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Challenge: Can you identify what is wrong with this simple Solidity guessing game contract that makes it easy to cheat? (lemmy.ml)

submitted 1 year ago by [email protected] to c/[email protected]

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[–] Lixen 1 points 1 year ago* (last edited 1 year ago) (1 children)

For those that want to have an actual go at it: when deploying it with hardhat for example, you can pass in Math.floor(Math.random()*1000) as the constructor argument in the deploy script, and then see if you can derive the number on the first guess.

[–] [email protected] 1 points 1 year ago (1 children)

The formula will return a specific result of uint256 type which will be used in constructor on deployment, right? 😉

[–] Lixen 1 points 1 year ago

Yeah, this way you don't know what the number is until you actually figure out the vulnerability.