World's most popular smart contract $WETH has these bugs, analyst gf_256 says w/ zellic_io
He leveraged Constrained Horn Clause instruments to model all possible states of Wrapped Ethereum . Then, he checked whether the"total supply" metric of WETH smart contract actually equals the number of tokens minted.
He also tried to verify whether it was possible to redeem ETH from WETH at any time; Tong called this function"solvency."Regarding the first point, the analyst unveiled that the total supply is not necessarily equal to the amount of tokens in existence: Technically speaking, the ERC-20 standard specifies that totalSupply should equal the..."total supply". Which is kinda vague, but one would assume that it'd be the total tokens in existence
Via the selfdestruct function, which terminates a contract or transfers of any contract funds to a specified address, users would be able to mint WETH tokens without actually sending ETH for wrapping, Tong concluded.He also demonstrated that the depositor of Ethers will not necessarily be able to withdraw their funds from smart contracts at any time.
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