CVE-2018-12885 — The randMod() function of the smart contract implementation for MyCryptoChamp, a

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, attack

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2018-08-07T15:00:00.000Z
• Last modified: 2024-08-05T08:45:02.506Z

09References

• etherscan.io — https://etherscan.io/address/0xa44e464b13280340904ffef0a65b8a0033460430
• medium.com — https://medium.com/coinmonks/get-legendary-items-by-breaking-pnrg-of-mycyptocham…
• etherscan.io — https://etherscan.io/address/0x689FB61845488297dfE7586E5f7956475955d2Dc