Pieces Protocol
First Flight #32
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100 EXP
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Submission Details
Severity: low
Invalid

The TokenDivider::transferErcTokens does not validate whether the caller has approved the contract to transfer

freesultan

Summary

If the contract does not have the necessary allowance, the transferFrom call will fail. This can lead to failed transactions.

Vulnerability Details

In the transferErcTokens function, the contract attempts to transfer ERC20 tokens from the caller (msg.sender) to another address (to). However, the function does not validate whether the caller has approved the contract to transfer the specified amount of tokens on their behalf.

​
function transferErcTokens(address nftAddress,address to, uint256 amount) external {
if(nftAddress == address(0)) {
revert TokenDivider__NftAddressIsZero();
}
​
if(to == address(0)) {
revert TokenDivider__CantTransferToAddressZero();
}
​
if(amount == 0) {
revert TokenDivider__AmountCantBeZero();
}
​
ERC20Info memory tokenInfo = nftToErc20Info[nftAddress];
​
if(to == address(0)) {
revert TokenDivider__CantTransferToAddressZero();
}
if(balances[msg.sender][tokenInfo.erc20Address] < amount) {
revert TokenDivider__NotEnoughErc20Balance();
}
​
balances[msg.sender][tokenInfo.erc20Address] -= amount;
balances[to][tokenInfo.erc20Address] += amount;
​
emit TokensTransfered(amount, tokenInfo.erc20Address);
IERC20(tokenInfo.erc20Address).transferFrom(msg.sender,to, amount);
}

Impact

If the caller has not provided the necessary allowance for the contract to transfer their tokens, the call to transferFrom will fail

Tools Used

Manual Code Review

Recommendations

Ensure that the contract has sufficient approval to transfer the tokens from the sender

​
+ uint256 allowance = IERC20(tokenInfo.erc20Address).allowance(msg.sender, address(this));
+ if (allowance < amount) {
+ revert TokenDivider__InsufficientAllowance();
+ }
​
Updates

Lead Judging Commences

fishy Lead Judge 5 months ago
Submission Judgement Published
Invalidated
Reason: Incorrect statement

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