DeFi Smart Contract Vulnerabilities Audit Guide

Here are three common DeFi smart contract vulnerabilities, along with specific methods for detecting them:

1. Reentrancy Attacks

Description:

A reentrancy attack occurs when a smart contract makes an external call to an untrusted contract (e.g., transferring ETH or tokens) before updating its internal state. The external contract can then re-enter the vulnerable function (via a fallback function) before the state update completes, allowing an attacker to exploit the stale state multiple times.

Specific Detection Methods:

• Static Analysis Tools: Use tools like Slither, Mythril, or Securify to automatically detect functions that perform external calls before state changes. Look for warnings such as reentrancy-eth or reentrancy-benign.
• Code Pattern Inspection: Manually review functions that:
  1. Transfer funds (e.g., address payable.to.transfer() or `call{value