Ethereum CTF Solutions Repository

Welcome to my repository dedicated to solving well-known Ethereum Capture the Flag (CTF) challenges. This repository aims to provide detailed solutions, explanations, and learnings from various Ethereum CTFs to help others understand and tackle common smart contract vulnerabilities.

Table of Contents

• Ethereum CTF Solutions Repository
  • Table of Contents
  • Introduction
  • List of CTFs
    • Ethernaut
    • Capture the Ether
    • Damn Vulnerable DeFi
  • How to Use
  • Contributing
  • Resources
  • License

Introduction

Ethereum CTFs are interactive security challenges designed to educate players on smart contract vulnerabilities. Each challenge typically involves identifying and exploiting security flaws in Ethereum smart contracts. This repository contains my solutions to these challenges, with the goal of helping others learn and improve their smart contract security skills.

List of CTFs

Ethernaut

Ethernaut is a Web3/Solidity-based wargame played in the Ethereum Virtual Machine. Each level is a smart contract that needs to be hacked.

• Level 1: Fallback
• Level 2: Fallout
• Level 3: Coin Flip
• Level 4: Telephone
• Level 5: Token
• Level 6: Delegation
• Level 7: Force
• Level 8: Vault
• Level 9: King
• Level 10: Reentrancy
• ...

Capture the Ether

Capture the Ether is another game of Ethereum smart contract security challenges. The game consists of a series of challenges in different categories, each focusing on specific types of vulnerabilities.

• Warmup: Hello Ethernaut
• Lotteries: Predict the future
• Lotteries: Predict the block hash
• Math: Token sale
• Math: Token whale
• ...

Damn Vulnerable DeFi

Damn Vulnerable DeFi is a set of challenges focusing on decentralized finance (DeFi) vulnerabilities.

• Challenge 1: Unstoppable
• Challenge 2: Naive receiver
• Challenge 3: Truster
• Challenge 4: Side entrance
• Challenge 5: The rewarder
• ...

How to Use

1. Clone the repository:

   git clone https://github.com/smbsp/ctfs.git
   cd ctfs

2. Navigate to the folder of the desired CTF challenge.

3. Read through the solution and understand the exploitation technique used.

4. Try to replicate the solution on your local setup.

Contributing

Contributions are welcome! If you have solved additional CTF challenges or have improved solutions, please feel free to submit a pull request.

Resources

• Ethernaut
• Capture the Ether
• Damn Vulnerable DeFi

License

This project is licensed under the MIT License - see the LICENSE file for details.