https://github.com/code-423n4/2022-06-nested/blob/b4a153c943d54755711a2f7b80cbbf3a5bb49d76/contracts/governance/OwnerProxy.sol#L20
The Withdrawer contract has a function withdraw() which calls an unsafe transferFrom(). A call to transferFrom is frequently done without checking the results.
For certain ERC20 tokens, if insufficient tokens are present, no revert occurs but a result of false is returned.
As explained in https://consensys.net/diligence/audits/2021/01/fei-protocol/#unchecked-return-value-for-iweth-transfer-call
And in this function case, if the weth.transferFrom() returns false, it would continue the call to withdraw token from the contract and send it to the caller. Thus a user could withdraw free tokens, and eventually some users will be unable to withdraw their tokens.
https://github.com/code-423n4/2022-06-nested/blob/main/contracts/Withdrawer.sol#L26
YearnCurveVaultOperator contract in
https://github.com/code-423n4/2022-06-nested/blob/main/contracts/operators/Yearn/YearnCurveVaultOperator.sol#L81
Check the result of transferFrom and transfer. Or making use of SafeERC20 library: safeTransfer and safeTransferFrom would be recommended.
