Rewards - Bug Bounties
Incorrect implementation of evmone EVM
Days in Operation:
Yaron Velner of RiskDAO reported a critical vulnerability in Godwoken Chain where it is possible to undo the effect of EVM reverts. This discovery led to the possibility to execute flash loan to drain the DEX TVL without paying it back.
Godwoken chain is a Layer 2 built using Nervos' Layer 1. It is an inherently multi-chain solution utilizing advanced account abstraction that allows for flexible wallet support, or traditional user accounts, for an internet-like experience.
The critical issue was patched by the Godwoken team and an undisclosed bounty was awarded.
The root cause for the bug is that evmone (the EVM implementation Godwoken is using) requires the ‘host’ to revert the call failure (include logs, account state, and other state changes make inside the call), in the buggy version they ignored this mechanism (and assumed the evmone will do the reverting job between calls), and only handled the whole transaction level reverting.
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