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Unchecked JSON Attribute
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 but cannot provide additional privileges to it. The docker client interacts with the docker socket using the HTTP REST API and each request passes through docker firewall plugins. The firewall checks the value of certain attributes in the JSON passed in the request and only allows the whitelisted values. One of the attributes in the JSON could not be set through docker client and therefore was not included in firewall checks. This misconfiguration in the firewall can be leveraged to run a container with additional privileges.
Objective: Leverage the misconfiguration, escalate to the root user on the host machine and retrieve the flag!
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