: false

- id: 5.6
  text: "General Policies"
  checks:
  - id: 5.6.1
    text: "Create administrative boundaries between resources using namespaces (Not Scored)"
    type: "manual"
    remediation: |
      Follow the documentation and create namespaces for objects in your deployment as you need
      them.       
    scored: false

  - id: 5.6.2
    text: "Ensure that the seccomp profile is set to docker/default in your pod definitions (Not Scored)"
    type: "manual"
    remediation: |
      Seccomp is an alpha feature currently. By default, all alpha features are disabled. So, you
      would need to enable alpha features in the apiserver by passing "--feature-
      gates=AllAlpha=true" argument. 
      Edit the /etc/kubernetes/apiserver file on the master node and set the KUBE_API_ARGS
      parameter to "--feature-gates=AllAlpha=true" 
      KUBE_API_ARGS="--feature-gates=AllAlpha=true" 
      Based on your system, restart the kube-apiserver service. For example: 
      systemctl restart kube-apiserver.service 
      Use annotations to enable the docker/default seccomp profile in your pod definitions. An
      example is as below: 
      apiVersion: v1 
      kind: Pod 
      metadata: 
        name: trustworthy-pod   
        annotations:   
          seccomp.security.alpha.kubernetes.io/pod: docker/default 
      spec: 
        containers:   
          - name: trustworthy-container       
            image: sotrustworthy:latest       
    scored: false

  - id: 5.6.3
    text: "Apply Security Context to Your Pods and Containers (Not Scored)"
    type: "manual"
    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.       
    scored: false

  - id: 5.6.4
    text: "The default namespace should not be used (Scored)"
    type: "manual"
    remediation: |
      Ensure that namespaces are created to allow for appropriate segregation of Kubernetes
      resources and that all new resources are created in a specific namespace.       
    scored: true