Forgetting to delete approval can help attacker mint any legendary gobbler with 0 cost of standard gobblers

Lines of code Vulnerability details 2022-09-artgobblers Forgetting to delete approval can help attacker mint any legendary gobbler with 0 cost of standard gobblers. tags: c4, 2022-09-artgobblers, high Affected code Impact When mint new lengendary gobbler, an amount of standard gobblers cost must ...

Users can recover already burned gobblers after minting a legendary gobbler.

Lines of code Vulnerability details Impact Users can recover already burned gobblers after minting a legendary gobbler. The main flaw is that it doesn't reset getApprovedid here. As a result, users can have more emissionMultiple than they should by recovering the burned gobblers. Proof of Concept...

User Might End Up Losing Preferred Gobblers to mint Legendary Gobbler

Lines of code Vulnerability details Impact mintLegendaryGobbler function of ArtGobblers.sol contract doesn't check whether user input parameter of gobblerIds is equal or more than the cost of legendary gobbler. It only check whether it is less than or not. Therefore it is possible for user to inp...

Users can mint legendary gobbler without losing any gobblers

Lines of code Vulnerability details Impact In ArtGobblers.mintLegendaryGobbler function, it mints a legendary gobbler by burning multiple standard gobblers. But instead of call burn, it just set getGobblerDataid.owner = address0. All the data of the standard gobbler will stay the same, included...

Mint legendary gobbler for free

Lines of code Vulnerability details Impact Minting a legendary gobbler does not delete getApproved, thus an owner can approve himself before minting the legendary and later transfer back these ordinary gobblers. mintLegendaryGobbler performs an imitation of burning by setting an owner to address0...