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code-423n4 / 2021-09-wildcredit-findings

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Only accept ETH from WETH contract #103

Open code423n4 opened 2 years ago

code423n4 commented 2 years ago

Handle

pauliax

Vulnerability details

Impact

Contract LendingPair has an empty receive function that allows it to receive Ether. I suppose this was needed to receive ETH when withdrawing from WETH. As there is no way to send out accidentally sent ETH from this contract, I suggest adding an auth check to this receive function to only accept ETH from the WETH contract:

Recommended Mitigation Steps

require(msg.sender == address(WETH), "Not WETH");

talegift commented 2 years ago

Suggest lowering severity to 0 as it doesn't allow anyone to steal any funds. It's the same as (an intentional) lack of rescueToken function to rescue any accidentally sent token to the contract.

ghoul-sol commented 2 years ago

best practice recommendation, non-critical