Ensure that only approved images are used in your environment

There’s enough change and volatility in a container ecosystem without allowing unknown containers as well. Allow only approved container images. Have tools and processes in place to monitor for and prevent the use of unapproved container images.

An effective way of reducing the attack surface and preventing developers from making critical security mistakes is to control the flow of container images into your development environment. For example, you might sanction a single Linux distribution as a base image, preferably one that is lean (Alpine or CoreOS rather than Ubuntu), to minimize the surface for potential attacks.

Image signing or fingerprinting can provide a chain of custody that enables you to verify the integrity of the containers. For example, Azure Container Registry supports Docker's content trust model, which allows image publishers to sign images that are pushed to a registry, and image consumers to pull only signed images.

Permit only approved registries

An extension of ensuring that your environment uses only approved images is to permit only the use of approved container registries. Requiring the use of approved container registries reduces your exposure to risk by limiting the potential for the introduction of unknown vulnerabilities or security issues.


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