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Blockchain security company BlockSec revealed that, on September 16, they detected that attackers successfully harvested "lots" of ETHW by replaying the message (i.e., the calldata) of the proof-of-stake (PoS) chain on EthereumPoW (aka the proof-of-work (PoW) chain). The attacker "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. By doing so, the balance of the chain contract deployed on the PoW chain could be drained," the report said. The root cause of the exploitation is that the Omni bridge on the PoW chain uses the old chainId and doesn’t correctly verify the actual chainId of the cross-chain message – and similar issues may exist in other protocols, the firm warned.
A hacker drained $3.3 million from...
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