ERC20.sol is susceptible to classic ERC20 approve functionality front-running exploit

Lines of code Vulnerability details Proof of concept The problem is perfectly described here The tldr; is that if you approved a person to spend 100 tokens and then you want to decrease his allowance to 50, if he spends his 100 tokens allowance before you set his allowance to 50 he will be able t...

Note: When _initialSupply ! = 0, the _mint_to_Accountant function will fail

Lines of code Vulnerability details Impact In Note contract, if initialSupply ! = 0, totalSupply will overflow when the minttoAccountant function executes mintmsg.sender, typeuint.max constructorstring memory name, string memory symbol, uint256 totalSupply public name = name; symbol = symbol;...