The informal security review of the patch to fix the vulnerability of the Poly Network hack

Disclaimer:

We only provide an informal security review of the patch. Our evaluation shows that the patch can fix the vulnerability that was previously attacked on Aug 10, 2021. However, our review does not guarantee that there do not exist other vulnerabilities in other components of the project.

Our review

Basically, the method to fix the vulnerability is using allow lists. The allow lists are initialized when creating the EthCrossChainManager. By doing so, this patch can ensure the following security properties.

  • Property one: Only the contract in the allow lists can invoke the crossChain function, which is used to start the cross-chain transaction.
  • Property two: Only the method and the contract in the allow lists can be invoked by the cross-chain transaction.

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BlockSec

BlockSec

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The BlockSec Team focuses on the security of the blockchain ecosystem and the research of crypto hack monitoring and blocking, smart contract auditing.