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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 start a container and is allowed to bind mount "/tmp" directory of the host file system. All other options such as binding volume, providing additional capabilities, etc are disallowed. As the student user can mount a writable directory on the container, it is possible to escalate to root.
Objective: Leverage the misconfiguration, escalate to the root user on the host machine and retrieve the flag!
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