During Docker pulls validation and extraction of the manifest object from its JSON representation are done in separate steps. The digest that represents the manifest corresponds to a hash of the payload portion of the JSON blob returned by the remote registry. Even though the validity of the payload portion is being verified, an injection of new attributes in the surrounding JSON object is possible. This allows an override of the verified content at JSON deserialization time leading to pulling unverified layers.
Created docker-io tracking bugs for this issue: Affects: fedora-all [bug 1271261]
This issue is exploitable by malicious Docker images. Red Hat supports images from it's own registry, ISV images certified by the Red Hat certification program, and images using qualified customer content. Marking this vulnerability and its children as "WONTFIX".
We will get the fix from docker when we release docker-1.9.
Statement: This issue is exploitable by malicious Docker images. Red Hat supports images from it's own registry, ISV images certified by the Red Hat certification program, and images using qualified customer content.
Fixed in 1.8.3 and greater.