cis-docker-7.8

DevOps & Security

Ensure that CA certificates are rotated as appropriate

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7.8 Ensure that CA certificates are rotated as appropriate (Manual)

Profile Applicability

Level 1 - Docker Swarm

Description

You should rotate root CA certificates as appropriate.

Rationale

Docker Swarm uses TLS for clustering operations between its nodes. Certificate rotation ensures that in an event such as a compromised node or key, it is difficult to impersonate a node. Node certificates depend upon root CA certificates. For operational security, it is important to rotate these frequently. Currently, root CA certificates are not rotated automatically and you should therefore establish a process for rotating them in line with your organizational security policy.

Impact

None

Audit Procedure

You should check the time stamp on the root CA certificate file. For example:

ls -l /var/lib/docker/swarm/certificates/swarm-root-ca.crt

The certificate should show a time stamp in line with the organizational rotation policy.

Remediation

You should run the command below to rotate a certificate.

docker swarm ca --rotate

Default Value

By default, root CA certificates are not rotated.

References

https://docs.docker.com/engine/swarm/how-swarm-mode-works/pki/#rotating-the-ca-certificate

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	5.2 Use Unique PasswordsUse unique passwords for all enterprise assets. Best practice implementation includes, at a minimum, an 8-character password for accounts using MFA and a 14-character password for accounts not using MFA.	●	●	●
v7	4.4 Use Unique PasswordsWhere multi-factor authentication is not supported (such as local administrator, root, or service accounts), accounts will use passwords that are unique to that system.		●	●