Here are three of the most common and damaging DeFi smart contract vulnerabilities, along with specific methods to detect them.
1. Reentrancy Attacks
Description:
A reentrancy attack occurs when a smart contract sends an external call to another contract (or itself) before completing its internal state changes. If the external call triggers a callback function in the vulnerable contract, an attacker can recursively invoke the function, repeatedly draining funds before the state is updated to reflect the first withdrawal.
Specific Detection Methods:
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Static Analysis for State-Call-Order Violations: Use tools like Slither or Mythril to check for the "checks-effects-interactions" pattern. The rule is: 1) Check conditions, 2) Update internal state, 3) Make external calls. If an external call (e.g.,
msg.sender.call{value: amount}("")) occurs before a state variable (e.g., `balances[msg
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