OOO archive --- DEF CON CTF [ login ]

dc2021q - cozen guest_challenge reversing pwn

by Lightning

This was a jeopardy challenge, part of dc2021q.

This challenge was represented as
Points: 500

You may spawn the server:

On your laptop
  • Install docker
  • docker pull archiveooo/pub:cozen (docker-saved download)
  • docker run -d --name cozen archiveooo/pub:cozen
  • Local IP: docker inspect cozen -f '{{ .NetworkSettings.Networks.bridge.IPAddress }}'
  • Connect to that IP:51015 — Remember to docker rm -f when done.
On your laptop (full source)
  • Install docker and pip install PyYAML coloredlogs
  • git clone
  • cd cozen
  • ./spawner --log-level=INFO
  • Connect to the ip:port displayed
Hosted by OOO Right now we're asking players to login first.


Welcome to Lightning's BBS

This was a guest challenge from Lightning, of legitbs fame (the previous DEF CON CTF hosts)

Join #cozen on hackint


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


Spoilers ahead! Code for this challenge is publicly available.