CVE-2018-12975 Information

Description

The random() function of the smart contract implementation for CryptoSaga an Ethereum game generates a random value with publicly readable variables such as timestamp the current block’s blockhash and a private variable (which can be read with a getStorageAt call). Therefore attackers can precompute the random number and manipulate the game (e.g. get powerful characters or get critical damages).

CVSS Vector

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

Reference

https://medium.com/@jonghyk.song/create-legendary-champs-by-breaking-prng-of-cryptosaga-an-ethereum-rpg-game-cve-2018-12975-8de733ff8255

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