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Ethernaut Challenge 11

In this challenge the user is provided with a contract called Elevator.sol. The goal of this challenge is to set the variable top to true.

Solution

  • Create a contract Top.sol that has a function called isLastFloor() as it is what is expected by the Elevator contract.
  • The function is called twice, at first call to isLastFloor() it sets the floor variable to our floor value. We return false here.
  • Based on the floor value we can on the second call to isLastFloor() we return true.
  1. Run Exploit!
forge test -vv -m test_challenge_11