RsaCE

pwn crypto x86/x64 FCSC 2020 solved on

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Description

You have found this binary service which allows to execute signed commands on the remote server. You have also gotten your hands on an example that allows you to execute the id command on the server. Your goal is to get a shell on this server.

Note: This challenge has been made for the finale of FCSC 2020.

Files

  • docker-compose.yml
  • RsaCE
    56.59 KiB – ec6910765bba649a775cb9376d9f397432bfbea44193ae8ab68dcd718d7b3bcf
  • signed_id
    256 B – 1c6005e63fab50d270ccccfa1d3c1e5f27316f4bcb484273a7d59765cdd4132b

Author

Cryptanalyse

Challenge Instructions

  1. First, download docker-compose.yml:
    curl https://hackropole.fr/challenges/fcsc2020-pwn-rsace/docker-compose.public.yml -o docker-compose.yml
  2. Launch the challenge by executing in the same folder:
    docker compose up
  3. Then, in another console, access the challenge with Netcat:
    nc localhost 4000
⚠️ Important: You must solve the challenge by interacting with the Docker container through the exposed network port. Any other way is not considered valid.

In case you encounter problems, please consult the FAQ.

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Writeups

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