Zero-day vulnerability in SmartMesh ERC20 token

Integer overflow
CVE-2018-10376

Not patched

Vulnerability exploitation was spotted on April 24 by a blockchain security startup PeckShield. As a result, OKEx has suspended all ERC-20 tokens.

Vulnerability details

Advisory: SB2018042524 - Integer overflow in SmartMesh ERC20 token

Vulnerable component: SmartMesh ERC20 token

CVE-ID: CVE-2018-10376

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 manipulate digital assets.

The vulnerability exists due to integer overflow in a smart contract implementation for SmartMesh (aka SMT) within Ethereum ERC20 token. A remote unauthenticated attacker can increase digital assets via crafted _fee and _value parameter.

Note: the vulnerability was actively exploited in April 2018 and was dubbed "proxyOverflow".

External links:

https://peckshield.com/2018/04/25/proxyOverflow/
https://support.okex.com/hc/en-us/articles/360003019292

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.