Here are three common DeFi smart contract vulnerabilities, along with specific detection methods. These are based on real-world exploits and industry-standard security practices.
1. Reentrancy Vulnerability
Description:
Reentrancy occurs when a contract calls an external contract (e.g., sending ETH or ERC-20 tokens) before updating its internal state. An attacker can exploit this by recursively calling the vulnerable function before the state change is complete, draining funds repeatedly.
Example:
A withdraw() function sends ETH to the user before updating the user’s balance in the mapping. The attacker’s fallback function triggers another withdraw() call while the balance is still considered positive.
How to Detect:
-
Static Analysis Tools: Use tools like Slither or Mythril. Slither has a specific detector for reentrancy (
reentrancy-eth,reentrancy-benign).- Command: `
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