CVE Vulnerability

CVE-2018-12885

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.

4.3 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

5.9 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://medium.com/coinmonks/get-legendary-items-by-breaking-pnrg-of-mycyptochamp-an-ethereum-online-game-cve-2018-12855-6e6beb41b8df Exploit Third Party Advisory
https://etherscan.io/address/0xa44e464b13280340904ffef0a65b8a0033460430 Third Party Advisory
https://etherscan.io/address/0x689FB61845488297dfE7586E5f7956475955d2Dc Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:mycryptochamp:mycryptochamp:-:*:*:*:*:*:*:*
Information

Published : 2018-08-07 03:29

Updated : 2018-10-18 02:40

NVD link : CVE-2018-12885

Mitre link : CVE-2018-12885

Products Affected
No products.
CWE
CWE-338

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