Ethereum Contains Consensus Flaw During Block Processing
Moderate severity
GitHub Reviewed
Published
Aug 24, 2021
in
ethereum/go-ethereum
•
Updated Aug 29, 2023
Package
Affected versions
>= 1.10.0, < 1.10.8
Patched versions
1.10.8
Description
Published by the National Vulnerability Database
Aug 24, 2021
Reviewed
Aug 26, 2021
Published to the GitHub Advisory Database
Aug 30, 2021
Last updated
Aug 29, 2023
Credits
-
guidovranken Analyst
Impact
A vulnerability in the Geth EVM could cause a node to reject the canonical chain.
Description
A memory-corruption bug within the EVM can cause a consensus error, where vulnerable nodes obtain a different
stateRootwhen processing a maliciously crafted transaction. This, in turn, would lead to the chain being split in two forks.All Geth versions supporting the London hard fork are vulnerable (which predates London), so all users should update.
This bug was exploited on Mainnet at block 13107518, leading to a minority chain split.
Patches
A patch is included in the
v1.10.8release.The exact patch to fix the issue is contained within this commit
Workarounds
No workarounds exist, save to update and/or apply the patch commit.
References.
Post-mortem write-up.
Credits
The bug was found by @guidovranken (working for Sentnl during an audit of the Telos EVM) and reported via bounty@ethereum.org.
For more information
If you have any questions or comments about this advisory:
References