Vulnerability identifier: #VU12096

Vulnerability risk: High

CVSSv3.1: 10 [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]

CVE-ID: CVE-2018-10299

CWE-ID: CWE-190

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ERC-20
Client/Desktop applications / Other client software

Vendor: Beauty Chain Inc.

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.

Mitigation
Cybersecurity Help is currently unaware of any official solution to resolve this vulnerability.

Vulnerable software versions

ERC-20: All versions

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External links
http://dasp.co/#item-3
http://peckshield.com/2018/04/22/batchOverflow/
http://support.okex.com/hc/en-us/articles/360002944212-BeautyChain-BEC-Withdrawal-and-Trading-Suspe...
http://twitter.com/OKEx_/status/987967343983714304

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.