An integer overflow in the transferProxy function of a smart contract implementation for SmartMesh (aka SMT), an Ethereum ERC20 token, allows attackers to accomplish an unauthorized increase of digital assets via crafted _fee and _value parameters, as exploited in the wild in April 2018, aka the "proxyOverflow" issue.
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://peckshield.com/2018/04/25/proxyOverflow/ | third party advisory exploit |
| https://www.reddit.com/r/ethereum/comments/8esyg9/okex_erc20_bug/ | third party advisory exploit |
| https://dasp.co/#item-3 | not applicable |