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A group of developers was migrating their monolithic applications to microservices architecture. Every developer had a low privileged account on the server. But as building docker images and running containers require additional privileges. Hence, the developers were added to the docker group. However, allowing a low privileged user to start a docker container is equivalent to providing root access on the host machine. And, the administrator was aware of this issue. Hence, he deployed a 3rd party docker firewall plugin which restricts the developers to a selective set of operations.
In this lab exercise, the student user can run a container with seccomp unconfined profile. All other options such as binding volume, providing additional capabilities are disallowed. However, there exists a misconfiguration in the firewall plugin which can be leveraged to gain additional privileges in a running container.
Objective: Run a container with seccomp unconfined profile, leverage it to escalate to the root user on the host machine and retrieve the flag!
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