Vulnerability Details CVE-2018-17877
A lottery smart contract implementation for Greedy 599, an Ethereum gambling game, generates a random value that is predictable via an external contract call. The developer used the extcodesize() function to prevent a malicious contract from being called, but the attacker can bypass it by writing the core code in the constructor of their exploit code. Therefore, it allows attackers to always win and get rewards.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 54.1%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
References
Products affected by CVE-2018-17877
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cpe:2.3:a:greedy599:greedy_599:-