ctfwriteup
  • ✅/home/ret2basic.eth
  • Game Hacking
    • 👑Pwn Adventure 3: Pwnie Island
      • ✅Prep: Speed Hack
      • ✅Prep: Infinite Health and Mana (Offline)
      • ✅Prep: Analyze Network Packets with Wireshark
      • Prep: Build a Proxy in Python
      • ✅Until the Cows Come Home
      • Unbearable Revenge
      • Pirate's Treasure
    • Cheat Engine Tutorial
      • ✅Step 1: Setup
      • ✅Step 2: Scan for "Exact Value"
      • ✅Step 3: Scan for "Unknown initial value"
      • ✅Step 4: Scan for float and double
      • ✅Step 5: Replace instruction
      • Step 6: Pointer scanning
      • Step 7: Code injection
      • Step 8: Multilevel pointers
      • Step 9: Shared code
  • Web3 CTF
    • 👑Remedy CTF 2025 (Todo)
      • Diamond Heist
      • R vs Q
      • Rich Man's Bet
      • Casino Avengers
      • Frozen Voting
      • Lockdown
      • Proof of Thought
      • Maybe it's unnecessary?
      • Et tu, Permit2?
      • Not a very LUCKY TOKEN
      • risc4
      • HealthCheck as a Service
      • Restricted Proxy
      • Unstable Pool
      • Opaze Whisperer
      • "memorable" onlyOwner
      • World of Memecraft
      • Copy/Paste/Deploy
      • Peer-to-peer-to-me
      • Joe's Lending Mirage
      • Tokemak
      • OFAC Executive Order 13337
    • 👑Paradigm CTF 2023 (Todo)
      • Oven
      • Dragon Tyrant
    • Damn Vulnerable DeFi
      • ✅Unstoppable
      • ✅Naive Receiver
      • ✅Truster
      • ✅Side Entrance
      • ✅The Rewarder
      • ✅Selfie
      • ✅Compromised
      • ✅Puppet
      • ✅Puppet V2
      • ✅Free Rider
      • Backdoor
      • Climber
      • Wallet Mining (Todo)
      • Puppet V3 (Todo)
      • ABI Smuggling (Todo)
    • Milotruck Challs
      • ✅Greyhats Dollar
      • Escrow
      • Simple AMM Vault
      • Voting Vault
      • ✅Meta Staking
      • ✅Gnosis Unsafe
    • Secureum AMAZEX DSS Paris
      • ✅Operation magic redemption
      • Mission Modern WETH: Rescue the Ether
      • LendEx pool hack
      • Operation Rescue POSI Token!
      • Balloon Vault
      • Safe Yield?
      • ✅Crystal DAO
      • ✅Liquidatoooor
    • ✅Ethernaut
      • ✅Hello Ethernaut
      • ✅Fallback
      • ✅Fallout
      • ✅Coin Flip
      • ✅Telephone
      • ✅Token
      • ✅Delegation
      • ✅Force
      • ✅Vault
      • ✅King
      • ✅Re-entrancy
      • ✅Elevator
      • ✅Privacy
      • ✅Gatekeeper One
      • ✅Gatekeeper Two
      • ✅Naught Coin
      • ✅Preservation
      • ✅Recovery
      • ✅MagicNumber
      • ✅Alien Codex
      • ✅Denial
      • ✅Shop
      • ✅DEX
      • ✅DEX Two
      • ✅Puzzle Wallet
      • Motorbike
      • DoubleEntryPoint
      • ✅Good Samaritan
      • Gatekeeper Three
      • Switch
    • ✅Flashbots MEV-Share CTF
    • ✅Capture the Ether
      • ✅Lotteries
      • ✅Math
      • ✅Miscellaneous
    • ✅EVM Puzzles
      • ✅Puzzle 1
      • ✅Puzzle 2
      • ✅Puzzle 3
      • ✅Puzzle 4
      • ✅Puzzle 5
      • ✅Puzzle 6
      • ✅Puzzle 7
      • ✅Puzzle 8
      • ✅Puzzle 9
      • ✅Puzzle 10
    • ✅More EVM Puzzles
      • ✅Puzzle 1
      • ✅Puzzle 2
      • ✅Puzzle 3
      • ✅Puzzle 4
      • ✅Puzzle 5
      • ✅Puzzle 6
      • ✅Puzzle 7
      • ✅Puzzle 8
      • ✅Puzzle 9
      • ✅Puzzle 10
    • ✅QuillCTF
      • ✅MetaToken
      • ✅Temporary Variable
      • KeyCraft
      • ✅Lottery
      • ✅Private Club
      • Voting Machine
      • ✅Predictable NFT
      • ✅Invest Pool
      • PseudoRandom
      • ✅Gold NFT
      • Slot Puzzle
      • Moloch's Vault
      • ✅Donate
      • ✅WETH-11
      • Panda Token
      • Gate
      • ✅WETH10
      • ✅Pelusa
      • ✅True XOR
      • ✅Collatz Puzzle
      • ✅D31eg4t3
      • ✅Safe NFT
      • ✅VIP Bank
      • ✅Confidential Hash
      • ✅Road Closed
    • ✅unhacked
      • ✅reaper
  • RareSkills Puzzles
    • Solidity Exercises
    • Solidity Riddles
    • Yul Puzzles
      • ✅01 - ReturnBool
      • ✅02 - SimpleRevert
      • ✅03 - Return42
      • ✅04 - RevertWithError
      • ✅05 - RevertWithSelectorPlusArgs
      • 06 - RevertWithPanic
    • Huff Puzzles
    • Uniswap V2 Puzzles
    • Zero Knowledge Puzzles
  • Web2 CTF
    • Grey Cat CTF 2024
      • ✅Web Challs
    • pwn.college
      • Introduction
        • What is Computer Systems Security?
      • Program Interaction
        • Linux Command Line
        • 🚩embryoio
      • Program Misuse
        • Privilege Escalation
        • Mitigations
        • 🚩babysuid
      • Assembly Refresher
        • x86 Assembly
        • 🚩embryoasm
      • Shellcoding
        • Introduction
        • Common Challenges
        • Data Execution Prevention
        • 🚩babyshell
      • Sandboxing
        • chroot
        • seccomp
        • Escaping seccomp
        • 🚩babyjail
      • Debugging Refresher
        • x86 Assembly
        • 🚩embryogdb
      • Binary Reverse Engineering
        • Functions and Frames
        • Data Access
        • Static Tools
        • Dynamic Tools
        • Real-world Applications
        • 🚩babyrev
      • Memory Errors
        • High-Level Problems
        • Smashing the Stack
        • Causes of Corruption
        • Canary
        • ASLR
        • Causes of Disclosure
        • 🚩babymem
      • Exploitation
        • Introduction
        • Hijacking to Shellcode
        • Side Effects
        • JIT Spray
        • 🚩toddler1
      • Return Oriented Programming
        • Binary Lego
        • Techniques
        • Complications
        • 🚩babyrop
      • Dynamic Allocator Misuse
        • What is the Heap?
        • Dangers of the Heap
        • tcache
        • Chunks and Metadata
        • Metadata Corruption
        • 🚩babyheap
      • Race Conditions
        • Introduction
        • Races in the Filesystem
        • 🚩babyrace
      • Kernel Security
        • Environment Setup
        • Kernel Modules
        • Privilege Escalation
        • 🚩babykernel
      • Advanced Exploitation
        • toddler2
    • pwnable.kr
      • fd
      • collision
      • bof
      • flag
      • passcode
      • random
      • input
      • leg
      • mistake
      • shellshock
      • coin1
      • blackjack
      • lotto
      • cmd1
      • cmd2
      • uaf
      • memcpy
      • asm
      • unlink
      • blukat
      • horcruxes
    • ROP Emporium
      • ret2win
      • split
      • callme
      • write4
      • pivot
    • ✅Jarvis OJ Pwn Xman Series
    • ✅Jarvis OJ Crypto RSA Series
    • ✅picoMini by redpwn
      • Binary Exploitation
      • Reverse Engineering
      • Cryptography
      • Web Exploitation
      • Forensics
    • ✅picoCTF 2021
      • Reverse Engineering
      • Web Exploitation
      • Forensics
    • ✅picoCTF 2020 Mini-Competition
  • Red Teaming
    • vulnlab
      • Active Directory Chains
        • ✅Trusted (Easy)
        • Hybrid (Easy)
        • Lustrous (Medium)
        • Reflection (Medium)
        • Intercept (Hard)
      • Red Team Labs
        • Wutai (Medium)
        • Shinra (Hard)
    • Hack The Box
      • AD
        • Intelligence
        • Pivotapi
        • Sharp
        • Monteverde
        • Resolute
        • Endgame: P.O.O.
        • Forest
        • Sauna
        • Active
        • Blackfield
      • ✅Linux
        • ✅Safe (Easy)
        • ✅Delivery (Easy)
        • ✅TheNotebook (Medium)
        • ✅Brainfuck (Insane)
    • TCM Windows Privilege Escalation Course
      • ✅Hack The Box - Chatterbox (Medium)
      • Hack The Box - SecNotes (Medium)
    • ✅TCM Linux Privilege Escalation Course
      • ✅TryHackMe - Simple CTF (Easy)
      • ✅TryHackMe - Vulnversity (Easy)
      • ✅TryHackMe - CMesS (Medium)
      • ✅TryHackMe - UltraTech (Medium)
      • ✅TryHackMe - LazyAdmin (Easy)
      • ✅TryHackMe - Anonymous (Medium)
      • ✅TryHackMe - tomghost (Easy)
      • ✅TryHackMe - ConvertMyVideo (Medium)
      • ✅TryHackMe - Brainpan 1 (Hard)
Powered by GitBook
On this page
  • Objective
  • Writeup
  • PoC
  1. Web3 CTF
  2. Secureum AMAZEX DSS Paris

Mission Modern WETH: Rescue the Ether

PreviousOperation magic redemptionNextLendEx pool hack

Last updated 1 year ago

Objective

In the ever-evolving world of decentralized finance, an ambitious developer took it upon himself to update the well-established WETH9. The result was ModernWETH, a modernized version in Solidity, that rapidly attracted deposits of over 1000 Ether.

However, we've encountered a challenge. Hidden within the code, a potential vulnerability threatens the security of the funds locked within the contract. This situation calls for the dedication and expertise of blockchain security auditors. Are you ready to step up, solve this issue, and play a crucial role in preserving the sanctity of the Ethereum ecosystem? This is the test of our resolve and adaptability, something I've seen in this community time and again.

📌 Starting with 10 ETH, recover 1000 ETH from the ModernWETH contract.

📌 Recover all ETH to avoid further losses from ModernWETH contract. Whitehat hacker should end up with 1010 ETH.

🗒️ Concepts you should be familiar with (spoilers!)

The contracts that you will hack are:

The test script where you will have to write your solution is:

Writeup

PoC

The concept of .

This could be useful

cross-function reentrancy
article
ModernWETH.sol
Challenge2.t.sol
https://github.com/ret2basic/AMAZEX-DSS-PARIS/tree/main/src/2_ModernWETH
ModernWETH