An integer overflow in the transferMulti function of a smart contract implementation for KoreaShow, an Ethereum ERC20 token, allows attackers to accomplish an unauthorized increase of digital assets via crafted _value parameters.
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.
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| http://openwall.com/lists/oss-security/2018/05/10/2 | mailing list third party advisory exploit |