"Retired" Medium Machine

Hi everyone! Can someone give me a clue about the new medium cahine “Retired”. I have found an LFI. I’ve searched for important files through LFI but found nothing important other than a binary running on port 1337 local to the machine. I tried to do a poisoning log without success. But when sending my IP address through the LFI, I receive a GET request to my local server in python.