SV-242389r1137640: The Kubernetes API server must have the secure port set. | Kubernetes STIG SCAP Benchmark

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Assessment Title

Rule Text

The Kubernetes API server must have the secure port set.

Description

Discussion Text

By default, the API server will listen on what is rightfully called the secure port, port 6443. Any requests to this port will perform authentication and authorization checks. If this port is disabled, anyone who gains access to the host on which the Control Plane is running has full control of the entire cluster over encrypted traffic. Open the secure port by setting the API server's "--secure-port" flag to a value other than "0".

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000213

References

DPMS Target Kubernetes DISA DPMS Target Kubernetes 5376

Checks

DISA STIG (Manual Reference)

Change to the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Run the command:

grep -i secure-port * 

If the setting "--secure-port" is set to "0" or is not configured in the Kubernetes API manifest file, this is a finding.

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.kubernetes:def:242389
# The Kubernetes API server must have the secure port set.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies secure-port is set to a value other than 0 in /etc/kubernetes/manifests/kubi-apiserver.yaml
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  [ "$(sed -En 's/^(?i)[ -]*secure-port=(\d+)[ ]*$/\1/p' '/etc/kubernetes/manifests/kube-apiserver.yaml')" -gt 0 ]
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

Remediation

Edit the Kubernetes API Server manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. 

Set the value of "--secure-port" to a value greater than "0".