@0xJuancito Profile picture

juancito

@0xJuancito

🕵️‍♂️ Smart Contracts Auditor ⚔️ Validator @code4rena 🏹 Hunter @immunefi 🧪 Security Researcher

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⚒️ I've just created a repository with observations and tips for auditing Solidity protocols on multiple EVM chains. It has examples and references from Ethereum, Optimism, Arbitrum, Polygon, BSC, zkSync Era and more. Let me know what you think! ❤️ github.com/0xJuancito/mul…


Nice Uni v3 integration issue! I've found a similar one some months ago You can easily alter the price of a v3 pool that has no liquidity, via a swap You can then even add single-sided liquidity to prevent anyone from correcting the price github.com/code-423n4/202…

How ✨I found a critical vulnerability✨ in @zora's ERC20Z contract via a little known Uniswap v3/v4 property When Zora put out this article: zora.co/writings/oncha… outlining their new protocol, I was intrigued and had to learn more From a high level, the system works by…

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juancito Reposted

So basically - iszero(protocol) will always return false because string is a dynamic type so it ends up evaluating the pointer which will never be zero. - not() will always return true for 1 and 0 because it's a bitwise not operator, not a boolean not operator.


juancito Reposted

Biggest mistake I see junior security researchers do is chase the new shiny tech, they get nerdsniped Best strategy for growth as an auditor in most cases is to fully focus on one thing at a time and be great at it, one example is just Solidity DeFi codebases✌️


juancito Reposted

I just spent the past >month diving deep into Cairo 0 Here's everything I wish I knew before I started: necessary background, language setup and the best security resources out of the Cairo 0 ecosystem 🧵 Spoiler: they did their homework


juancito Reposted

I don't think I ever announced it, but @flexybridge is now a public good. Bridging is completely free for everyone. Help us spread the word if you feel called. Cheers 🍻


Here’s another small audit we did some time ago. It was an update with a small attack surface given some trusted actors, and good written code, so no major risks. Still managed to find some things to improve ✌️

Another security audit report published for @build_on_bob✌️ A tiny, quick, 3 days audit, but we still put in our best efforts into it. More security to come. Read the report below👇 github.com/pashov/audits/…



juancito Reposted

Are you building a cross-chain protocol on top of @hyperlane? Here is a security checklist that might come in handy. If you find the checklist useful. ❤️❤️❤️ Like and retweet to spread visibility. ⬇️⬇️⬇️


This was an audit we did some months ago and contains many cross-chain issues. Some in particular are related to the LayerZero integration: C-01, C-03, H-03, H-04, M-01, M-11, M-12, L-10

An audit report back from June was just published. This one had our auditors working extra hard, finding 15 Critical/High and 15 Medium severity vulnerabilities. Subsequent audit for the protocol was required🫡 Read the report below👇 github.com/pashov/audits/…



juancito Reposted

PoC of @lavalending exploit Lost: 1 USDC, 125795.6 cUSDC, 0,0067 WBTC, 2.25 WETH (~$130K USD) The attacker used: 5 Flash loans + price manipulation The twitter and telegram acc were deleted, the web is still up Tanks @0xNickLFranklin for the alert github.com/SunWeb3Sec/DeF…


juancito Reposted

PoC of @OnyxDAO exploit: github.com/SunWeb3Sec/DeF… 4.1M VUSD, 7.35M XCN, 5K DAI, 0.23 WBTC, 50K USDT (>$3.8M USD) This time was not EZ so far the most difficult to replicate The attacker used: Flash loan + price manipulation + fake market 5 contracts in total


juancito Reposted

PoC of @Bedrock_DeFi exploit 27.83925883 BTC (>$1.7M USD) This time was an EZ exploit I made two PoC: - Minimal: github.com/SunWeb3Sec/DeF… - And also a copy of the attacker tx Thanks @BeosinAlert and @CertiKAlert for the alerts


juancito Reposted

Uniswap Hook Incubator finalists @mevquant @Seecoalba @TheBlockChainer casually dropping a new uniswap math primer for hook blders everywhere at the end of their demo today github.com/scab24/univ4-r…


Damn this game is tough. I said I’d take the weekend to relax but I found myself trying to beat this one to 100% 😁


juancito Reposted

Preview of the @CompoundFinance governance attack:


juancito Reposted

I have 0 PhDs and 7 ZK bug bounties 🤷‍♂️ Don’t let people convince you you can’t learn things.


juancito Reposted

waaaat you can decode and trace internal function calls with Foundry! I'd totally missed this

Have you already tried the --decode-internal flag? You can now also generate flamegraphs using it 😀 github.com/foundry-rs/fou…

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This is my personal best chess performance of all time. Auditing helped in critical thinking perhaps? 😁

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