Here are just some side notes about linux kernel internals I put here to avoid to have to learn same things again and again. Every notes target linux kernel 5.18.12. There will be a lot of code for which I do not comment the whole part.

Once for all is a heap challenge I did during the HackTheBox Cyber Apocalypse event. This is a classic unsorted bin attack plus a FSOP on stdin. Find the tasks and the final exploit here and here.

phonebook is a basic heap challenge I did during the dctf event. It’s basically just a heap overflow wich allows us to overflow a function pointer with for example the address of system.

Faible Ty Réseau is a basic heap-like challenge, it allows us to create a configuration, edit it, call a function pointer on it and finally to free it:

Basically, we have to crack open an electronic safe. It’s locked with an electromagnet and requires a pin to open, moreover it prints an id right before asking for the pin. We previously were given a link to the download page one of the safe’s software update (http://safe-locks.tracs.viarezo.fr/download).

Hello folks ! Here is a write up for the two first pwn challenges of the ASIS CTF. You can find the related files here.