OOO archive --- DEF CON CTF [ login ]

dc2020q - ooo-flag-sharing crypto

by zardus

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

Points: 135
Was solved by: 36 teams
PCAPs: download

You may spawn the server:

On your laptop
  • Install docker
  • docker pull archiveooo/pub:ooo-flag-sharing (docker-saved download)
  • docker run -d --name ooo-flag-sharing archiveooo/pub:ooo-flag-sharing
  • Local IP: docker inspect ooo-flag-sharing -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
  • cd ooo-flag-sharing
  • ./spawner --log-level=INFO
  • Connect to the ip:port displayed
Hosted by OOO Right now we're asking players to login first.


Share flags safely with the latest OOO service!



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


Spoilers ahead! Code for this challenge is publicly available.