May the Fifth

pwn x86/x64 FCSC 2023 solved on

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Description

A zForth user has, for performance reasons, disabled ASAN and ZF_ENABLE_BOUNDARY_CHECKS, because according to him “setjmp/longjmp is disabled and that is good enough”. Can you prove him wrong by reading the contents of the file containing the flag?

Note: A simpler variant of this challenge is available here: May The Forth.

Files

Authors

cde
Cryptanalyse

Challenge Instructions

  1. First, download docker-compose.yml:
    curl https://hackropole.fr/challenges/fcsc2023-pwn-may-the-fifth/docker-compose.public.yml -o docker-compose.yml
  2. Launch the challenge by executing in the same folder:
    docker compose up
  3. Then, in another console, access the challenge with Netcat:
    nc localhost 4000
⚠️ Important: You must solve the challenge by interacting with the Docker container through the exposed network port. Any other way is not considered valid.

In case you encounter problems, please consult the FAQ.

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Writeups

There are no public solutions for this challenge yet, but you can submit yours after getting the flag.