DatingDapp

Summary

In the MultiSigWallet contract, the executeTransaction() function does not verify whether the contract has sufficient balance to execute the transaction. This can result in failed transactions, wasting gas fees.

Vulnerability Details

When executing a transaction in executeTransaction(), there is no check to confirm that the contract's balance is enough to cover the transaction value. As a result, if the contract does not have enough ETH, the transaction will fail, but the gas spent on the transaction will still be consumed.

Impact

• Users may lose gas fees due to failed transactions.

• Contract execution may fail unpredictably if there isn't enough balance, which can cause a poor user experience.

• Increased risk of unintentional errors if there are multiple pending transactions.

Tools Used

• Manual code review

• Static analysis tools

Recommendations

1. Add a balance check to the executeTransaction() function to ensure that the contract has enough ETH before attempting the transaction:

   require(address(this).balance >= txn.value, "Insufficient contract balance");

2. After adding the balance check, re-test the contract to verify that transactions are executed successfully only when the contract has enough funds to complete them.