Here are three of the most common and critical smart contract vulnerabilities in Decentralized Finance (DeFi), along with specific detection methods for each.
1. Reentrancy Attacks
Description:
A reentrancy attack occurs when a smart contract calls an external contract (e.g., paying out funds) without first updating its internal state (e.g., balances). An attacker can exploit this by calling back into the vulnerable function before the state update completes, allowing them to withdraw funds multiple times.
How to Detect It:
-
Static Analysis Tools: Use tools like Slither or Mythril. They flag functions that make external calls (
call,delegatecall) before state variables are modified. -
Code Pattern Inspection: Look for the "Checks-Effects-Interactions" pattern violation. Ensure that:
- Checks: Validate inputs and permissions.
- Effects: Update internal state (e
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