cyberstrikeus Ensure insecure registries are not used
Profile Applicability: Level 1 - Docker - Linux
Assessment Status: Manual
Description
Docker considers a private registry either secure or insecure. By default, registries are considered secure.
Rationale
A secure registry uses TLS. A copy of registry's CA certificate is placed on the Docker host at /etc/docker/certs.d/<registry-name>/ directory. An insecure registry is one which does not have a valid registry certificate, or one not using TLS. Insecure registries should not be used as they present a risk of traffic interception and modification.
Additionally, once a registry has been marked as insecure commands such as docker pull, docker push, and docker search will not result in an error message and users may indefinitely be working with this type of insecure registry without ever being notified of the risk of potential compromise.
Impact
None.
Audit Procedure
You should execute the command below to find out if any insecure registries are in use:
docker info --format 'Insecure Registries:
{{.RegistryConfig.InsecureRegistryCIDRs}}'
Remediation
You should ensure that no insecure registries are in use.
Default Value
By default, Docker assumes all, but local, registries are secure.
References
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 2.5 Allowlist Authorized SoftwareUse technical controls, such as application allowlisting, to ensure that only authorized software can execute or be accessed. Reassess bi-annually, or more frequently. | ● | ● | |
| v7 | 14.4 Encrypt All Sensitive Information in TransitEncrypt all sensitive information in transit. | ● | ● |
Profile/Assessment Status
Profile: Level 1 - Docker - Linux Assessment Status: Manual