According to SlowMist, the attacker exploited a flawed EIP-7702 account to steal 1,988.5 QNT (approximately 54.93 ETH) from the QNT reserve pool. The root cause was that the reserve pool’s EOA delegated code to the BatchExecutor contract via EIP-7702, and this contract designated the unauthorized BatchCall contract as an authorized caller. Since the BatchCall.batch() function lacks any permission checks, any external caller can invoke it, ultimately leading to the depletion of the reserve pool’s assets.
SlowMist: EIP-7702 Account Vulnerability Exploited, 1,988.5 QNT Stolen
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Summary
SlowMist reported that a vulnerability in EIP-7702 enabled attackers to steal 1,988.5 QNT (approximately 54.93 ETH) from a reserve pool. The issue arose from a BatchExecutor contract that allowed any caller to invoke the BatchCall function without proper permission checks. As CFT regulations intensify, such exploits underscore the risks inherent in smart contract design. While BTC remains a hedge against inflation, this incident highlights the urgent need for stronger security measures in DeFi protocols.
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