User can not receive own assets back

Lines of code Vulnerability details Impact The user has the opportunity to deposit tokens, but does not have the opportunity to withdraw them back. Consequently, his tokens will be locked in the contract and he will not be able to take them back. Yes, the contract is upgradable - but this does no...

Implementation can be self destruct by deployer, effectively break all running sale and lock all assets.

Lines of code Vulnerability details Impact Sale in Escher is deployed using minimal proxy pattern, where there is only 1 implementation contract is deployed to save deployment gas. Also, in Open Edition and FixedPrice sale, when sale is not started yet, owner can cancel it, self destruct the prox...