V-242398—Kubernetes DynamicAuditing must not be enabled.

CAT II - Medium

CNTR-K8-000450

>Control Description

Protecting the audit data from change or deletion is important when an attack occurs. One way an attacker can cover their tracks is to change or delete audit records. This will either make the attack unnoticeable or make it more difficult to investigate how the attack took place and what changes were made. The audit data can be protected through audit log file protections and user authorization. One way for an attacker to thwart these measures is to send the audit logs to another source and filter the audited results before sending them on to the original target. This can be done in Kubernetes through the configuration of dynamic audit webhooks through the DynamicAuditing flag.

>Check Content

On the Control Plane, change to the manifests' directory at /etc/kubernetes/manifests and

$grep -i feature-gates * Review the feature-gates setting, if one is returned.

If the feature-gates setting is available and contains the DynamicAuditing flag set to "true", this is a finding. On each Control Plane and Worker node,

$ps -ef | grep kubelet

If the "--feature-gates" option exists, this is a finding. Note the path to the config file (identified by: --config). Inspect the content of the config file: If the "featureGates" setting is present and has the "DynamicAuditing" flag set to "true", this is a finding.

>Remediation

On the Control Plane, change to the manifests' directory at /etc/kubernetes/manifests and

$grep -i feature-gates *

If any "--feature-gates" setting is available and contains the "DynamicAuditing" flag, remove the flag or set it to false. On the each Control Plane and Worker Node,

$ps -ef | grep kubelet

Remove the "--feature-gates option" if present. Note the path to the config file (identified by: --config). Edit the Kubernetes Kubelet config file: If the "featureGates" setting is present, remove the "DynamicAuditing" flag or set the flag to false. Restart the kubelet service

$service kubelet restart

>CCI References

CCI-000213

Control Correlation Identifiers (CCIs) map STIG findings to NIST 800-53 controls.

>Cross-Framework Mappings

NIST SP 800-53 r5

via DISA CCI List

AC-3

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