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近一亿美元天价损失 Harmony跨链桥黑客攻击事件分析
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北京时间2022年6月23日19:06:46，CertiK审计团队监测到Harmony链和以太坊之间的跨链桥经历了多次恶意攻击。 CertiK团队安全专家分析，此次攻击事件可能源于黑客掌握了owner的私钥——攻击者控制MultiSigWallet的所有者直接调用confirmTransaction（）从Harmony的跨链桥上转移大量代币，导致Harmony链上价值约9700万美元的资产被盗。 攻击步骤 我们以13100 ETH的第一次利用漏洞交易为例： ①MultiSigWallet合约的所有者0xf845a7ee8477ad1fb446651e548901a2635a915调用submitTransaction（）函数提交具有以下有效负载的交易，以在交易中生成交易id 21106。 
②要确认交易，调用方必须是合约所有者。 ③在接下来的攻击中，MultiSigWallet合约所有者（0x812d8622c6f3c45959439e7ede3c580da06f8f25）的MultiSigWallet 调用函数confirmTransaction（），其中输入的交易ID为21106。 
④要成功执行交易，调用方必须是合约所有者。 
⑤executeTransaction（）函数使用输入数据调用了一个外部调用，该调用将触发Ethmanager合约上的unlockEth（）函数。 
⑥unlockEth() 函数的传入数据指定了金额、收件人和收款人。 
⑦由于攻击者以某种方式控制了所有者的权限，因此攻击者能够执行id为21106的事务，该事务将13100 ETH传输到攻击者的地址0x0d043128146654C7683Fbf30ac98D7B2285DeD00。 ⑧攻击者在其他ERC20Manager合约上使用不同的交易ID重复了前面的过程，以传输大量ERC20令牌和StableCoin。 资产去向 截至撰稿时，约9700万美元的被盗资产仍存储于地址0x0d043128146654C7683Fbf30ac98D7B2285DeD00中。 漏洞交易 以下交易攻击者盗取13,100 ETH， 价值约14,619,600美元(使用ETH现有价格：$1116)：https://etherscan.io/tx/0x27981c7289c372e601c9475e5b5466310be18ed10b59d1ac840145f6e7804c97 [13,100 ETH] |
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