Container Images for pwncat CI/CD-based testing

These container images serve as GitHub Actions "service" containers to provide bind and reverse shells as well as SSH for linux hosts. This allows us to point pytest at these existing instances and run automated testing.

Linux Containers (Ubuntu/CentOS)

Each Linux container exposes three ports:

• SSH via Port 22
• Bind Shell via Port 4444
• Reverse Shell Trigger via Port 9999

To trigger a reverse shell, send a line of text to :9999 containing a host/port combo. For example:

echo "$LISTENER_IP:4444" > /dev/tcp/$CONTAINER_IP/9999

This will trigger a connection from the container to $LISTENER_IP on port 4444. This is easiest if both the listener and the vulnerable host are containers.

Windows Containers

The windows container runs similar services except without the SSH service. It will start a bind shell on port 4444, and a reverse shell trigger on 9999. The reverse shell trigger behaves in the same way as the Linux version. The key difference with Windows is that the bind shell can only handle a single connection at a time. Further connections will hang until the first is closed.