incorrect token wrap and unwrapping validation
Days in Operation:
Meter Passport bridge has been hacked. Passport has a feature to automatically wrap and unwrap gas tokens like ETH and BNB for user convenience. The contract did not block direct interaction of the wrapped ERC20 tokens for the native gas token and did not properly transfer and verify the correct number of WETH transferred from the callers' address. A loss of $4.3M including 1391 ETH and 2.7 BTC has been recorded.
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