DeFi Smart Contract Vulnerabilities Audit Guide

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

1. Reentrancy Attacks

Description:

Reentrancy occurs when a smart contract makes an external call to another contract before completing its internal state updates. If the external contract is malicious, it can re-enter the vulnerable function multiple times before the initial call completes, allowing an attacker to drain funds or manipulate state.

Specific Detection Methods:

• Static Analysis Tools: Use tools like Slither, Mythril, or Securify to scan for functions that perform external calls (e.g., call, delegatecall, send, transfer) before updating state variables. Slither specifically flags patterns where msg.sender balances are updated after an external call.
• Control Flow Graph (CFG) Analysis: Manually or programmatically inspect the CFG to identify paths where an external call precedes a state