CVE-2018-17877

Published: Oct 23, 2018Modified: Nov 21, 2024

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: NVD

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 (1)

Products: Greedy599: Greedy 599

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Greedy599 Greedy 599	All versions

Related CWEs

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.

References (2)

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

Source: cve@mitre.org

ExploitThird Party Advisory

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

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party Advisory

Timeline

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