Stratax Contracts
First Flight #57
Beginner FriendlyDeFi
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Submission Details
Impact: low
Likelihood: low

Flash Loan Callback Lacks Reentrancy Guard

Author Revealed upon completion

Flash Loan Callback Lacks Reentrancy Guard

Description

  • executeOperation is the Aave flash loan callback and performs multiple external calls (repay, withdraw, 1inch swap, supply).

  • The 1inch swap uses a low-level call that can execute arbitrary code. There is no nonReentrant modifier on executeOperation.

  • While the contract has no obvious callback that would benefit an attacker, defense-in-depth is missing.

function executeOperation(
address _asset,
uint256 _amount,
uint256 _premium,
address _initiator,
bytes calldata _params
@> ) external returns (bool) {
require(msg.sender == address(aavePool), "Caller must be Aave Pool");
require(_initiator == address(this), "Initiator must be this contract");
// ...
} else {
return _executeUnwindOperation(_asset, _amount, _premium, _params);
}
}

Risk

Likelihood (low):

  • 1inch swap paths would need to callback into this contract.

  • The contract has no receive() or useful callback; reentrancy paths are limited.

Impact (low):

  • If a callback path existed, reentrancy could lead to unexpected behavior or fund loss.

Severity (low):

Proof of Concept

  • 1inch router executes swap; DEX in the path calls back to our contract. Without nonReentrant, that callback could re-enter before state is finalized. Current design has no useful callback, so exploit path is unclear.

Recommended Mitigation

+ import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
​
- contract Stratax is Initializable {
+ contract Stratax is Initializable, ReentrancyGuard {
​
function executeOperation(...)
+ nonReentrant
external returns (bool) {

Note: If the contract is upgradeable, ensure ReentrancyGuard storage is compatible with the upgrade pattern.

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