User can bypass entryFee by sending arbitrary calldata to ParaSwap operator

Lines of code Vulnerability details Impact Any user is able to bypass the entryFee collection when using NestedFactory.create by passing in arbitrary calldata when using the ParaSwap router. High level, a user can pass in calldata to swap from a miniscule amount of input token to an ERC777 with...

DOS set token through erc777 hook

Lines of code Vulnerability details Impact The wfCash is an erc777 token. ERC777.solL376-L380 Users can get the control flow before sending token and after receiving tokens. This creates attack vectors that require extra caution in designing modules. Any combination of modules may lead to a...

User can alter amount returned by redeem function due to control transfer

Lines of code Vulnerability details Impact Control is transferred to the receiver when receiving the ERC777. They are able to transfer the ERC777 to another account, at which time the before and after balance calculation will be incorrect. uint256 balanceBefore = IERC20asset.balanceOfreceiver; if...

ERC777 getReward Reentrancy

Lines of code Vulnerability details Impact Attacker can drain BaseRewardPool.sol if rewardToken is an ERC777 token. Proof of Concept Attacker calls getReward. rewardToken.safeTransfer triggers ERC777 callback and attacker take control of execution flow. Attacker reenters getReward. Attacker repea...

BathToken.sol#_deposit() attacker can mint more shares with re-entrancy from hookable tokens

Lines of code Vulnerability details BathToken.soldeposit calculates the actual transferred amount by comparing the before and after balance, however, since there is no reentrancy guard on this function, there is a risk of re-entrancy attack to mint more shares. Some token standards, such as ERC77...

Malicious ERC20 or ERC777 could be used as collateral

Lines of code Cally.solL296 Vulnerability details Impact A malicious ERC20 or ERC777 could be used as collateral and rug the exerciser on exercise through a malicious implementation of ERC20vault.token.safeTransfer. Proof of Concept Any ERC20/ERC777 token is accepted as there is no whitelist. Thi...

Batch Transfer will likely fail on ERC777 transfers, either maliciously or accidentally

Lines of code Vulnerability details Impact If users attempt to bridge ERC777s from Cosmos to Ethereum, it is highly likely that the transfers will revert. The issue lies in the combination of using safeTransfer and the idea of batching. safeTransfer will revert for any failed transfer meaning tha...

Re-entrancy attack on the main functions

Lines of code Vulnerability details Impact A malicious token, or one that implemented transfer hooks, could re-enter the public calling function such as withdraw before proper internal accounting was completed. Because the earned reward function looks up the pool.totalDepositsWei and...

currentLoanOwner can manipulate loanInfo when any lenders try to buyout

Lines of code Vulnerability details Impact If an attacker already calls lend to lend to a loan, the attacker can manipulate loanInfo by reentrancy attack when any lenders try to buyout. The attacker can set bad values of lendInfo e.g. very long duration, and 0 interest rate that the lender who...

Potential Re-entrancy Attack via ETH or ERC777 Token Transfer

Lines of code Vulnerability details Impact The CEI pattern is not being implemented properly in the claimRewards function of the ConcurRewardPool.sol. function claimRewardsaddress calldata tokens external override for uint256 i = 0; i tokens.length; i++ uint256 getting = rewardmsg.sendertokensi;...

burn and mintTo in Basket.sol vulnerable to reentrancy

Handle 0xalpharush Vulnerability details Impact The functions mintTo and burn make external calls prior to updating the state. If a basket contains an ERC777 token, attackers can mint free basket tokens. Proof of Concept An attacker could reenter the mintTo function when the contract pulls an...

Cream Finance DeFi Platform Rooked For $29M

Cream Finance is the latest decentralized finance DeFi platform for cryptocurrency trading to take a major financial hit at the hands of hackers, losing nearly $19 million in an attack this week on its “flash loan” feature. The attacker was able to steal nearly $29 million before being discovered...