CTF Writeups

Solving SherlockCTF

Feb 25, 2022 · 28 min read · Remix Solidity Hardhat ·

SherlockCTF was a collaborative CTF organized by Sherlock and Secureum, for the top 32 participants in february's RACE event. Each participant submitted a CTF level, and for 7 days, the competition was opened. I managed to score 32 points.

Solving DamnVulnerableDeFi - Part 1 - Levels 1 to 4

Jan 1, 2022 · 11 min read · Hardhat Solidity ·

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First part of the solutions/exploits for the Most Vulnerable DeFi (tm) out there.

Solving Ethernaut - Part 5 - Levels 21 to 25

Nov 15, 2021 · 21 min read · Remix Solidity ·

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Fifth (and last?) part of the solutions to Ethernaut. The challenges in this part are mostly vulnerabilities on more complex contracts, that mimic real exploits.

Solving Ethernaut - Part 4 - Levels 16 to 20

Nov 15, 2021 · 15 min read · Remix Solidity ·

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Fourth part of the solutions to Ethernaut. This time the challenges get harder and more interesting.

Solving Ethernaut - Part 3 - Levels 11 to 15

Nov 15, 2021 · 11 min read · Remix Solidity ·

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Third part of the solutions to Ethernaut. More fun levels, and a little bit harder than before.

Solving Ethernaut - Part 2 - Levels 6 to 10

Nov 15, 2021 · 11 min read · Remix Solidity ·

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Second part of the solutions to Ethernaut. Levels start to get progressively harder, and a lot more interesting to solve and learn.

Solving Ethernaut - Part 1 - Levels 0 to 5

Nov 15, 2021 · 11 min read · Remix Solidity ·

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Another Solidity and Ethereum security CTF game. This time we will be solving Ethernaut, the game hosted by OpenZeppelin.

Solving CaptureTheEther - Part 5 of 5 - Miscellaneous

Nov 10, 2021 · 6 min read · Solidity Python Remix ·

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This last category of challenges is a mix of various types of vulnerabilities that don't really fit into any of the other categories.

Solving CaptureTheEther - Part 4 of 5 - Accounts

Nov 10, 2021 · 11 min read · Solidity Remix ·

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These challenges are meant to teach about the fine details of EVM-compatible networks accounts, contract deployment and cryptographic key pairs.

Solving CaptureTheEther - Part 3 of 5 - Math

Nov 10, 2021 · 19 min read · Solidity Remix ·

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Third post for the CaptureTheEther CTF writeups. Now the focus is on mathematical functions.