CVE-2018-12703

Public Exploit

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."

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.24%
Third-Party Advisory zendesk.com Third-Party Advisory peckshield.com
Affected: n/a n/a
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2018-12703?
CVE-2018-12703 has been scored as a high severity vulnerability.
How to fix CVE-2018-12703?
To fix CVE-2018-12703, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-12703 being actively exploited in the wild?
It is possible that CVE-2018-12703 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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