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The Kubernetes Scheduler must have secure binding.


Finding ID Version Rule ID IA Controls Severity
V-242384 CNTR-K8-000300 SV-242384r863960_rule Medium
Limiting the number of attack vectors and implementing authentication and encryption on the endpoints available to external sources is paramount when securing the overall Kubernetes cluster. The Scheduler API service exposes port 10251/TCP by default for health and metrics information use. This port does not encrypt or authenticate connections. If this port is exposed externally, an attacker can use this port to attack the entire Kubernetes cluster. By setting the bind address to localhost (i.e.,, only those internal services that require health and metrics information can access the Scheduler API.
Kubernetes Security Technical Implementation Guide 2022-12-02


Check Text ( C-45659r863755_chk )
Change to the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Run the command:

grep -i bind-address *

If the setting "bind-address" is not set to "" or is not found in the Kubernetes Scheduler manifest file, this is a finding.
Fix Text (F-45617r863756_fix)
Edit the Kubernetes Scheduler manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Set the argument "--bind-address" to "".