Parasitizing servers for fun and profit

This repository contains all the resources (slides, proof of concept source code) for my presentation at leHACK in June 2023.

Turning binary files into PNG images for web upload

I developed a small Python tool called Flea that is able to transform any binary file into a valid (but weird looking) PNG file:

$ ./flea.py my-binary-file.pdf output-png-file.png

But also to take such a PNG file in input and extract the embedded data back:

$ ./flea.py --decode output-png-file.png

It can also embed a binary file inside a PNG in a tEXt chunk:

$ ./flea.py --cover something.png my-binary-file.pdf output-png-file.png

Extraction is performed the same way:

$ ./flea.py --decode output-png-file.png

The script demonstrated in the presentation is provided as-is in this repo.