Submission Details
Severity:
Should follow pull over push pattern when sending tokens. If any of `sender`,`receiver`,`arbiter` is blacklisted then `confirmReceipt()` or `resolveDispute()` might be DoSed.
Summary
confirmReceipt() or resolveDispute will release amount owed to seller,buyer,arbiter.
If any of the transfer fails, e.g USDC blacklisting, a whole transaction will revert.
Vulnerability Details
function confirmReceipt() external onlyBuyer inState(State.Created) {
s_state = State.Confirmed;
emit Confirmed(i_seller);
i_tokenContract.safeTransfer(i_seller, i_tokenContract.balanceOf(address(this))); //@audit - pull over push
}
function resolveDispute(uint256 buyerAward) external onlyArbiter nonReentrant inState(State.Disputed) {
uint256 tokenBalance = i_tokenContract.balanceOf(address(this));
uint256 totalFee = buyerAward + i_arbiterFee; // Reverts on overflow
if (totalFee > tokenBalance) {
revert Escrow__TotalFeeExceedsBalance(tokenBalance, totalFee);
}
s_state = State.Resolved;
emit Resolved(i_buyer, i_seller);
if (buyerAward > 0) {
i_tokenContract.safeTransfer(i_buyer, buyerAward); //@audit - pull over push
}
if (i_arbiterFee > 0) {
i_tokenContract.safeTransfer(i_arbiter, i_arbiterFee); //@audit - pull over push
}
tokenBalance = i_tokenContract.balanceOf(address(this)); //@audit - pull over push
if (tokenBalance > 0) {
i_tokenContract.safeTransfer(i_seller, tokenBalance);
}
Impact
confirmReceipt() or resolveDispute will be DoSed if any of the seller,buyer,arbiter is blacklisted.
Tools Used
Manual Review
Recommendations
Should have claim() function where buyer, seller, arbiter would be able to withdraw their claims.
+ mapping(address => uint256) public claimable;
+ function claim() external {
+ uint256 amount = claimable[msg.sender];
+ if (amount > 0)
+ {
+ delete claimable[msg.sender];
+ i_tokenContract.safeTransfer(msg.sender, amount);
+ }
+ }
function confirmReceipt() external onlyBuyer inState(State.Created) {
s_state = State.Confirmed;
emit Confirmed(i_seller);
- i_tokenContract.safeTransfer(i_seller, i_tokenContract.balanceOf(address(this))); //@audit - pull over push
+ claimable[i_seller] = price;
}
function resolveDispute(uint256 buyerAward) external onlyArbiter nonReentrant inState(State.Disputed) {
uint256 tokenBalance = i_tokenContract.balanceOf(address(this));
uint256 totalFee = buyerAward + i_arbiterFee; // Reverts on overflow
if (totalFee > tokenBalance) {
revert Escrow__TotalFeeExceedsBalance(tokenBalance, totalFee);
}
s_state = State.Resolved;
emit Resolved(i_buyer, i_seller);
- if (buyerAward > 0) {
- i_tokenContract.safeTransfer(i_buyer, buyerAward); //@audit - pull over push
- }
- if (i_arbiterFee > 0) {
- i_tokenContract.safeTransfer(i_arbiter, i_arbiterFee); //@audit - pull over push
- }
- tokenBalance = i_tokenContract.balanceOf(address(this));
- if (tokenBalance > 0) {
- i_tokenContract.safeTransfer(i_seller, tokenBalance); //@audit - pull over push
- }
+ claimable[i_seller] = price - totalFee;
+ claimable[i_buyer] = buyerAward;
+ claimable[i_arbiter] = i_arbiterFee;
Prize pool breakdown
Total prize
40,000 USDC
nSLOC
186215 USDC / LOC
37,000 USDC
3,000 USDC
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