Here are three of the most prevalent DeFi smart contract vulnerabilities, along with specific methods for detecting them during code auditing or development.
1. Reentrancy Attacks
What it is:
Reentrancy occurs when a contract calls an external contract (e.g., another token contract or a user-controlled wallet) and the external contract calls back into the vulnerable function before the first call has completed. This allows an attacker to repeatedly execute the same logic (e.g., withdrawing funds) before the state variables (like balances) are updated.
How to Detect It:
-
Identify External Calls: Scan for all functions that use
.call(),.send(), or.transfer()to external addresses. These are potential reentrancy points. -
Check State Updates After External Calls: Look for patterns where state variables (e.g.,
balances[address]) are modified after an external call. The standard mitigation is the **CE
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