cyberstrikeus CIS Docker Benchmark v1.7.0 - Control 4.5
Profile Applicability
- Level 2 - Docker - Linux
Description
Content trust is disabled by default and should be enabled in line with organizational security policy.
Rationale
Content trust provides the ability to use digital signatures for data sent to and received from remote Docker registries. These signatures allow client-side verification of the identity and the publisher of specific image tags and ensures the provenance of container images.
Impact
In an environment where DOCKER_CONTENT_TRUST is set, you are required to follow trust procedures whilst working with the image related commands - build, create, pull, push and run. You can use the --disable-content-trust flag to run individual operations on tagged images without content trust on an as needed basis, but this defeats the purpose of enabling content trust and therefore should be avoided wherever possible.
Note: Content trust is currently only available for users of the public Docker Hub. It is currently not available for the Docker Trusted Registry or for private registries.
Audit Procedure
You should execute the following command:
echo $DOCKER_CONTENT_TRUST
This should return a value of 1.
Remediation
To enable content trust in a bash shell, you should enter the following command:
export DOCKER_CONTENT_TRUST=1
Alternatively, you could set this environment variable in your profile file so that content trust is enabled on every login.
Default Value
By default, content trust is disabled.
References
- https://docs.docker.com/engine/security/trust/
- https://docs.docker.com/notary/service_architecture/
- https://docs.docker.com/engine/reference/commandline/cli/#environment-variables
CIS Controls
v8:
- 3 Data Protection - Develop processes and technical controls to identify, classify, securely handle, retain, and dispose of data.
v7:
- 13 Data Protection - Data Protection
Assessment Status
Manual