SV-242380r960759: The Kubernetes etcd must use TLS to protect the confidentiality of sensitive data during electronic dissemination. | Kubernetes STIG SCAP Benchmark

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Assessment Title

Rule Text

The Kubernetes etcd must use TLS to protect the confidentiality of sensitive data during electronic dissemination.

Description

Discussion Text

The Kubernetes API Server will prohibit the use of SSL and unauthorized versions of TLS protocols to properly secure communication. The use of unsupported protocol exposes vulnerabilities to the Kubernetes by rogue traffic interceptions, man-in-the-middle attacks, and impersonation of users or services from the container platform runtime, registry, and keystore. To enable the minimum version of TLS to be used by the Kubernetes API Server, the setting "--peer-auto-tls" must be set.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000068

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  peer-auto-tls * 

If the setting "--peer-auto-tls" is not configured in the Kubernetes etcd manifest file or it is set to "true", 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:242380
# The Kubernetes etcd must use TLS to protect the confidentiality of sensitive data during electronic dissemination.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# textfilecontent54_object (textfilecontent54_test)
test_1() {
  (sed -En 's/(?i)^[ -]*peer-auto-tls=(\w+)/\1/p' '/etc/kubernetes/manifests/etcd.yaml') | grep -qxF 'false'
}

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

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL Definition: oval:mil.disa.stig.kubernetes:def:242380

ETCD_MANIFEST="/etc/kubernetes/manifests/etcd.yaml"
MATCH_PATTERN="^(?i)^[ -]*peer-auto-tls=(\\w+)$"

if [ ! -f "$ETCD_MANIFEST" ]; then
  echo "PASS"
  exit 0
fi

awk -F'=' "/$MATCH_PATTERN/ { print \$2 }" "$ETCD_MANIFEST" | grep -q "false" || {
  echo "FAIL"
  exit 1
}

echo "PASS"
exit 0

Remediation

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

Set the value of "--peer-auto-tls" to "false".