Description
After a few hiccups with the FORTH language (see https://hackropole.fr/en/challenges/pwn/fcsc2023-pwn-may-the-forth/),
our developper has decided to get back to his roots and use a BASIC interpreter.
He assures us that no security vulnerability is exploitable, thanks to compilation flags;
however, an anonymous hacker has sent us this enigmatic message: A=(A+0.
Can you prove our developer wrong by reading the file named flag.txt?
Files
- docker-compose.yml
-
back-to-basic
1.14 MiB – e103fc56c1ff690a9f14f62e2efb70861bc6c03b8f0a2b2c9000d87a6ca39649 -
my_basic-master.zip
1.25 MiB – 7a8fec469598065e025d2afed8173c59f2cc822ddf88497770de052d4048fea3 -
back-to-basic.patch
3.80 KiB – 95fd556eb8a8ea05b53c7183153e2c614dde7a259d50c8f011672e28d7ecc9a5
Author
cde
Challenge Instructions
- First, download docker-compose.yml:
curl https://hackropole.fr/challenges/fcsc2025-pwn-back-to-basic/docker-compose.public.yml -o docker-compose.yml - Launch the challenge by executing in the same folder:
docker compose up - Then, in another console, access the challenge with Netcat:
nc localhost 4000
In case you encounter problems, please consult the FAQ.
Flag
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Writeups
There are no public solutions for this challenge yet, but you can submit yours after getting the flag.