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In some environments, it is required that the docker daemon is accessible remotely. In such cases, the docker daemon is configured to listen over TCP socket. But as the docker daemon doesn't support authentication, exposing it over TCP will allow anyone on the internet to locate and abuse it. And, we already know that a privileged container can lead to compromise of the host machine.
The admin aware of this risk, deployed a docker authorization plugin to prevent misuse of the exposed docker socket. The plugin allows interaction with the docker daemon only if a particular bypass token is either present in the request headers or is passed as an environment variable with the docker command (--env or -e option). However, as the bypass token is passed in the environment variable, the compromise of a running container could reveal the bypass token required to interact with the docker daemon.
Objective: Compromise the web application container, retrieve the bypass token and interact with the docker daemon. Then, run a privileged container and retrieve the flag!
You might need the following credentials for exploitation:
- This lab is dedicated to you! No other users are on this network :)
- Once you start the lab, you will have access to a root terminal of a Kali instance
- Your Kali has an interface with IP address 192.X.Y.2. Run "ip addr" to know the values of X and Y.
- The target server should be located at the IP address 192.X.Y.3.
- Do not attack the gateway located at IP address 192.X.Y.1
- postgresql is not running by default so Metasploit may give you an error. Ignore it.
The following activities are strictly prohibited on this website unless otherwise explicitly stated as allowed in the mission statement:
- Using automated scanners
- Using brute force attacks
- Denial of Service attacks
- Attacking other student machines in challenges where you might achieve a shell on the vulnerable system
- Attacking the lab infrastructure
Users violating the above will be either temporarily or permanently banned from the website.
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