Docker CLI commands must be run with an MKE client trust bundle and without unnecessary permissions.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-260938	CNTR-MK-001180	SV-260938r986163_rule		Medium

Description
Running docker CLI commands remotely with a client trust bundle ensures that authentication and role permissions are checked for the command. Using --privileged option or --user option in docker exec gives extended Linux capabilities to the command. Do not run docker exec with the --privileged or --user options, especially when running containers with dropped capabilities or with enhanced restrictions. By default, docker exec command runs without --privileged or --user options.

Description

Running docker CLI commands remotely with a client trust bundle ensures that authentication and role permissions are checked for the command. Using --privileged option or --user option in docker exec gives extended Linux capabilities to the command. Do not run docker exec with the --privileged or --user options, especially when running containers with dropped capabilities or with enhanced restrictions. By default, docker exec command runs without --privileged or --user options.

STIG	Date
Mirantis Kubernetes Engine Security Technical Implementation Guide	2024-06-17

Details

Check Text ( C-64667r966169_chk )
The host OS must be locked down so that only authorized users with a client bundle can access docker commands. To ensure that no commands with privilege or user authorizations are present via CLI: Linux: As a trusted user on the host operating system, use the below command to filter out docker exec commands that used --privileged or --user option. sudo ausearch -k docker \| grep exec \| grep privileged \| grep user If there are any in the output, then this is a finding.

Check Text ( C-64667r966169_chk )

The host OS must be locked down so that only authorized users with a client bundle can access docker commands.

To ensure that no commands with privilege or user authorizations are present via CLI:

Linux: As a trusted user on the host operating system, use the below command to filter out docker exec commands that used --privileged or --user option.

sudo ausearch -k docker | grep exec | grep privileged | grep user

If there are any in the output, then this is a finding.

Fix Text (F-64575r966170_fix)
Docker CLI command must only be run with a client bundle and must not use --privileged or --user option. Refer to https://docs.mirantis.com/mke/3.7/ops/access-cluster/client-bundle/configure-client-bundle.html?highlight=client%20bundle.