Here are three specific DeFi smart contract vulnerabilities, described in a format suitable for an audit report. Each entry includes the vulnerability class, technical mechanism, impact, and a recommended mitigation.
1. Reentrancy in Price Oracle Updates (Flash Loan Attack Vector)
Vulnerability Class: Reentrancy / Oracle Manipulation
Severity: High
Affected Component: PriceFeed or LiquidationModule
Description
The smart contract relies on a single on-chain price oracle (e.g., Chainlink) for collateral valuation during liquidation or borrowing. However, the oracle update function is callable by any external account, and the contract does not enforce a minimum time delay or deviation threshold before accepting a new price.
Technical Mechanism
- An attacker initiates a flash loan to obtain a large amount of the collateral asset.
- The attacker calls the oracle’s
updatePrice()function with a manipulated price (e.g
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