CVE-2018-12885

Public Exploit

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.

References

Link	Tags
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	third party advisory exploit
https://etherscan.io/address/0x689FB61845488297dfE7586E5f7956475955d2Dc	third party advisory

Frequently Asked Questions

What is the severity of CVE-2018-12885?: CVE-2018-12885 has been scored as a medium severity vulnerability.
How to fix CVE-2018-12885?: To fix CVE-2018-12885, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-12885 being actively exploited in the wild?: It is possible that CVE-2018-12885 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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Description

Category

CWE-338 – Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

References

Frequently Asked Questions