PT-2018-13876 · Ethereum · Lucky9Io

Published 2018-09-18 · Updated 2018-12-10 · CVE-2018-17071

Positive Technologies (AI Summary)

CVSS v2.0

5.0

Medium

Base vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

Name of the Vulnerable Software and Affected Versions Lucky9io (affected versions not specified)

Description The issue concerns a simple lottery smart contract implementation for Lucky9io, an Ethereum gambling game. It allows attackers to always win and get rewards due to a couple of flaws. Firstly, the entry number variable, which is intended to be private, can be read using the eth.getStorageAt function. Secondly, attackers can purchase a ticket at a low price by directly calling the fallback function with a small msg.value, because the developer incorrectly set the currency unit. This enables attackers to exploit the system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Weakness Enumeration

CWE-338

Related Identifiers

CVE-2018-17071

Affected Products

Lucky9Io

References · 2

• 🔥 https://github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17071 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2018-17071 · Security Note