DeFi Smart Contract Vulnerabilities Audit Guide

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

1. Reentrancy Attacks

Description:

Reentrancy occurs when a contract calls an external contract (e.g., another user’s wallet or another DeFi protocol) and the external contract calls back into the vulnerable function before the first call has completed. This allows an attacker to reinvest or withdraw funds multiple times within a single transaction, bypassing balance checks.

Specific Detection Methods:

• Static Analysis with Control Flow Graphs (CFG): Use tools like Slither or Mythril to build a CFG of each function. Look for functions that:
  1. Modify state variables (e.g., balances[addr] -= amount).
  2. Make external calls (call, delegatecall, or transfers to addresses).
  3. Do not follow the **