The mintToken function of a smart contract implementation for GSI, 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.
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
| Link | Tags |
|---|---|
| https://github.com/BlockChainsSecurity/EtherTokens/tree/master/GSI | third party advisory |
| https://github.com/BlockChainsSecurity/EtherTokens/blob/master/GEMCHAIN/mint%20integer%20overflow.md | third party advisory exploit |