Cis Docker V170 5.24

CIS Docker Benchmark v1.7.0 - Control 5.24

Profile Applicability

• Level: 2
• Type: Manual
• Platform: Docker - Linux

Description

You should not use docker exec with the --user=root option.

Rationale

Using the --user=root option in a docker exec command, executes it within the container as the root user. This could potentially be insecure, particularly when you are running containers with reduced capabilities or enhanced restrictions.

For example, if your container is running as a tomcat user (or any other non-root user), it would be possible to run a command through docker exec as root with the --user=root option. This could potentially be dangerous.

Impact

None.

Audit Procedure

If you have auditing enabled as recommended in Section 1, you can use the command below to filter out docker exec commands that use the --user=root option.

ausearch -k docker | grep exec | grep user

Remediation

You should not use the --user=root option in docker exec commands.

Default Value

By default, the docker exec command runs without the --user option.

References

1. https://docs.docker.com/engine/reference/commandline/exec/

CIS Controls

v8:

• 5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts
  • Restrict administrator privileges to dedicated administrator accounts on enterprise assets. Conduct general computing activities, such as internet browsing, email, and productivity suite use, from the user's primary, non-privileged account.

v7:

• 4 Controlled Use of Administrative Privileges
  • Controlled Use of Administrative Privileges