DeFi Smart Contract Vulnerabilities Audit Guide

Here's a thinking process:

1. Understand User Request:

   • User wants: 3 common DeFi smart contract vulnerabilities
   • For each: how to detect them
   • Must be specific

2. Identify Key DeFi Smart Contract Vulnerabilities:
   I need to pick 3 that are very common, well-documented, and have specific detection methods. Good candidates:

   • Reentrancy attacks
   • Integer overflow/underflow (though less common now with Solidity ^0.8.0, still relevant in older code or other languages)
   • Access control issues (owner-only functions, proxy patterns)
   • Flash loan attacks / oracle manipulation
   • Front-running / MEV issues
   • Timestamp dependence
   • Unchecked return values
   • Logic errors in tokenomics

Let's pick the most impactful and commonly tested/found ones:

1. Reentrancy