Vulnerability Details : CVE-2018-12702
The approveAndCallcode function of a smart contract implementation for Globalvillage ecosystem (GVE), an 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."
Vulnerability category: Input validation
Products affected by CVE-2018-12702
- cpe:2.3:a:gve:globalvillage_ecosystem:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-12702
0.12%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 45 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-12702
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2018-12702
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-12702
-
https://peckshield.com/2018/06/23/evilReflex/
PeckShield Inc. - New evilReflex Bug Identified in Multiple ERC20 Smart Contracts (CVE-2018-12702, CVE-2018-12703)Exploit;Third Party Advisory
-
https://huobiglobal.zendesk.com/hc/en-us/articles/360000110521-HADAX-Suspends-18T-and-GVE-Deposits-and-Withdrawals
HADAX Suspends 18T and GVE Deposits and Withdrawals – Help CenterThird Party Advisory
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