MarketPlace.sol: createMarket should check if market already exists before creating

Handle itsmeSTYJ Vulnerability details Impact createMarket is a privileged function that can only be called by an admin but that doesn't necessarily mean that it is not susceptible to mistakes. Furthermore, it is a function that is called somewhat often so following murphy's law - anything can go...

use of transfer() instead of call() to send eth

Handle JMukesh Vulnerability details Impact Use of transfer might render ETH impossible to withdraw becuase after istanbul hardfork , there is increases in the gas cost of the SLOAD operation and therefore breaks some existing smart contracts.Those contracts will break because their fallback...

Use of transfer() instead of call() to send eth

Handle JMukesh Vulnerability details Impact Use of transfer might render ETH impossible to withdraw becuase after istanbul hardfork , there is increases in the gas cost of the SLOAD operation and therefore breaks some existing smart contracts.Those contracts will break because their fallback...

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...

OpenZepplin 安全漏洞

OpenZepplin is a library for smart contract development. OpenZepplin has a security vulnerability that stems from a vulnerability in the TimelockController in the affected version that allows elevation of privilege for participants with the executor role...

Rewards squatting - setting rewards in different ERC20 tokens opens various economic attacks.

Handle moose-code Vulnerability details Impact Users have essentially have an option to either claim currently earned reward amounts on future rewards tokens, or the current rewards token. Although stated on line 84, it does not take into account the implications and lock in this contract will ha...

Flash loan risk mitigation is optional and not robust enough

Handle 0xRajeev Vulnerability details Impact The switchEoaOnly allows the owner to disable preventSmartContracts the project’s plan apparently is to do so after the beta-period which will allow any smart contract to interact with the protocol and potentially exploit any underlying flash loan...

Cybercriminals Hold $115,000-Prize Contest to Find New Cryptocurrency Hacks

A top Russian-language underground forum has been running a "contest" for the past month, calling on its community to submit "unorthodox" ways to conduct cryptocurrency attacks. The forum's administrator, in an announcement made on April 20, 2021, invited members to submit papers that assess the...

Call to swapExactTokensForETH in liquidateDai() will always fail

Handle 0xRajeev Vulnerability details Impact liquidateDai calls Uniswap’s swapExactTokensForETH to swap Dai to ETH. This will work if msg.sender, i.e. FSD contract, has already given the router an allowance of at least amount on the input token Dai. Given that there is no prior approval, the call...

Sifchain: Private eth key found

Hello, team! Found private ethereum key at file: https://github.com/Sifchain/sifnode/blob/develop/smart-contracts/.env.example This key points to wallet balance: F1284232 As I understood, private key allows to spend this coins, so it may need to be masked or hidden. Impact eth private key disclos...

.transfer is not safe to use with custom smart contracts

Handle paulius.eth Vulnerability details Impact .transfer is used for transferring ether. It is no longer recommended as recipients with custom fallback functions smart contracts will not be able to handle that. You can read more here: Recommended Mitigation Steps Solution don't forget re-entranc...

Transfer fee is burned on wrong accounts

Handle @cmichelio Vulnerability details Vulnerability Details The Vader.transfer function burns the transfer fee on msg.sender but this address might not be involved in the transfer at all due to transferFrom. Impact Smart contracts that simply relay transfers like aggregators have their Vader...

Sifchain: Private KEY of crypto wallet

Summary: Hello, I'm writing in order to inform you that in your source code is stored the Private key of your crypto wallet that contains some money, as EOS, FNDR, and more. Your wallet address is this: 0x627306090abaB3A6e1400e9345bC60c78a8BEf57 Steps To Reproduce: The key is stored in "those...

Py-EVM is vulnerable to arbitrary bytecode injection

Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.executebytecode call that triggers computation.stack.values with '"stack": 100, 100, 0' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed...

CVE-2018-18920

Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.executebytecode call that triggers computation.stack.values with '"stack": 100, 100, 0' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed...

Design/Logic Flaw

Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.executebytecode call that triggers computation.stack.values with '"stack": 100, 100, 0' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed...

CVE-2018-18920

Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.executebytecode call that triggers computation.stack.values with '"stack": 100, 100, 0' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed...

PYSEC-2018-96

Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.executebytecode call that triggers computation.stack.values with '"stack": 100, 100, 0' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed...

CVE-2018-18920

CVE-2018-18920 concerns Py-EVM v0.2.0-alpha.33, where a crafted vm.execute_bytecode call can manipulate computation._stack.values (e.g., "stack": [100, 100, 0]) in a way that expects a certain byte (b'\x') and results in an invalid opcode, causing execution failure. The description ties this to a...

CVE-2018-18920

Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.executebytecode call that triggers computation.stack.values with '"stack": 100, 100, 0' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed...