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Athackcon CTF 2021

Challenges written based on real-life scenarios that I discovered in bug-bounty and during penetration testing engagements.

Github

A Github repository that contains all challenges.

Environment setup on Ubuntu

Requirments

  • Install docker-engine
  • Install docker-compose
Install Docker and docker-compose.
# Update apt package index
sudo apt update
# Allow apt to use repository over HTTPS
sudo apt install \
apt-transport-https \
ca-certificates \
curl \
gnupg \
lsb-release
# Add Docker's official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
# X86_64 / amd64
echo \
"deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
# Update apt package index
sudo apt update
# Install the latest version of docker engine and containerd.
sudo apt-get install docker-ce docker-ce-cli containerd.io
# Download docker-compose version 1.29
sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
# Apply executable permissions to the binary
sudo chmod +x /usr/local/bin/docker-compose
# Add user to docker group
sudo usermod -aG docker $(whoami)
Reboot the machine.
sudo reboot
Install git.
sudo apt install git
Clone the repository.
git clone https://github.com/Diefunction/tcc-ctf.git
After cloning the repository change the current directory to the repository directory.
cd tcc-ctf
Builds Docker images from Dockerfiles.
docker-compose build
Create and start containers
docker-compose up

Challenges

Name
IPAddress
Flag
Trust
127.0.0.1:8000
/usr/src/app/flag.txt
Config
127.0.0.1:8001
/flag/flag.txt
Extend
127.0.0.1:8002
/usr/src/app/flag.txt
Poison
127.0.0.1:8003
/usr/src/app/flag.txt