Here are three common Decentralized Finance (DeFi) smart contract vulnerabilities, along with specific methods to detect them. These vulnerabilities frequently lead to significant financial losses and are critical targets for auditors and security researchers.
1. Reentrancy Attacks
Description:
A reentrancy attack occurs when a smart contract calls an external contract (e.g., sending ETH) before updating its internal state (e.g., reducing the user’s balance). An attacker can exploit this by sending a callback function that re-enters the vulnerable contract before the state update completes, allowing them to drain funds repeatedly.
Specific Detection Methods:
-
Static Analysis with Control Flow Graphs (CFG):
Use tools like Slither, Mythril, or Echidna to analyze the control flow. Look for patterns where:
- An external call (
address.send(),address.call{value: ...}(""), or `IERC
- An external call (
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