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Challenge Information

  • Name: Zero Storage
  • Type: Web
  • Description:
1. There are two flags in this challenge. Flag A is in admin's uploaded file, and Flag B is admin's password. Note the two flags are independent. You can get either flag without the other one.
2. The source code is attached. Except for `zerostorage/app/server.py`, there is no intended vulnerability in this challenge, so basically just readling `server.py` is sufficient to get the two flags.
3. Enjoy the challenge!
  • Files provided: docker/, but without docker-compose.yaml.
  • Solves:
    • FLAG A (XSS): 47 / 55, (95 teams in total, but only 55 teams with scores > 1)
    • FLAG B (session): 41 / 55

Build

docker-compose build
docker-compose up

Writeup

TBD