Blockhash Vulnerability in HashHeroes Tiles Smart Contract Implementation

CVE-2018-17987 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:P/A:N

The determineWinner function of a smart contract implementation for HashHeroes Tiles, an Ethereum game, uses a certain blockhash value in an attempt to generate a random number for the case where NUM_TILES equals the number of people who purchased a tile, which allows an attacker to control the awarding of the prize by being the last person to purchase a tile.

Learn more about our Web Application Penetration Testing UK.