Improper input validation in Block18
CVE-2018-12703
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."
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- huobiglobal.zendesk.com/hc/en-us/articles/360000110521-HADAX-Suspends-18T-and-G… (Third Party Advisory)
- peckshield.com/2018/06/23/evilReflex/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-12703?
- CVE-2018-12703 is a high-severity vulnerability in Block18, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2018-06-25.
- How severe is CVE-2018-12703?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2018-12703 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.