First Flight #15: Mondrian Wallet

Summary

Mondrian Wallet recommends users create accounts mean addresses, and utilize UserOperations (UserOps) within the ERC-4337 framework. UserOps allows delegating transaction initiation to third-party addresses, but security measures are crucial to prevent unauthorized access.

The provided code snippet reveals a potential security concern due to the absence of an explicit "signature aggregator contract" in the _validateSignature function.

Vulnerability Details

The _validateSignature function focuses solely on verifying the cryptographic signature on a UserOp.
It doesn't inherently check if the signing address is authorized to create UserOps for the wallet.
Without an aggregator contract or a separate authorization check within the EntryPoint contract, there's a risk of unauthorized transactions

Impact

Unauthorized transactions could drain funds from the Mondrian wallet.
Loss of control over the wallet's assets

Tools Used

manual review, foundry test

Recommendations