###### We intercepted Sophia new defense system. It seems like she is using some kind of filter in the command sent to a certain server. There is also another security measure that we could not identify, we need a bypass.
TL;DR. This print contains the entire solve
It was given to us the dockerfile and some Elixir/Erlang files. So instinctively we build the docker with
docker build .
After we started our docker with
docker run image_id
We can see the following message:
> Inserting 'Elixir.KillMe.Server', get_flag into blacklist
Then we connect to the docker, or the official server, with netcat or similar
nc ip 4000
And ask for the key that was previously blacklisted
I don't know if it was the intended way but this print us the flag