The vulnerability exploitation resulted in suspension of all BeautyChain (BEC) transactions.
Vulnerability details
Advisory: SB2018042311 - Integer overflow in multiple Ethereum-based (ERC20) smart contracts
Vulnerable component: ERC-20
CVE-ID: CVE-2018-10299
CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L/E:H/RL:U/RC:C
CWE-ID: CWE-190 - Integer overflow
Description:
The vulnerability allows a remote attacker to perform unauthorized actions.
The vulnerability exists due to integer overflow in the batchTransfer() function of a smart contract implementation for Beauty Ecosystem Coin (BEC). The Ethereum ERC20 token used in the Beauty Chain economic system allows attackers to accomplish an unauthorized increase of digital assets by providing two _receivers arguments in conjunction with a large _value argument.
The vulnerability is dubbed "batchOverflow". It is exploited in the wild and caused suspension of all transactions and transfers by OKEx exchange.