A new vulnerability in the smart contracts Ethereum allows you to empty people's wallets
Source:The Developer under the name Level K said about the existence of the vulnerability Ethereum, which allows the crooks to produce a huge amount GasToken when receiving ETH. Recall GasToken is a smart contract that allows you to tokenservice gas. In other words, with this improvement the user can save cheap gas and to spend it with increasing prices.
thea New vulnerability Ethereum
What is the bug? At the time of adoption of the transaction the recipient of the ETH can attack for deliberate sabotage to the sender. The recipient generates a random calculation, because of which there is the creation of tokens GasToken.
According to the rules Ethereum these calculations must be paid by the sender. If he is not a restriction on the gas, it will simply use up the entire balance of your Ethereum wallet. In theory, the scammer can even get the benefit of the whole operation, if you use enough resources to attack.
The Vulnerability also applies to ERC-20 ERC-721 tokens. More clearly the mechanism of attacks of sabotage described himself Level K.
Imagine that Alice owns the stock exchange, where Bob wants to hurt. Bob can initiate insights to the address of the smart contract with the help of the evaluation function. If Alice does not set a limit on the gas, it will pay the Commission for the transaction from their hot wallet. Requesting a huge amount of the transaction, Bob can completely empty the purse of Alice. To profit, Bob will start producing tokens GasToken, which then, theoretically, you can convert in the ETH.
image Source — the Penn Memory Center
According to Level K, the exchangers, which could be a target of fraud, was notified on 13 November. The developer tried to send warnings to the maximum number of the largest kryptomere.
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