Streaming connections should have timeouts enabled and not be disabled
Set up the kubernetes integration.
Description
Do not disable timeouts on streaming connections.
Rationale
Setting idle timeouts ensures that you are protected against denial-of-service attacks, inactive connections, and running out of ephemeral ports.
Note: By default, --streaming-connection-idle-timeout is set to four hours, which might be too high for your environment. Setting this as appropriate would additionally ensure that such streaming connections are timed out after serving legitimate use cases.
Audit
Run the following command on each node: ps -ef | grep kubelet. Verify that the --streaming-connection-idle-timeout argument is not set to 0. If the argument is not present, and there is a Kubelet config file specified by --config, check that it does not set streamingConnectionIdleTimeout to 0.
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 /etc/systemd/system/kubelet.service.d/10-kubeadm.conf 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
Impact
Long-lived connections could be interrupted.
Default value
By default, --streaming-connection-idle-timeout is set to four hours.
References
- https://kubernetes.io/docs/admin/kubelet/
- https://github.com/kubernetes/kubernetes/pull/18552
CIS controls
Version 6.9 Limitation and Control of Network Ports, Protocols, and Services
