GivingThanks

Root Cause and Impact

• Root Cause: The contract can receive Ether but lacks a function to withdraw it, resulting in Ether being permanently locked.

• Impact: Any Ether sent directly to the contract (e.g., via selfdestruct or mistaken transfers) cannot be recovered.

Vulnerability Details

• Absence of Withdrawal Function:

  • No function allows the contract owner to withdraw Ether.

  • Ether sent to the contract remains inaccessible.

Recommendations

• Implement a Withdrawal Function:

  function withdraw() external onlyOwner {

  uint256 balance = address(this).balance;

  require(balance > 0, "No Ether to withdraw");

  payable(owner).transfer(balance);

  }

• Prevent Direct Ether Transfers:

  • Implement a fallback function that reverts any direct Ether transfers:

    receive() external payable {

    revert("Direct transfers not allowed");

    }