CVE-2018-12885 Information

Description

The randMod() function of the smart contract implementation for MyCryptoChamp an Ethereum game generates a random value with publicly readable variables such as the current block information and a private variable (which can be read with a getStorageAt call). Therefore attackers can get powerful champs/items and get rewards.

CVSS Vector

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

Reference

https://etherscan.io/address/0x689FB61845488297dfE7586E5f7956475955d2Dc https://etherscan.io/address/0xa44e464b13280340904ffef0a65b8a0033460430 https://medium.com/coinmonks/get-legendary-items-by-breaking-pnrg-of-mycyptochamp-an-ethereum-online-game-cve-2018-12855-6e6beb41b8df

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.9