DeFi Smart Contract Vulnerabilities Audit Guide

Here are three common DeFi smart contract vulnerabilities, along with specific detection methods for each:

1. Reentrancy Vulnerability

Description:

Reentrancy occurs when a smart contract calls an external contract (e.g., a user-controlled wallet or another DeFi protocol) before updating its internal state. This allows an attacker to recursively call the same function again before the original call completes, potentially draining funds.

Specific Detection Methods:

• Static Analysis Tools: Use tools like Slither (by Trail of Bits) or MythX. Look for patterns where ETH or ERC-20 transfer()/transferFrom() calls are made before state variable updates (e.g., before balanceOf[msg.sender] -= amount).

solidity
  // Vulnerable Pattern
  function withdraw(uint amount) public {
      require(balances[msg.sender] >= amount);
      (bool success