DeFi Smart Contract Vulnerabilities Audit Guide

Here are three common DeFi smart contract vulnerabilities, along with specific detection methods for each:

1. Reentrancy

Description:

Reentrancy occurs when a smart contract makes an external call to an untrusted contract before updating its internal state. An attacker can exploit this by calling back into the vulnerable function within the external call, allowing them to repeatedly drain funds or manipulate state before the original transaction completes.

Specific Detection Methods:

• Static Analysis Tools: Use tools like Slither or Mythril with specific detectors for reentrancy. Slither, for example, flags functions that perform external calls (e.g., address(this).call{value: ...}()) before state variable updates.
• Control Flow Graph (CFG) Analysis: Analyze the CFG of the contract to identify paths where an external call (CALL, DELEGATECALL) precedes a state-changing operation (SSTORE) in