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Poly网络黑客漏洞修复补丁的非正式安全审查

Code Auditing
August 15, 2021

在本篇博客中,我们将分享我们对修复近期Poly网络漏洞的补丁的非正式安全评估。

免责声明:

我们仅对该补丁进行非正式安全审查。我们的评估表明,该补丁可以修复在2021年8月10日之前遭受攻击的漏洞。然而,我们的审查并不保证项目中其他组件不存在其他漏洞。

我们的审查

基本上,修复该漏洞的方法是使用白名单。白名单在创建EthCrossChainManager时进行初始化。通过这样做,该补丁可以确保以下安全属性:

  • 属性一:只有白名单中的合约才能调用crossChain函数,该函数用于启动跨链交易。
  • 属性二:只有白名单中的方法和合约才能被跨链交易调用。

通过强制执行上述属性,我们认为该补丁可以修复该漏洞。

请注意,我们仅审查了用于修复BSC和以太坊漏洞的特定补丁。我们不确定其他支持原生跨链交易的链是否具有属性一(未审查相应代码的更改)。此外,该补丁并未对Poly链进行安全增强,我们认为,Poly链可能是实施安全策略的更好地方(无需信任源链和目标链)。

致谢:Yufeng Hu, Siwei Wu, Lei Wu, Yajin Zhou @ BlockSecTeam

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