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Damn Vulnerable DeFi v4 – Challenge 1: Unstoppable Solution
In this video, we’re solving Challenge 1 – Unstoppable from Damn Vulnerable DeFi v4!
Learn how to halt the UnstoppableVault by exploiting a simple logic flaw. This is a beginner-friendly smart contract hacking tutorial where we break down:
✅ The vulnerability in the UnstoppableVault contract
✅ How invariants work and why breaking them can halt a protocol
✅ A step-by-step exploit walkthrough with Solidity code using Foundry
💡 Want to Become a Smart Contract Security Researcher?
If this challenge feels too advanced or if you’re spending too much time searching for answers across the internet, check out my Smart Contract Hacking Course!
🎯 What You Get in the Course:
✅ Hands-on, practical hacking exercises
✅ Step-by-step guidance (no more scattered resources!)
✅ Private Discord community for support
✅ Certificate of completion to showcase your skills
👉 Start Your Smart Contract Hacking Journey Today: https://smartcontractshacking.com/
📌 Timestamps:
00:00 – Intro to Damn Vulnerable DeFi v4 Challenge 1
01:30 – Understanding the UnstoppableVault Contract
03:45 – Finding the Vulnerability
06:00 – Writing the Exploit (Solidity Code)
08:15 – Running the Attack & Breaking the Vault
10:00 – Smart Contract Hacking Course (Learn More!)
🔗 Resources:
Fall Damn Vulnerable DeFi V4 Solutions Playlist: https://www.youtube.com/playlist?list=PLKXasCp8iWphenTK2xJSblOD1n4Ute_it
Damn Vulnerable DeFi V4 Solutions Repo (Watch and leave a star ⭐): https://github.com/RealJohnnyTime/damn-vulnerable-defi-v4-solutions
Damn Vulnerable DeFi V4 website: https://www.damnvulnerabledefi.xyz/
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👍 Like, comment, and let me know what other DVT v4 challenges you want me to cover!
#DamnVulnerableDeFi #DVTv4 #SmartContractHacking #Solidity #BlockchainSecurity #Unstoppable #DamnVulnerableDeFiSolutions #DeFiHacking #Web3Security
date : 2025-03-11 10:45:00
views : 348
likes : 20
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Summary:
The speaker, Johnny, is a Web3 DeFi tech editor and hacker, and in this video, he’s solving the first challenge in the "Damn Vulnerable DeFi V4 (Foundry) Unstoppable" series using the Foundry framework. The challenge is about a tokenized vault that offers flash loans, but the developer has implemented a monitoring contract to check the liveness of the flash loan feature. The goal is to hold the vault and prevent it from offering flash loans.
The contract, "Unstoppable Vault," has a "flashLoans" function that allows anyone to request a flash loan. Johnny examines the function and identifies the conditional statement that checks the equality of the total supply and the balance before processing the request. He discovers that by sending tokens to the vault, he can create an accounting discrepancy and make the function revert, effectively preventing anyone from requesting flash loans.
The solution is simple: Johnny sends one HD VT token to the vault, which creates a discrepancy between the balance and the total supply, causing the function to revert. He then runs the tests using Forge and finds that all the tests pass, indicating that the challenge is solved.
Interesting Web3 Facts:
- Web3 is a decentralized web, built on blockchain technology, where users have control over their data and transactions.
- DeFi (Decentralized Finance) is a subset of Web3 that focuses on financial services like lending, borrowing, and trading, all without intermediaries.
- Foundry is a development framework for smart contracts that enables the creation of decentralized applications (dApps).
- "Damn Vulnerable DeFi V4" is a collection of challenges designed to test the security of DeFi smart contracts.
