Reality Cards contest - 0xImpostor's results

Handle

0xImpostor

Vulnerability details

Impact

When the current owner of the card is still the new owner of the card, transferCard is called before the treasury is updated. While this does not currently pose a risk, it is not aligned with best practices of check-effect-interations and opens your code to a potential re-entrancy attack in the future.

Tools Used

Manual analysis

Recommended Mitigation Steps

// line 381
treasury.updateRentalRate(
    _oldOwner,
    _user,
    user[_oldOwner][index[_oldOwner][_market][_card]].price,
    _price,
    block.timestamp
);
transferCard(_market, _card, _oldOwner, _user, _price);
...
// line 449
treasury.updateRentalRate(
    _user,
    _user,
    _price,
    _currUser.price,
    block.timestamp
);
transferCard(_market, _card, _user, _user, _currUser.price);