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More just leaving this here for historical purposes, as it has a dependency on the Compute PR.
This PR takes advantage of the
worker_harness_container_imageparameter for Dataflow, assuming that a user has theuser_runner_v2parameter open. Because the container image is uncontrolled, a user can push to an arbitrary Docker container which reaches out to the Metadata service and pushes the relevant credentials to an attacker's GCS bucket of choice.