STIGQter: STIG Summary: Mirantis Kubernetes Engine Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 24 Jul 2024:

MKE must enable kernel protection.

DISA Rule

SV-260933r966156_rule

Vulnerability Number

V-260933

Group Title

SRG-APP-000233-CTR-000585

Rule Version

CNTR-MK-000990

Severity

CAT II

CCI(s)

• CCI-001084 - Isolate security functions from nonsecurity functions.

Weight

10

Fix Recommendation

When using Kubernetes orchestration, edit the Kubernetes Kubelet file in the /etc/sysconfig directory on the Kubernetes Control Plane. Set the argument "--protect-kernel-defaults" to "true".

Reset Kubelet service using the following command:

service kubelet restart

When using Swarm orchestration, review and remove nonsystem containers previously created by these users that allowed capabilities to be added or must be removed using:

docker container rm [container]

Check Contents

Verify kernel protection.

When using Kubernetes orchestration, change to the /etc/sysconfig/ directory on the Kubernetes Control Plane using the command:

grep -i protect-kernel-defaults kubelet

If the setting "protect-kernel-defaults" is set to false or not set in the Kubernetes Kubelet, this is a finding.

When using Swarm orchestration:

Linux: Execute the following command as a trusted user on the host operating system:

docker ps --quiet --all | xargs docker inspect --format '{{ .Name }}: CapAdd={{ .HostConfig.CapAdd }} CapDrop={{ .HostConfig.CapDrop }}'

The command will output all Linux Kernel Capabilities.

If Linux Kernel Capabilities exceed what is defined in the System Security Plan (SSP), this is a finding.

Vulnerability Number

V-260933

Documentable

False

Rule Version

CNTR-MK-000990

Severity Override Guidance

Verify kernel protection.

When using Kubernetes orchestration, change to the /etc/sysconfig/ directory on the Kubernetes Control Plane using the command:

grep -i protect-kernel-defaults kubelet

If the setting "protect-kernel-defaults" is set to false or not set in the Kubernetes Kubelet, this is a finding.

When using Swarm orchestration:

Linux: Execute the following command as a trusted user on the host operating system:

docker ps --quiet --all | xargs docker inspect --format '{{ .Name }}: CapAdd={{ .HostConfig.CapAdd }} CapDrop={{ .HostConfig.CapDrop }}'

The command will output all Linux Kernel Capabilities.

If Linux Kernel Capabilities exceed what is defined in the System Security Plan (SSP), this is a finding.

Check Content Reference

M

Target Key

5595