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code-423n4 / 2022-06-putty-findings

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Unchecked transfer #427

Closed code423n4 closed 2 years ago

code423n4 commented 2 years ago

Lines of code

https://github.com/code-423n4/2022-06-putty/blob/main/contracts/src/PuttyV2.sol#L336

Vulnerability details

Description

The return value of an external transfer/transferFrom call is not checked

Impact

There are some tokens that do not revert on failure but return false instead, if such token is used, the return value won't be checked and the function won't revert even if the transfer fails. Therefore it is recommended to ensure the return value of transfer is checked.

Link to code

https://github.com/code-423n4/2022-06-putty/blob/main/contracts/src/PuttyV2.sol#L336

Tools Used

Slither

Recommended Mitigation Steps

Use SafeERC20, or ensure that the transfer/transferFrom return value is checked.

berndartmueller commented 2 years ago

As only WETH (wrapped ETH) is transferred and WETH is a known ERC-20 token contract, there is no need for safeTransfer.

outdoteth commented 2 years ago

echo what @berndartmueller said