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.

• CWE-338

• https://github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17071Exploit, Third Party Advisory
• https://github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17071Exploit, Third Party Advisory

Published

Sep 18, 2018

Last Modified

Jun 17, 2026

Status

Modified

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