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copyright lastupdated keywords subcollection
years
2022, 2024
2024-06-10
openshift, benchmarks, 4.10
openshift

{{site.data.keyword.attribute-definition-list}}

4.10 CIS Kubernetes Benchmark

{: #cis-benchmark-410}

This version is no longer supported. Update your cluster to a supported version as soon as possible. {: important}

The Center for Internet Security (CIS) publishes the CIS Kubernetes Benchmark{: external} as a framework of specific steps to configure Kubernetes more securely and with standards that are commensurate to various industry regulations. This document contains the results of the version 1.5 CIS Kubernetes benchmark for clusters that run {{site.data.keyword.openshiftlong_notm}} version 4.10. For more information or help understanding the benchmark, see Using the benchmark. {: shortdesc}

1 Master node security configuration

{: #cis-benchmark-1-410}

Review the Master node security configuration results of the version 1.5 CIS Kubernetes benchmark. {: shortdesc}

1.1 Master node configuration files

{: #cis-benchmark-11-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
1.1.1 Ensure that the API server pod specification file permissions are set to 644 or more restrictive Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.2 Ensure that the API server pod specification file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.3 Ensure that the controller manager pod specification file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.4 Ensure that the controller manager pod specification file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.5 Ensure that the scheduler pod specification file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.6 Ensure that the scheduler pod specification file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.7 Ensure that the etcd pod specification file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.8 Ensure that the etcd pod specification file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.9 Ensure that the Container Network Interface file permissions are set to 644 or more restrictive. Not Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.10 Ensure that the Container Network Interface file ownership is set to root:root. Not Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.11 Ensure that the etcd data directory permissions are set to 700 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.12 Ensure that the etcd data directory ownership is set to etcd:etcd. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.13 Ensure that the admin.conf file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.14 Ensure that the admin.conf file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.15 Ensure that the scheduler.conf file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.16 Ensure that the scheduler.conf file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.17 Ensure that the controller-manager.conf file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.18 Ensure that the controller-manager.conf file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.19 Ensure that the Kubernetes PKI directory and file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.20 Ensure that the Kubernetes PKI certificate file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.1.21 Ensure that the Kubernetes PKI key file permissions are set to 600. Scored 1 Pass {{site.data.keyword.IBM_notm}}
{: caption="Section 1.1 Master node benchmark results" caption-side="bottom"}

1.2 API server

{: #cis-benchmark-12-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
1.2.1 Ensure that the --anonymous-auth option is set to false. Not Scored 1 Fail {{site.data.keyword.IBM_notm}}
1.2.2 Ensure that the --basic-auth-file option is not set. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.3 Ensure that the --token-auth-file parameter is not set. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.4 Ensure that the --kubelet-https option is set to true. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.5 Ensure that the --kubelet-client-certificate` and `--kubelet-client-key options are set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.6 Ensure that the --kubelet-certificate-authority option is set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.7 Ensure that the --authorization-mode option is not set to AlwaysAllow. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.8 Ensure that the --authorization-mode option includes Node. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.9 Ensure that the --authorization-mode option includes RBAC. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.10 Ensure that the admission control plug-in EventRateLimit is set. Not Scored 1 Fail {{site.data.keyword.IBM_notm}}
1.2.11 Ensure that the admission control plug-in AlwaysAdmit is not set. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.12 Ensure that the admission control plug-in AlwaysPullImages is set. Not Scored 1 Fail {{site.data.keyword.IBM_notm}}
1.2.13 Ensure that the admission control plug-in SecurityContextDeny is set if PodSecurityPolicy is not used. Not Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.14 Ensure that the admission control plug-in ServiceAccount is set. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.15 Ensure that the admission control plug-in NamespaceLifecycle is set. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.16 Ensure that the admission control plug-in PodSecurityPolicy is set. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.17 Ensure that the admission control plug-in NodeRestriction is set. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.18 Ensure that the --insecure-bind-address option is not set. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.19 Ensure that the --insecure-port option is set to 0. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.20 Ensure that the --secure-port option is not set to 0. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.21 Ensure that the --profiling option is set to false. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.22 Ensure that the --audit-log-path option is set. Scored 1 Fail Shared
1.2.23 Ensure that the --audit-log-maxage option is set to 30 or as appropriate. Scored 1 Fail Shared
1.2.24 Ensure that the --audit-log-maxbackup option is set to 10 or as appropriate. Scored 1 Fail Shared
1.2.25 Ensure that the --audit-log-maxsize option is set to 100 or as appropriate Scored 1 Fail Shared
1.2.26 Ensure that the --request-timeout option is set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.27 Ensure that the --service-account-lookup option is set to true. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.28 Ensure that the --service-account-key-file option is set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.29 Ensure that the --etcd-certfile and --etcd-keyfile options are set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.30 Ensure that the --tls-cert-file and --tls-private-key-file options are set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.31 Ensure that the --client-ca-file option is set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.32 Ensure that the --etcd-cafile option is set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.2.33 Ensure that the --encryption-provider-config option is set as appropriate. Scored 1 Fail Shared
1.2.34 Ensure that encryption providers are appropriately configured. Scored 1 Fail Shared
1.2.35 Ensure that the API Server makes use of only Strong Cryptographic Ciphers. Not Scored 1 Pass IBM
{: caption="Section 1.2 API server benchmark results" caption-side="bottom"}

1.3 Controller manager

{: #cis-benchmark-13-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
1.3.1 Ensure that the --terminated-pod-gc-threshold option is set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.3.2 Ensure that the --profiling option is set to false. Scored 1 Pass IBM
1.3.3 Ensure that the --use-service-account-credentials option is set to true. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.3.4 Ensure that the --service-account-private-key-file option is set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.3.5 Ensure that the --root-ca-file option is set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.3.6 Ensure that the RotateKubeletServerCertificate option is set to true. Scored 2 Pass {{site.data.keyword.IBM_notm}}
1.3.7 Ensure that the --bind-address option is set to 127.0.0.1. Scored 1 Pass {{site.data.keyword.IBM_notm}}
{: caption="Section 1.3 Controller manager benchmark results" caption-side="bottom"}

1.4 Scheduler

{: #cis-benchmark-14-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
1.4.1 Ensure that the --profiling option is set to false. Scored 1 Pass {{site.data.keyword.IBM_notm}}
1.4.2 Ensure that the --bind-address option is set to 127.0.0.1 Scored 1 Pass {{site.data.keyword.IBM_notm}}
{: caption="Section 1.4 Scheduler benchmark results" caption-side="bottom"}

2 Etcd node configuration

{: #cis-section-2-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
2.1 Ensure that the --cert-file and --key-file options are set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
2.2 Ensure that the --client-cert-auth option is set to true. Scored 1 Pass {{site.data.keyword.IBM_notm}}
2.3 Ensure that the --auto-tls option is not set to true. Scored 1 Pass IBM
2.4 Ensure that the --peer-cert-file and --peer-key-file options are set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
2.5 Ensure that the --peer-client-cert-auth option is set to true. Scored 1 Pass {{site.data.keyword.IBM_notm}}
2.6 Ensure that the --peer-auto-tls option is not set to true. Scored 1 Pass {{site.data.keyword.IBM_notm}}
2.7 Ensure that a unique Certificate Authority is used for etcd. Not Scored 2 Pass {{site.data.keyword.IBM_notm}}
{: caption="Section 2 Etcd Node Configuration benchmark results" caption-side="bottom"}

3 Control plane configuration

{: #cis-section-3-410}

3.1 Authentication and authorization

{: #cis-benchmark-31-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
3.1.1 Client certificate authentication should not be used for users. Not Scored 2 Pass Shared
{: caption="Section 3.1 Authentication and Authorization benchmark results" caption-side="bottom"}

3.2 Logging

{: #cis-benchmark-32-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
3.2.1 Ensure that a minimal audit policy is created. Scored 1 Fail Shared
3.2.2 Ensure that the audit policy covers key security concerns. Not Scored 2 Fail Shared
{: caption="Section 3.2 Logging benchmark results" caption-side="bottom"}

4 Worker node security configuration

{: #cis-section-4-410}

Review the Worker Node Security Configuration results of the version 1.5 CIS Kubernetes benchmark. {: shortdesc}

4.1 Worker node configuration files

{: #cis-benchmark-41-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
4.1.1 Ensure that the kubelet service file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.1.2 Ensure that the kubelet service file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.1.3 Ensure that the proxy kubeconfig file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.1.4 Ensure that the proxy kubeconfig file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.1.5 Ensure that the kubelet.conf file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.1.6 Ensure that the kubelet.conf file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.1.7 Ensure that the certificate authorities file permissions are set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.1.8 Ensure that the client certificate authorities file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.1.9 Ensure that the kubelet configuration file has permissions set to 644 or more restrictive. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.1.10 Ensure that the kubelet configuration file ownership is set to root:root. Scored 1 Pass {{site.data.keyword.IBM_notm}}
{: caption="Section 4.1 Worker Node Configuration benchmark results" caption-side="bottom"}

4.2 Kubelet

{: #cis-benchmark-42-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
4.2.1 Ensure that the --anonymous-auth option is set to false. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.2.2 Ensure that the --authorization-mode option is not set to AlwaysAllow. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.2.3 Ensure that the --client-ca-file option is set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.2.4 Ensure that the --read-only-port option is set to 0. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.2.5 Ensure that the --streaming-connection-idle-timeout option is not set to 0. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.2.6 Ensure that the --protect-kernel-defaults option is set to true. Scored 1 Fail {{site.data.keyword.IBM_notm}}
4.2.7 Ensure that the --make-iptables-util-chains option is set to true. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.2.8 Ensure that the --hostname-override option is not set. Not Scored 1 Fail {{site.data.keyword.IBM_notm}}
4.2.9 Ensure that the --event-qps option is set to 0 or a level which ensures appropriate event capture. Not Scored 2 Pass {{site.data.keyword.IBM_notm}}
4.2.10 Ensure that the --tls-cert-file and --tls-private-key-file options are set as appropriate. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.2.11 Ensure that the --rotate-certificates option is not set to false. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.2.12 Ensure that the RotateKubeletServerCertificateoption is set to true. Scored 1 Pass {{site.data.keyword.IBM_notm}}
4.2.13 Ensure that the kubelet makes use of only Strong Cryptographic Ciphers Not Scored 1 Pass {{site.data.keyword.IBM_notm}}
{: caption="Section 4.2 Kubelet benchmark results" caption-side="bottom"}

5 Kubernetes policies

{: #cis-section-5-410}

Review the Kubernetes Policies results of the version 1.5 CIS Kubernetes benchmark. {: shortdesc}

5.1 RBAC and service accounts

{: #cis-benchmark-51-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
5.1.1 Ensure that the cluster-admin role is only used where required. Not Scored 1 Pass Shared
5.1.2 Minimize access to secrets. Not Scored 1 Fail Shared
5.1.3 Minimize wildcard use in Roles and ClusterRoles. Not Scored 1 Fail Shared
5.1.4 Minimize access to create pods. Not Scored 1 Pass Shared
5.1.5 Ensure that default service accounts are not actively used. Scored 1 Fail Shared
5.1.6 Ensure that Service Account Tokens are only mounted where necessary. Not Scored 1 Fail Shared
{: caption="Section 5.1 RBAC and Service Accounts benchmark results" caption-side="bottom"}

5.2 Pod Security Policies

{: #cis-benchmark-52-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
5.2.1 Minimize the admission of privileged containers. Not Scored 1 Pass Shared
5.2.2 Minimize the admission of containers wanting to share the host process ID namespace. Scored 1 Pass Shared
5.2.3 Minimize the admission of containers wanting to share the host IPC namespace. Scored 1 Pass Shared
5.2.4 Minimize the admission of containers wanting to share the host network namespace. Scored 1 Pass Shared
5.2.5 Minimize the admission of containers with allowPrivilegeEscalation. Scored 1 Pass Shared
5.2.6 Minimize the admission of root containers. Not Scored 2 Pass Shared
5.2.7 Minimize the admission of containers with the NET_RAW capability. Not Scored 1 Pass Shared
5.2.8 Minimize the admission of containers with added capabilities. Not Scored 1 Pass Shared
5.2.9 Minimize the admission of containers with capabilities assigned. Not Scored 2 Pass Shared
{: caption="Section 5.2 Pod Security Policies benchmark results" caption-side="bottom"}

5.3 Network policies and CNI

{: #cis-benchmark-53-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
5.3.1 Ensure that the CNI in use supports network policies. Not Scored 1 Pass {{site.data.keyword.IBM_notm}}
5.3.2 Ensure that all namespaces have network policies defined. Scored 2 Fail Shared
{: caption="Section 5.3 Network policies and CNI benchmark results" caption-side="bottom"}

5.4 Secrets management

{: #cis-benchmark-54-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
5.4.1 Prefer using secrets as files over secrets as environment variables. Not Scored 1 Fail Shared
5.4.2 Consider external secret storage Not Scored 2 Fail Shared
{: caption="Section 5.4 Secrets management benchmark results" caption-side="bottom"}

5.5 Extensible admission control

{: #cis-benchmark-55-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
5.5.1 Configure Image Provenance using ImagePolicyWebhook admission controller. Not Scored 2 Fail Shared
{: caption="Section 5.5 Extensible admission control benchmark results" caption-side="bottom"}

5.6 General policies

{: #cis-benchmark-56-410}

Section Recommendation Scored/Not Scored Level Result Responsibility
5.6.1 Create administrative boundaries between resources using namespaces. Not Scored 1 Pass Shared
5.6.2 Ensure that the seccomp profile is set to docker/default in your pod definitions. Not Scored 2 Fail Shared
5.6.3 Apply security context to your pods and containers. Not Scored 2 Fail Shared
5.6.4 The default namespace should not be used. Scored 2 Pass Shared
{: caption="Section 5.6 General policies benchmark results" caption-side="bottom"}

{{site.data.keyword.IBM_notm}} remediations and explanations

{: #ibm-remediations-and-explanations-410}

Section Remediation/Explanation
1.2.1 {{site.data.keyword.openshiftlong_notm}} utilizes RBAC for cluster protection, but allows anonymous discovery, which is considered reasonable per CIS Kubernetes Benchmark.
1.2.10 {{site.data.keyword.openshiftlong_notm}} does not enable the EventRateLimit admission controller since it is a Kubernetes alpha feature.
1.2.12 {{site.data.keyword.openshiftlong_notm}} does not enable the AlwaysPullImages admission controller since it overrides a container's imagePullPolicy and may impact performance.
1.2.13 {{site.data.keyword.openshiftlong_notm}} supports pod security context constraints which are similar to Kubernetes pod security policies.
1.2.16 {{site.data.keyword.openshiftlong_notm}} supports pod security context constraints which are similar to Kubernetes pod security policies.
1.2.22 {{site.data.keyword.openshiftlong_notm}} can optionally enable Kubernetes API server auditing.
1.2.23 {{site.data.keyword.openshiftlong_notm}} can optionally enable Kubernetes API server auditing.
1.2.24 {{site.data.keyword.openshiftlong_notm}} can optionally enable Kubernetes API server auditing.
1.2.25 {{site.data.keyword.openshiftlong_notm}} can optionally enable Kubernetes API server auditing.
1.2.33 {{site.data.keyword.openshiftlong_notm}} can optionally enable a Kubernetes Key Management Service (KMS) provider.
1.2.34 {{site.data.keyword.openshiftlong_notm}} can optionally enable a Kubernetes Key Management Service (KMS) provider.
3.2.1 {{site.data.keyword.openshiftlong_notm}} can optionally enable Kubernetes API server auditing.
3.2.2 {{site.data.keyword.openshiftlong_notm}} can optionally enable Kubernetes API server auditing.
4.2.6 {{site.data.keyword.openshiftlong_notm}} does not protect kernel defaults to allow customers to tune kernel parameters.
4.2.8 {{site.data.keyword.openshiftlong_notm}} ensures that the hostname matches the name issued by the infrastructure.
5.1.2 {{site.data.keyword.openshiftlong_notm}} deploys some system components that could have their Kubernetes secret access further restricted.
5.1.3 {{site.data.keyword.openshiftlong_notm}} deploys some system components that could have their Kubernetes resource access further restricted.
5.1.5 {{site.data.keyword.openshiftlong_notm}} does not set automountServiceAccountToken: false for each default service account.
5.1.6 {{site.data.keyword.openshiftlong_notm}} deploys some system components that could set automountServiceAccountToken: false.
5.2.1 {{site.data.keyword.openshiftlong_notm}} can optionally configure security context constraints.
5.2.2 {{site.data.keyword.openshiftlong_notm}} can optionally configure security context constraints.
5.2.3 {{site.data.keyword.openshiftlong_notm}} can optionally configure security context constraints.
5.2.4 {{site.data.keyword.openshiftlong_notm}} can optionally configure security context constraints.
5.2.5 {{site.data.keyword.openshiftlong_notm}} can optionally configure security context constraints.
5.2.6 {{site.data.keyword.openshiftlong_notm}} can optionally configure security context constraints.
5.2.7 {{site.data.keyword.openshiftlong_notm}} can optionally configure security context constraints.
5.2.8 {{site.data.keyword.openshiftlong_notm}} can optionally configure security context constraints.
5.2.9 {{site.data.keyword.openshiftlong_notm}} can optionally configure security context constraints.
5.3.2 {{site.data.keyword.openshiftlong_notm}} has a set of default Calico network policies defined and additional network policies can optionally be added.
5.4.1 {{site.data.keyword.openshiftlong_notm}} deploys some system components that could prefer using secrets as files over secrets as environment variables.
5.4.2 {{site.data.keyword.openshiftlong_notm}} can optionally enable a Kubernetes Key Management Service (KMS) provider.
5.5.1 {{site.data.keyword.openshiftlong_notm}} can optionally enable image security enforcement.
5.6.2 {{site.data.keyword.openshiftlong_notm}} does not annotate all pods with seccomp profiles{: external}.
5.6.3 {{site.data.keyword.openshiftlong_notm}} deploys some system components that do not set a pod or container securityContext{: external}.
{: caption="Explanation and remediation" caption-side="bottom"}