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Bind Mount II
container-security-container-host-security-firewall | Level: Easy | Total Lab Runs: 0 | Premium Lab |
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 and is allowed to bind mount certain directories of the host file system. All other options such as binding volume, providing additional capabilities, etc are disallowed. In the firewall plugin, a regex-based condition checks for the directory being mounted and disallows mounting of /bin, /usr, /home, /root, /tmp and / (root directory) directory. However, one of the important directories was not disallowed and can be leveraged 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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