Vulnerability in Mycryptochamp
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.014 (71.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- etherscan.io/address/0xa44e464b13280340904ffef0a65b8a0033460430 (Third Party Advisory)
- medium.com/coinmonks/get-legendary-items-by-breaking-pnrg-of-mycyptochamp-an-et… (Exploit, Third Party Advisory)
- etherscan.io/address/0x689FB61845488297dfE7586E5f7956475955d2Dc (Third Party Advisory)
Frequently asked questions
- What is CVE-2018-12885?
- CVE-2018-12885 is a medium-severity vulnerability in Mycryptochamp, classified under Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG). CVSS score: 5.9/10. Published 2018-08-07.
- How severe is CVE-2018-12885?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2018-12885 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.