dc2020q - bytecoooding golf shellcoding

by adamd

This was a golf challenge, part of dc2020q. (CTFtime)

Points: 460
Was solved by: 2 teams
PCAPs: download

You may spawn the server:

On your laptop

Install docker
docker pull archiveooo/pub:bytecoooding (docker-saved download)
docker run -d --name bytecoooding archiveooo/pub:bytecoooding
Local IP: docker inspect bytecoooding -f '{{ .NetworkSettings.Networks.bridge.IPAddress }}'
Connect to that IP:5000 — Remember to docker rm -f when done.

On your laptop (full source)

Install docker and pip install PyYAML coloredlogs
git clone https://github.com/o-o-overflow/dc2020q-bytecoooding-public
cd bytecoooding
./spawner --log-level=INFO
Connect to the ip:port displayed

Hosted by OOO

Currently unavailable.

Description

golf_course

This was a golfing challenge

Golf challenges start with a very high score threshold, which periodically decreases until a team reaches it. At that point, the threshold is set for everyone and the challenge behaves like a regular jeopardy-style one. (Full rules).

Golf challenges borrow the speed element from 2019's speedrun format, rewarding teams that solve the challenge fast and lock the challenge threshold to a high value (where few teams will reach them, ensuring a high point value) but at a much slower pace. They also self-adjust both in difficulty (players set the final threshold) and in score (OOO's point system rewards challenges that are solved by few teams).

if u thought shellcoding was fun, wait until you try bytecoooding

Threshold starts at 8, and decrements by 1 approximately every 5 hours.

line_weight bytecode-docker.tar.gz

Hints

None yet :(
If you wish, you can contribute some.

Source

Spoilers ahead! Code for this challenge is publicly available.