DeFi Smart Contract Vulnerabilities Audit Guide

Here are three of the most prevalent and dangerous DeFi smart contract vulnerabilities, along with specific, technical methods to detect them.

1. Reentrancy Attacks

What it is:

A reentrancy attack occurs when a smart contract calls an external contract (e.g., to send ETH) before it has finished updating its internal state (e.g., updating a balance). If the external contract is malicious, it can re-enter the vulnerable function before the state update completes, allowing the attacker to drain funds multiple times.

How to Detect It:

1. Static Analysis with Specialized Tools:
   • Use tools like Slither, Mythril, or Echidna.
   • Slither has a specific detector: slither . -d reentrancy-eth or slither . -d reentrancy-balance.
   • Mythril can simulate symbolic