Protocol fees can be withdrawn multiple times in Erc20Quest

Lines of code Vulnerability details The withdrawFee function present in the Erc20Quest contract can be used to withdraw protocol fees after a quest has ended, which are sent to the protocol fee recipient address: function withdrawFee public onlyAdminWithdrawAfterEnd...

User's claim can revert when attackers call withdrawFee several times

Lines of code Vulnerability details Impact withdrawFee can be called several times, so attackers can use this to drain Erc20Quest's balance. Proof of Concept When the admin calls withdrawRemainingTokens, protocolFee + unclaimedTokens left in the Erc20Quest contract. If unclaimedTokens =...

withdrawFee() can be called multiple times by any user when quest has ended making it possible to drain contract and leave users unable to claim rewards

Lines of code Vulnerability details Impact The withdrawFee function in the Erc20Quest contract can be called multiple times. The modifier onlyAdminWithdrawAfterEnd is applied to the function which only makes it possible to call it after the end time of a quest. It should be noted that any user is...