Vulnerability Details CVE-2018-17071
The fallback function of a simple lottery smart contract implementation for Lucky9io, an Ethereum gambling game, generates a random value with the publicly readable variable entry_number. This variable is private, yet it is readable by eth.getStorageAt function. Also, attackers can purchase a ticket at a low price by directly calling the fallback function with small msg.value, because the developer set the currency unit incorrectly. 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