Here are three of the most common and critical DeFi smart contract vulnerabilities, along with specific detection methods for each.
1. Reentrancy Attacks
Description:
A reentrancy attack occurs when a contract makes an external call to an untrusted contract before updating its own state. If the external contract is malicious, it can re-enter the vulnerable function before the state change is complete, allowing the attacker to drain funds multiple times.
Example Scenario:
A withdraw() function sends ETH to a user via call.value() but updates the balances[msg.sender] after the send. An attacker contract can repeatedly call withdraw() within the callback, draining the vault.
How to Detect:
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Static Analysis Tools: Use tools like Slither or Mythril. Slither specifically flags this with checks like
reentrancy-ethandreentrancy-benign.
bash
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