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.
PRNG
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
5.9 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
mitreCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 63%
VendorProductVersion
mycryptochampmycryptochamp
-
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
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
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