A security flaw in the 'owned' function of a smart contract implementation for RobotCoin (RBTC), a tradeable Ethereum ERC20 token, allows attackers to hijack victim accounts and arbitrarily increase the digital supply of assets.

The mintToken function of a smart contract implementation for RobotBTC, an Ethereum token, has an integer overflow that allows the owner of the contract to set the balance of an arbitrary user to any value.