ChainID is not correctly verified - used old ChainID
Days in Operation:
100 pts each
EthereumPoW, the original Ethereum powered by PoW while Ethereum Foundation insists on a PoS fork in the resulting Merge. Gnosis Chain is a future-forward network built for scalability, community, decentralization and sustainable growth. 10x Carbon Negative since '21.
BlockSec detected that exploiters are replaying the message (calldata) of the PoS chain on EthereumPow. The root cause of the exploitation is that the bridge doesn't correctly verify the actual chainid (which is maintained by itself) of the cross-chain message.
The exploiter (0x82fae) first transferred 200 WETH through the omni bridge of the Gnosis chain, and then replayed the same message on the PoW chain and got extra 200 ETHW. As a result, the balance of the chain contract deployed on the PoW chain would be drained. Omni bridge was maxed at 250 WETH as of time of check.
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