CVE-2018-17877 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17877

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5