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.

CVSS v3.0 NVD

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

CVSS v2.0 NVD

4.3 MEDIUMAV:N/AC:M/Au:N/C:P/I:N/A:N

EPSS

1.39% chance of exploitation in the next 30 days, 72nd percentile

Published

2018-08-07

Updated

2024-08-05

Proof-of-concept exploits (1)

• https://medium.com/coinmonks/get-legendary-items-by-breaking-pnrg-of-mycyptochamp-an-ethe…

Security advisories

• https://etherscan.io/address/0x689FB61845488297dfE7586E5f7956475955d2Dc
• https://etherscan.io/address/0xa44e464b13280340904ffef0a65b8a0033460430

References

• CVE Record
• NVD entry