Inheritable Smart Contract Wallet
First Flight #35
Beginner FriendlySolidity
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Submission Details
Severity: high
Invalid

Use `EnumerableSet` instead of array.

gunboats

Summary

Use EnumerableSet instead for storing benefitancies to fix multiple problem.

Vulnerability Details

  1. removeBenefitancy is wrong if you called with address not in the benefitancies, as it will set the first address into address zero and not removing address.

  2. Address inbenefitancies can be duplicated.

  3. A address in later index of benefitancies will have a higher gas cost from interacting with the contract.

Impact

A first benefitancy will lose access to fund and split calculation will be wrong. Gas can be problematic with high amount of benefitancies.

Tools Used

Foundry

Recommendations

Use OpenZeppelin's EnumerableSet instead of having a benefitancies array. As it has O(1) for read for onlyBeneficiaryWithIsInherited and a function for add and remove benefitancies correctly

import {EnumerableSet} from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol"
​
contract InheritanceManager {
using EnumerableSet for EnumerableSet.AddressSet;
EnumerableSet.AddressSet benefitancies;
.....
modifier onlyBeneficiaryWithIsInherited() {
if(!benefitancies.contains(msg.sender) && isInherited) {
revert();
}
_;
}
​
function addBeneficiery(address _beneficiary) external onlyOwner {
require(_beneficiary != address(0));
beneficiaries.add(_beneficiary);
_setDeadline();
}
​
function removeBeneficiary(address _beneficiary) external onlyOwner {
require(benefitancies.remove(_beneficiary));
}
// view function
function beneficiariesLength() external view returns (uint256) {
return benficiaries.length();
}
​
function beneficiaries() external view returns (address[]) {
return benficiaries.values();
}
​
function beneficiariesByIndex(uint256 _index) external view returns (address) {
return benficiaries.at(_index);
}
​
function IsBeneficiaries(address _candidate) external view returns (bool) {
return beneficiaries.contains(_candidate);
}
}
Updates

Lead Judging Commences

0xtimefliez Lead Judge 9 months ago
Submission Judgement Published
Invalidated
Reason: Design choice

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