Guides

Ensure that the --streaming-connection-idle-timeout argument is not set to 0 (Kubelet)

Do not disable timeouts on streaming connections. Setting idle timeouts ensures that you are protected against Denial-of-Service attacks, inactive connections and running out of ephemeral ports.

Suggest Edits

Risk Level: High
Cloud Entity: Node
CloudGuard Rule ID: D9.K8S.NET.03
Covered by Spectral: Yes
Category: Compute

GSL LOGIC

KubernetesNode where not kubeletData isEmpty() should have kubeletData.kubeletconfig.streamingConnectionIdleTimeout != '0'

REMEDIATION

  • If using a Kubelet config file, edit the file to set streamingConnectionIdleTimeout to a
    value other than 0.

  • If using command line arguments, edit the kubelet service file
    $kubeletsvc on each worker node and
    set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
    --streaming-connection-idle-timeout=5m
    Based on your system, restart the kubelet service. For example:
    systemctl daemon-reload
    systemctl restart kubelet.service

  • If using the api configz endpoint consider searching for the status of
    streamingConnectionIdleTimeout by extracting the live configuration from the nodes
    running kubelet.
    **See detailed step-by-step configmap procedures in
    https://kubernetes.io/docs/tasks/administer-cluster/reconfigure-kubelet/

References

  1. https://kubernetes.io/docs/admin/kubelet/
  2. https://github.com/kubernetes/kubernetes/pull/18552

Node

A node is a worker machine in Kubernetes, previously known as a minion. A node may be a VM or physical machine, depending on the cluster. Each node contains the services necessary to run pods and is managed by the master components. The services on a node include the container runtime, kubelet and kube-proxy.

Compliance Frameworks

  • CIS Amazon Elastic Kubernetes Service (EKS) Benchmark v1.0.1
  • CIS Amazon Elastic Kubernetes Service (EKS) Benchmark v1.1.0
  • CIS Amazon Elastic Kubernetes Service (EKS) Benchmark v1.2.0
  • CIS Amazon Elastic Kubernetes Service (EKS) Benchmark v1.3.0
  • CIS Google Kubernetes Engine (GKE) Benchmark v1.2.0
  • CIS Google Kubernetes Engine (GKE) Benchmark v1.4.0
  • CIS Kubernetes Benchmark v1.20
  • CIS Kubernetes Benchmark v1.23
  • CIS Kubernetes Benchmark v1.24
  • CIS Kubernetes Benchmark v1.4.0
  • CIS Kubernetes Benchmark v1.5.1
  • CIS Kubernetes Benchmark v1.6.1
  • CIS Microsoft Kubernetes Engine (AKS) Benchmark v1.3.0
  • CIS OpenShift Container Platform v4 Benchmark v1.1.0
  • CIS OpenShift Container Platform v4 Benchmark v1.4.0
  • Kubernetes NIST.SP.800-190
  • Kubernetes v.1.13 CloudGuard Best Practices
  • Kubernetes v.1.14 CloudGuard Best Practices
  • OpenShift Container Platform v3

Updated about 1 year ago