Cluster Nodes & Masters Failing kube-bench Security Checks - Question

[cheynewallace]

I just ran kube-bench (https://github.com/aquasecurity/kube-bench) across my KOPS 1.10 provisioned clusters (Kubernetes 1.10.11 running kope.io/k8s-1.10-debian-jessie-amd64-hvm-ebs-2018-08-17) and I was quite shocked to see a large number of tests failed for both nodes and masters.

I expected a few, but not quite this many.

Is there any reason why there seems to be so many security issues with both node and master machines provisioned with KOPS?

Some output

Workers

[INFO] 2 Worker Node Security Configuration
[INFO] 2.1 Kubelet
[FAIL] 2.1.1 Ensure that the --allow-privileged argument is set to false (Scored)
[FAIL] 2.1.2 Ensure that the --anonymous-auth argument is set to false (Scored)
[FAIL] 2.1.3 Ensure that the --authorization-mode argument is not set to AlwaysAllow (Scored)
[FAIL] 2.1.4 Ensure that the --client-ca-file argument is set as appropriate (Scored)
[FAIL] 2.1.5 Ensure that the --read-only-port argument is set to 0 (Scored)
[FAIL] 2.1.6 Ensure that the --streaming-connection-idle-timeout argument is not set to 0 (Scored)
[FAIL] 2.1.7 Ensure that the --protect-kernel-defaults argument is set to true (Scored)
[PASS] 2.1.8 Ensure that the --make-iptables-util-chains argument is set to true (Scored)
[FAIL] 2.1.9 Ensure that the --hostname-override argument is not set (Scored)
[FAIL] 2.1.10 Ensure that the --event-qps argument is set to 0 (Scored)
[FAIL] 2.1.11 Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Scored)
[PASS] 2.1.12 Ensure that the --cadvisor-port argument is set to 0 (Scored)
[FAIL] 2.1.13 Ensure that the --rotate-certificates argument is not set to false (Scored)
[FAIL] 2.1.14 Ensure that the RotateKubeletServerCertificate argument is set to true (Scored)
[FAIL] 2.1.15 Ensure that the Kubelet only makes use of Strong Cryptographic Ciphers (Not Scored)
[INFO] 2.2 Configuration Files
[FAIL] 2.2.1 Ensure that the kubelet.conf file permissions are set to 644 or more restrictive (Scored)
[FAIL] 2.2.2 Ensure that the kubelet.conf file ownership is set to root:root (Scored)
[FAIL] 2.2.3 Ensure that the kubelet service file permissions are set to 644 or more restrictive (Scored)
[FAIL] 2.2.4 Ensure that the kubelet service file ownership is set to root:root (Scored)
[FAIL] 2.2.5 Ensure that the proxy kubeconfig file permissions are set to 644 or more restrictive (Scored)
[FAIL] 2.2.6 Ensure that the proxy kubeconfig file ownership is set to root:root (Scored)
[WARN] 2.2.7 Ensure that the certificate authorities file permissions are set to 644 or more restrictive (Scored)
[WARN] 2.2.8 Ensure that the client certificate authorities file ownership is set to root:root (Scored)
[FAIL] 2.2.9 Ensure that the kubelet configuration file ownership is set to root:root (Scored)
[FAIL] 2.2.10 Ensure that the kubelet configuration file has permissions set to 644 or more restrictive (Scored)

Masters

[INFO] 1 Master Node Security Configuration
[INFO] 1.1 API Server
[PASS] 1.1.1 Ensure that the --anonymous-auth argument is set to false (Scored)
[FAIL] 1.1.2 Ensure that the --basic-auth-file argument is not set (Scored)
[PASS] 1.1.3 Ensure that the --insecure-allow-any-token argument is not set (Scored)
[PASS] 1.1.4 Ensure that the --kubelet-https argument is set to true (Scored)
[FAIL] 1.1.5 Ensure that the --insecure-bind-address argument is not set (Scored)
[FAIL] 1.1.6 Ensure that the --insecure-port argument is set to 0 (Scored)
[PASS] 1.1.7 Ensure that the --secure-port argument is not set to 0 (Scored)
[FAIL] 1.1.8 Ensure that the --profiling argument is set to false (Scored)
[FAIL] 1.1.9 Ensure that the --repair-malformed-updates argument is set to false (Scored)
[PASS] 1.1.10 Ensure that the admission control plugin AlwaysAdmit is not set (Scored)
[FAIL] 1.1.11 Ensure that the admission control plugin AlwaysPullImages is set (Scored)
[FAIL] 1.1.12 Ensure that the admission control plugin DenyEscalatingExec is set (Scored)
[FAIL] 1.1.13 Ensure that the admission control plugin SecurityContextDeny is set (Scored)
[FAIL] 1.1.14 Ensure that the admission control plugin NamespaceLifecycle is set (Scored)
[FAIL] 1.1.15 Ensure that the --audit-log-path argument is set as appropriate (Scored)
[FAIL] 1.1.16 Ensure that the --audit-log-maxage argument is set to 30 or as appropriate (Scored)
[FAIL] 1.1.17 Ensure that the --audit-log-maxbackup argument is set to 10 or as appropriate (Scored)
[FAIL] 1.1.18 Ensure that the --audit-log-maxsize argument is set to 100 or as appropriate (Scored)
[PASS] 1.1.19 Ensure that the --authorization-mode argument is not set to AlwaysAllow (Scored)
[FAIL] 1.1.20 Ensure that the --token-auth-file parameter is not set (Scored)
[FAIL] 1.1.21 Ensure that the --kubelet-certificate-authority argument is set as appropriate (Scored)
[FAIL] 1.1.22 Ensure that the --kubelet-client-certificate and --kubelet-client-key arguments are set as appropriate (Scored)
[FAIL] 1.1.23 Ensure that the --service-account-lookup argument is set to true (Scored)
[FAIL] 1.1.24 Ensure that the admission control plugin PodSecurityPolicy is set (Scored)
[FAIL] 1.1.25 Ensure that the --service-account-key-file argument is set as appropriate (Scored)
[FAIL] 1.1.26 Ensure that the --etcd-certfile and --etcd-keyfile arguments are set as appropriate (Scored)
[PASS] 1.1.27 Ensure that the admission control plugin ServiceAccount is set(Scored)
[PASS] 1.1.28 Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Scored)
[PASS] 1.1.29 Ensure that the --client-ca-file argument is set as appropriate (Scored)
[FAIL] 1.1.30 Ensure that the API Server only makes use of Strong Cryptographic Ciphers (Not Scored)
[FAIL] 1.1.31 Ensure that the --etcd-cafile argument is set as appropriate (Scored)
[FAIL] 1.1.32 Ensure that the --authorization-mode argument is set to Node (Scored)
[PASS] 1.1.33 Ensure that the admission control plugin NodeRestriction is set (Scored)
[FAIL] 1.1.34 Ensure that the --experimental-encryption-provider-config argument is set as appropriate (Scored)
[WARN] 1.1.35 Ensure that the encryption provider is set to aescbc (Scored)
[FAIL] 1.1.36 Ensure that the admission control plugin EventRateLimit is set (Scored)
[PASS] 1.1.37 Ensure that the AdvancedAuditing argument is not set to false (Scored)
[PASS] 1.1.38 Ensure that the --request-timeout argument is set as appropriate (Scored)
[FAIL] 1.1.39 Ensure that the API Server only makes use of Strong Cryptographic Ciphers ( Not Scored)
[INFO] 1.2 Scheduler
[FAIL] 1.2.1 Ensure that the --profiling argument is set to false (Scored)
[PASS] 1.2.2 Ensure that the --address argument is set to 127.0.0.1 (Scored)
[INFO] 1.3 Controller Manager
[FAIL] 1.3.1 Ensure that the --terminated-pod-gc-threshold argument is set as appropriate (Scored)
[FAIL] 1.3.2 Ensure that the --profiling argument is set to false (Scored)
[PASS] 1.3.3 Ensure that the --use-service-account-credentials argument is set to true (Scored)
[PASS] 1.3.4 Ensure that the --service-account-private-key-file argument is set as appropriate (Scored)
[PASS] 1.3.5 Ensure that the --root-ca-file argument is set as appropriate (Scored)
[FAIL] 1.3.6 Ensure that the RotateKubeletServerCertificate argument is set to true (Scored)
[PASS] 1.3.7 Ensure that the --address argument is set to 127.0.0.1 (Scored)
[INFO] 1.4 Configuration Files
[FAIL] 1.4.1 Ensure that the API server pod specification file permissions are set to 644 or more restrictive (Scored)
[FAIL] 1.4.2 Ensure that the API server pod specification file ownership is set to root:root (Scored)
[FAIL] 1.4.3 Ensure that the controller manager pod specification file permissions are set to 644 or more restrictive (Scored)
[FAIL] 1.4.4 Ensure that the controller manager pod specification file ownership is set to root:root (Scored)
[FAIL] 1.4.5 Ensure that the scheduler pod specification file permissions are set to 644 or more restrictive (Scored)
[FAIL] 1.4.6 Ensure that the scheduler pod specification file ownership is set to root:root (Scored)
[FAIL] 1.4.7 Ensure that the etcd pod specification file permissions are set to 644 or more restrictive (Scored)
[FAIL] 1.4.8 Ensure that the etcd pod specification file ownership is set to root:root (Scored)
[WARN] 1.4.9 Ensure that the Container Network Interface file permissions are set to 644 or more restrictive (Not Scored)
[WARN] 1.4.10 Ensure that the Container Network Interface file ownership is set to root:root (Not Scored)
[FAIL] 1.4.11 Ensure that the etcd data directory permissions are set to 700 or more restrictive (Scored)
[FAIL] 1.4.12 Ensure that the etcd data directory ownership is set to etcd:etcd (Scored)
[FAIL] 1.4.13 Ensure that the admin.conf file permissions are set to 644 or more restrictive (Scored)
[FAIL] 1.4.14 Ensure that the admin.conf file ownership is set to root:root (Scored)
[FAIL] 1.4.15 Ensure that the scheduler.conf file permissions are set to 644 or more restrictive (Scored)
[FAIL] 1.4.16 Ensure that the scheduler.conf file ownership is set to root:root (Scored)
[FAIL] 1.4.17 Ensure that the controller-manager.conf file permissions are set to 644 or more restrictive (Scored)
[FAIL] 1.4.18 Ensure that the controller-manager.conf file ownership is set to root:root (Scored)
[INFO] 1.5 etcd
[FAIL] 1.5.1 Ensure that the --cert-file and --key-file arguments are set as appropriate (Scored)
[FAIL] 1.5.2 Ensure that the --client-cert-auth argument is set to true (Scored)
[PASS] 1.5.3 Ensure that the --auto-tls argument is not set to true (Scored)
[WARN] 1.5.4 Ensure that the --peer-cert-file and --peer-key-file arguments are set as appropriate (Scored)
[WARN] 1.5.5 Ensure that the --peer-client-cert-auth argument is set to true (Scored)
[WARN] 1.5.6 Ensure that the --peer-auto-tls argument is not set to true (Scored)
[WARN] 1.5.7 Ensure that a unique Certificate Authority is used for etcd (Not Scored)
[INFO] 1.6 General Security Primitives
[WARN] 1.6.1 Ensure that the cluster-admin role is only used where required (Not Scored)
[WARN] 1.6.2 Create administrative boundaries between resources using namespaces (Not Scored)
[WARN] 1.6.3 Create network segmentation using Network Policies (Not Scored)
[WARN] 1.6.4 Ensure that the seccomp profile is set to docker/default in your pod definitions (Not Scored)
[WARN] 1.6.5 Apply Security Context to Your Pods and Containers (Not Scored)
[WARN] 1.6.6 Configure Image Provenance using ImagePolicyWebhook admission controller (Not Scored)
[WARN] 1.6.7 Configure Network policies as appropriate (Not Scored)
[WARN] 1.6.8 Place compensating controls in the form of PSP and RBAC for privileged containers usage (Not Scored)
[INFO] 1.7 PodSecurityPolicies
[WARN] 1.7.1 Do not admit privileged containers (Not Scored)
[WARN] 1.7.2 Do not admit containers wishing to share the host process ID namespace (Not Scored)
[WARN] 1.7.3 Do not admit containers wishing to share the host IPC namespace (Not Scored)
[WARN] 1.7.4 Do not admit containers wishing to share the host network namespace (Not Scored)
[WARN] 1.7.5  Do not admit containers with allowPrivilegeEscalation (Not Scored)
[WARN] 1.7.6 Do not admit root containers (Not Scored)
[WARN] 1.7.7 Do not admit containers with dangerous capabilities (Not Scored)

UPDATED WITH FULL LIST AFTER VERSION 1.10.11 UPGRADE