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bZx安全事件的初步分析

Code Auditing
November 6, 2021

11月5日,bZX协议报告遭遇黑客攻击。攻击者窃取了受影响智能合约中的代币。在对攻击交易进行初步分析后,我们怀疑此次攻击是由于开发者的私钥泄露所致。

攻击过程

攻击过程大致简单。通过调用特权函数 transferOwnership 将受影响智能合约的所有权转移给一个新的合约,例如 0x0acc0e5faa09cb1976237c3a9af3d3d4b2f35fa5。然后,新的合约所有者可以将已授权给该智能合约的所有代币转移到任意地址。

请注意,特权函数 transferOwnership 只能由智能合约的当前所有者调用。事实上,我们发现调用此函数的地址是 0xb7f72028d9b502dc871c444363a7ac5a52546608,这是受影响智能合约的创建者。

我们无法确切知道合约创建者将所有权转移给其他地址的确切原因。然而,我们怀疑这是由于开发者的私钥泄露(或被盗)所致。

结论

总而言之,DApp私钥的安全性对于应用程序的安全性至关重要,特别是对于那些未使用DAO的项目。我们建议项目方可以采用一些新技术,如机密计算和MPC来保护私钥。

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