DeFi Smart Contract Vulnerabilities Audit Guide

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

1. Reentrancy Vulnerability

Description:

Reentrancy occurs when a contract calls an external contract (e.g., another DEX or wallet) and that external contract calls back into the vulnerable contract before the first call is complete. This allows an attacker to repeatedly execute a function (like withdraw()) before the internal state (e.g., user balance) is updated.

Specific Detection Methods:

• Static Analysis with Control Flow Graphs (CFG): Use tools like Slither, Mythril, or Echidna to build a CFG. Look for functions that:
  1. Perform an external call (call, delegatecall, or high-level Solidity function calls to external contracts).
  2. Are accessible from the same function or a function called by the external contract (via `