Challenge #6 - SelfieA new cool lending pool has launched! It's now offering flash loans of DVT tokens.Wow, and it even includes a really fancy governance mechanism to control it.What could go wrong, right ?You start with no DVT tokens in balance, and the pool has 1.5 million. Your objective: take them all.See the contractsComplete the challengeContract AuditSelfiePool.solSelfiePool.solState VariablesERC20Snapshot public token; SimpleGovernance public governance;Variable for initial inst...

Challenge #6 - SelfieA new cool lending pool has launched! It's now offering flash loans of DVT tokens.Wow, and it even includes a really fancy governance mechanism to control it.What could go wrong, right ?You start with no DVT tokens in balance, and the pool has 1.5 million. Your objective: take them all.See the contractsComplete the challengeContract AuditSelfiePool.solSelfiePool.solState VariablesERC20Snapshot public token; SimpleGovernance public governance;Variable for initial inst...

Challenge #4 — Side entranceA surprisingly simple lending pool allows anyone to deposit ETH, and withdraw it at any point in time. This very simple lending pool has 1000 ETH in balance already, and is offering free flash loans using the deposited ETH to promote their system. You must take all ETH from the lending pool.Contract AuditState Variablemapping (address=>uint256) private balancesIt is used for flash Loan Pool management and cannot be accessed from outside because it is a private acce...

Challenge #4 — Side entranceA surprisingly simple lending pool allows anyone to deposit ETH, and withdraw it at any point in time. This very simple lending pool has 1000 ETH in balance already, and is offering free flash loans using the deposited ETH to promote their system. You must take all ETH from the lending pool.Contract AuditState Variablemapping (address=>uint256) private balancesIt is used for flash Loan Pool management and cannot be accessed from outside because it is a private acce...

Challenge #5 — The rewarderThere’s a pool offering rewards in tokens every 5 days for those who deposit their DVT tokens into it. Alice, Bob, Charlie and David have already deposited some DVT tokens, and have won their rewards! You don’t have any DVT tokens. But in the upcoming round, you must claim most rewards for yourself. Oh, by the way, rumours say a new pool has just landed on mainnet. Isn’t it offering DVT tokens in flash loans?See the contractsComplete the challengeContract AuditFlash...

Challenge #5 — The rewarderThere’s a pool offering rewards in tokens every 5 days for those who deposit their DVT tokens into it. Alice, Bob, Charlie and David have already deposited some DVT tokens, and have won their rewards! You don’t have any DVT tokens. But in the upcoming round, you must claim most rewards for yourself. Oh, by the way, rumours say a new pool has just landed on mainnet. Isn’t it offering DVT tokens in flash loans?See the contractsComplete the challengeContract AuditFlash...

Challenge #2 - Naive receiverThere's a lending pool offering quite expensive flash loans of Ether, which has 1000 ETH in balance. You also see that a user has deployed a contract with 10 ETH in balance, capable of interacting with the lending pool and receiveing flash loans of ETH. Drain all ETH funds from the user's contract. Doing it in a single transaction is a big plus ;)Contract Code AuditNaiveReceiverLenderPool.solNaiveReceiverLenderPool.solState Variableuint256 private consta...

Challenge #2 - Naive receiverThere's a lending pool offering quite expensive flash loans of Ether, which has 1000 ETH in balance. You also see that a user has deployed a contract with 10 ETH in balance, capable of interacting with the lending pool and receiveing flash loans of ETH. Drain all ETH funds from the user's contract. Doing it in a single transaction is a big plus ;)Contract Code AuditNaiveReceiverLenderPool.solNaiveReceiverLenderPool.solState Variableuint256 private consta...

Challenge #1 - UnstoppableThere’s a lending pool with a million DVT tokens in balance, offering flash loans for free. If only there was a way to attack and stop the pool from offering flash loans … You start with 100 DVT tokens in balance.Code AuditUnstoppableLender.solUnstoppableLender.solQuick Security CheckBy using the ReentrancyGuard contract, ReentrancyGuard’s nonReentrant Modifier is applied to the internal functions of the main contract to prevent reentrancy calls from occurring.State ...

Challenge #1 - UnstoppableThere’s a lending pool with a million DVT tokens in balance, offering flash loans for free. If only there was a way to attack and stop the pool from offering flash loans … You start with 100 DVT tokens in balance.Code AuditUnstoppableLender.solUnstoppableLender.solQuick Security CheckBy using the ReentrancyGuard contract, ReentrancyGuard’s nonReentrant Modifier is applied to the internal functions of the main contract to prevent reentrancy calls from occurring.State ...

Challenge #3 - TrusterMore and more lending pools are offering flash loans. In this case, a new pool has launched that is offering flash loans of DVT tokens for free. Currently the pool has 1 million DVT tokens in balance. And you have nothing. But don't worry, you might be able to take them all from the pool. In a single transaction.TrusterLenderPool.solTrusterLenderPool.solContract AuditState VariableIERC20 public immutable damnValuableTokenIERC20 standard damnValuableToken used global...

Challenge #3 - TrusterMore and more lending pools are offering flash loans. In this case, a new pool has launched that is offering flash loans of DVT tokens for free. Currently the pool has 1 million DVT tokens in balance. And you have nothing. But don't worry, you might be able to take them all from the pool. In a single transaction.TrusterLenderPool.solTrusterLenderPool.solContract AuditState VariableIERC20 public immutable damnValuableTokenIERC20 standard damnValuableToken used global...