Ethernaut CTF - Shop (Level 21)
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In this CTF series, we’re going to learn more about the practical side of smart contract auditing and security.
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Additional Resources
Ethernaut CTF - https://ethernaut.openzeppelin.com/
Eshan solution (old) - / ethernaut-lvl-21-shop-walkthrough-how-to-u...
ThisPost solution (old) - / ethernaut-21-shop-writeups
Reasoning for updating challenge - https://github.com/OpenZeppelin/ether...
Coder-question solution (old) - https://coder-question.com/cq-blog/52...
R1oga solution (new) - https://github.com/r1oga/ethernaut#ta...
Ternary operator (JS) - https://developer.mozilla.org/en-US/d...
Conditional operator (Solidity docs) - https://docs.soliditylang.org/en/late...
Timeline
00:00 - Intro to challenge
01:24 - Code review (target)
04:35 - Different solutions
08:55 - Code review (attack)
10:57 - Ternary operators
12:45 - Solving challenge
14:05 - Outro