Chef does not offer a specific rollback procedure, but in a proper Chef setup, you have all infrastructure as code within your cookbooks and roles and together with the idempotency Chef guarantees, rolling back a release should only require you to rollback your Chef configuration into the desired state and wait until Chef finished the converging of your nodes.
In case you simply want to reinstall an older version of the CoreMedia DXP 8 packages, all you need to do is to set the specific version you need to rollback to. See Section 4.2.3, “Upgrade a System” for a description how to set specific versions.
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