DeFi Smart Contract Vulnerabilities Audit Guide

Here are three of the most common DeFi smart contract vulnerabilities, along with specific detection methods for each.

1. Reentrancy Attacks

What it is:

A reentrancy attack occurs when a smart contract makes an external call to another contract (or even itself) before completing its internal state updates. An attacker can exploit this by re-entering the vulnerable function via the external call before the state change is finalized, allowing them to drain funds or manipulate state multiple times.

Specific Detection Methods:

• Static Analysis with Control Flow Graphs (CFG): Use tools like Slither or MythX to analyze the control flow. Look for functions that:
  1. Make an external call (call, send, or delegatecall).
  2. Have not yet updated critical state variables (e.g., balances, flags).
  3. Can be re-entered via the external call (