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288 lines
12 KiB
288 lines
12 KiB
---
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controls:
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version: "eks-stig-kubernetes-v1r6"
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id: 3
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text: "Worker Node Security Configuration"
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type: "node"
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groups:
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- id: 3.1
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text: "DISA Category Code I"
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checks:
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- id: V-242387 # CIS 3.2.4
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text: "The Kubernetes Kubelet must have the read-only port flag disabled (Manual)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: "--read-only-port"
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path: '{.readOnlyPort}'
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set: true
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compare:
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op: eq
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value: 0
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remediation: |
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If using a Kubelet config file, edit $kubeletconf to set readOnlyPort to 0.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--read-only-port=0
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: false
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- id: V-242391 # CIS 3.2.1
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text: "The Kubernetes Kubelet must have anonymous authentication disabled (Automated)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: "--anonymous-auth"
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path: '{.authentication.anonymous.enabled}'
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set: true
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compare:
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op: eq
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value: false
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remediation: |
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If using a Kubelet config file, edit $kubeletconf to set authentication: anonymous: enabled to
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false.
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If using executable arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--anonymous-auth=false
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: V-242392 # CIS 3.2.2
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text: "The Kubernetes kubelet must enable explicit authorization (Automated)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --authorization-mode
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path: '{.authorization.mode}'
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set: true
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compare:
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op: nothave
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value: AlwaysAllow
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remediation: |
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If using a Kubelet config file, edit $kubeletconf to set authorization: mode to Webhook. If
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using executable arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_AUTHZ_ARGS variable.
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--authorization-mode=Webhook
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: V-242397
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text: "The Kubernetes kubelet static PodPath must not enable static pods (Automated)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- path: '{.staticPodPath}'
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set: false
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remediation: |
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Edit $kubeletconf on each node to to remove the staticPodPath
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Based on your system, restart the kubelet service. For example,
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: V-242415
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text: "Secrets in Kubernetes must not be stored as environment variables.(Manual)"
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type: "manual"
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remediation: |
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Run the following command:
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kubectl get all -o jsonpath='{range .items[?(@..secretKeyRef)]} {.kind} {.metadata.name} {"\n"}{end}' -A
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If any of the values returned reference environment variables
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rewrite application code to read secrets from mounted secret files, rather than
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from environment variables.
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scored: false
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- id: V-242434 # CIS 3.2.6
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text: "Kubernetes Kubelet must enable kernel protection (Automated)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --protect-kernel-defaults
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path: '{.protectKernelDefaults}'
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set: true
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compare:
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op: eq
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value: true
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remediation: |
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If using a Kubelet config file, edit $kubeletconf to set protectKernelDefaults: true.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--protect-kernel-defaults=true
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: V-242435
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text: "Kubernetes must prevent non-privileged users from executing privileged functions (Automated)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --authorization-mode
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path: '{.authorization.mode}'
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set: true
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compare:
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op: nothave
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value: AlwaysAllow
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remediation: |
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If using a Kubelet config file, edit $kubeletconf to set authorization: mode to Webhook. If
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using executable arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_AUTHZ_ARGS variable.
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--authorization-mode=Webhook
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: V-242393
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text: "Kubernetes Worker Nodes must not have sshd service running. (Automated)"
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audit: '/bin/sh -c ''systemctl show -p ActiveState sshd'' '
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tests:
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test_items:
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- flag: ActiveState
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compare:
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op: eq
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value: inactive
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remediation: |
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To stop the sshd service, run the command: systemctl stop sshd
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scored: true
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- id: V-242394
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text: "Kubernetes Worker Nodes must not have the sshd service enabled. (Automated)"
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audit: "/bin/sh -c 'systemctl is-enabled sshd.service'"
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tests:
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test_items:
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- flag: "disabled"
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remediation: |
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To disable the sshd service, run the command:
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chkconfig sshd off
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scored: true
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- id: V-242395
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text: "Kubernetes dashboard must not be enabled. (Manual)"
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type: "manual"
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remediation: |
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Run the command: kubectl get pods --all-namespaces -l k8s-app=kubernetes-dashboard
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If any resources are returned, this is a finding.
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Fix Text: Delete the Kubernetes dashboard deployment with the following command:
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kubectl delete deployment kubernetes-dashboard --namespace=kube-system
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scored: false
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- id: V-242398
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text: "Kubernetes DynamicAuditing must not be enabled. (Automated)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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bin_op: or
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test_items:
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- flag: "--feature-gates"
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compare:
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op: nothave
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value: "DynamicAuditing=true"
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set: true
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- flag: "--feature-gates"
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set: false
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remediation: |
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Edit any manifest files or kubelet config files that contain the feature-gates
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setting with DynamicAuditing set to "true".
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Set the flag to "false" or remove the "DynamicAuditing" setting
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completely. Restart the kubelet service if the kubelet config file
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if the kubelet config file is changed.
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scored: true
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- id: V-242399
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text: "Kubernetes DynamicKubeletConfig must not be enabled. (Automated)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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bin_op: or
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test_items:
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- flag: "--feature-gates"
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compare:
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op: nothave
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value: "DynamicKubeletConfig=true"
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set: true
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- flag: "--feature-gates"
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set: false
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remediation: |
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Edit any manifest files or $kubeletconf that contain the feature-gates
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setting with DynamicKubeletConfig set to "true".
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Set the flag to "false" or remove the "DynamicKubeletConfig" setting
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completely. Restart the kubelet service if the kubelet config file
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if the kubelet config file is changed.
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scored: true
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- id: V-242404 # CIS 3.2.8
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text: "Kubernetes Kubelet must deny hostname override (Automated)"
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# This is one of those properties that can only be set as a command line argument.
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# To check if the property is set as expected, we need to parse the kubelet command
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# instead reading the Kubelet Configuration file.
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audit: "/bin/ps -fC $kubeletbin "
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tests:
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test_items:
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- flag: --hostname-override
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set: false
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remediation: |
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Edit the kubelet service file $kubeletbin
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on each worker node and remove the --hostname-override argument from the
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KUBELET_SYSTEM_PODS_ARGS variable.
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: V-242406
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text: "The Kubernetes kubelet configuration file must be owned by root (Automated)"
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audit: '/bin/sh -c ''if test -e $kubeletkubeconfig; then stat -c %U:%G $kubeletkubeconfig; fi'' '
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tests:
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test_items:
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- flag: root:root
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remediation: |
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Run the below command (based on the file location on your system) on the each worker node.
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For example,
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chown root:root $kubeletkubeconfig
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scored: true
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- id: V-242407
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text: "The Kubernetes kubelet configuration files must have file permissions set to 644 or more restrictive (Automated)"
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audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c permissions=%a $kubeletconf; fi'' '
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tests:
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test_items:
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- flag: "permissions"
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compare:
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op: bitmask
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value: "644"
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remediation: |
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Run the following command (using the config file location identified in the Audit step)
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chmod 644 $kubeletconf
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scored: true
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- id: V-242414
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text: "The Kubernetes cluster must use non-privileged host ports for user pods. (Manual)"
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type: "manual"
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remediation: |
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For any of the pods that are using ports below 1024,
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reconfigure the pod to use a service to map a host non-privileged
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port to the pod port or reconfigure the image to use non-privileged ports.
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scored: false
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- id: V-242442
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text: "Kubernetes must remove old components after updated versions have been installed. (Manual)"
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type: "manual"
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remediation: |
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To view all pods and the images used to create the pods, from the Master node, run the following command:
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kubectl get pods --all-namespaces -o jsonpath="{..image}" | \
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tr -s '[[:space:]]' '\n' | \
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sort | \
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uniq -c
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Review the images used for pods running within Kubernetes.
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Remove any old pods that are using older images.
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scored: false
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- id: V-242396
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text: "Kubernetes Kubectl cp command must give expected access and results. (Manual)"
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type: "manual"
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remediation: |
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If any Worker nodes are not using kubectl version 1.12.9 or newer, this is a finding.
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Upgrade the Master and Worker nodes to the latest version of kubectl.
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scored: false
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