Erroneous Proof of Work calculation in geth

Impact

An ethash mining DAG generation flaw in Geth could cause miners to erroneously calculate PoW in an upcoming epoch (estimated early January, 2021). This happened on the ETC chain on 2020-11-06. This issue is relevant only for miners, non-mining nodes are unaffected.

Patches

This issue is also fixed as of 1.9.24. Thanks to @slavikus for bringing the issue to our attention and writing the fix.

Workarounds

This PR implements a patch: https://github.com/ethereum/go-ethereum/pull/21793

References

https://blog.ethereum.org/2020/11/12/geth_security_release/

For more information

If you have any questions or comments about this advisory:

• Open an issue in go-ethereum
• Email us at security@ethereum.org