CVE-2018-12703 Information

Description

The approveAndCallcode function of a smart contract implementation for Block 18 (18T) an tradable Ethereum ERC20 token allows attackers to steal assets (e.g. transfer the contract’s balances into their account) because the callcode (i.e. _spender.call(_extraData)) is not verified aka the \evilReflex\ issue. NOTE: a PeckShield disclosure states \some researchers have independently discussed the mechanism of such vulnerability.\

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

https://huobiglobal.zendesk.com/hc/en-us/articles/360000110521-HADAX-Suspends-18T-and-GVE-Deposits-and-Withdrawals https://peckshield.com/2018/06/23/evilReflex/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5