CVEvulnerability
CVE-2018-12885
5.9 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2018-08-07
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.0 ([email protected])
- 5.9 MEDIUM — CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CVSS 2.0 ([email protected])
- 4.3 MEDIUM — AV:N/AC:M/Au:N/C:P/I:N/A:N
- Weaknesses
- CWE-338
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.
Affected configurations
• mycryptochamp mycryptochamp
Related
Weakness · CWE (1)
- CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) weakness
References
- https://etherscan.io/address/0x689FB61845488297dfE7586E5f7956475955d2Dc Third Party Advisory
- https://etherscan.io/address/0xa44e464b13280340904ffef0a65b8a0033460430 Third Party Advisory
- 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/0x689FB61845488297dfE7586E5f7956475955d2Dc Third Party Advisory
- https://etherscan.io/address/0xa44e464b13280340904ffef0a65b8a0033460430 Third Party Advisory
- https://medium.com/coinmonks/get-legendary-items-by-breaking-pnrg-of-mycyptochamp-an-ethereum-online-game-cve-2018-12855-6e6beb41b8df Exploit, Third Party Advisory