Category: Writeups

  • DeFi Hack solutions: DiscoLP

    This is a series of write-ups on DeFi Hack, a wargame based on real-world DeFi vulnerabilities. Other posts: DiscoLP DiscoLP is a brand new liquidity mining protocol! You can participate by depositing some JIMBO or JAMBO tokens. All liquidity will be supplied to JIMBO-JAMBO Uniswap pair. By providing liquidity with us you will get DISCO […]

  • DeFi Hack solutions: May The Force Be With You

    DeFi Hack solutions: May The Force Be With You

    Back in 2018 I hosted the contest EtherHack which featured a set of vulnerable smart contracts. At that time the tasks were focused primarily on the EVM peculiarities like insecure randomness or extcodesize opcode tricks. Back then the first wave of crypto hype was coming to the end when numerous ICOs were falling apart because […]

  • Writeup: “unlink”

    Pretty easy task from but took me waaay too long. We’ve got here three structures allocated on the heap, which are doubly-linked in a ptalloc fashion where a chunk’s header contains a pointer to the previous chunk and to the next one. There is also an obvious overflow which presumably would allow us to […]

  • PolySwarm Smart Contract Hacking Challenge Writeup

    This is a walk through for the smart contract hacking challenge organized by PolySwarm for CODE BLUE conference held in Japan on November 01–02. Although the challenge was supposed to be held on-site for whitelisted addresses only, Ben Schmidt of PolySwarm kindly shared a wallet so that I could participate in the challenge.