CVEvulnerability

CVE-2018-17877

7.5 HIGH Published 2018-10-23 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2018-10-23
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.0 ([email protected])
7.5 HIGH — CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0 ([email protected])
5.0 MEDIUM — AV:N/AC:L/Au:N/C:P/I:N/A:N
Weaknesses
CWE-338

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.

Affected configurations

• greedy599 greedy 599

Related

Weakness · CWE (1)

  • CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) weakness

References