DeFi Smart Contract Vulnerabilities Audit Guide

Here are three common DeFi smart contract vulnerabilities, along with specific methods to detect them:

1. Reentrancy

Description:

Reentrancy occurs when a contract calls an external contract and allows that external contract to call back into the original contract before the first call has finished. This can allow an attacker to repeatedly withdraw funds before the contract’s state (e.g., user balances) is updated.

How to Detect:

• Static Analysis: Use tools like Slither, Mythril, or Securify to identify functions that make external calls (call, delegatecall) while modifying state variables (e.g., balanceOf[msg.sender]).
  • Specific Pattern: Look for state-changing operations (SWEs) that occur after an external call in the same function without using the Checks-Effects-Interactions (CEI) pattern.
• Manual Code Review:
  • Identify all