Sparkn

Summary

Implementation Address Storage Vulnerability in Proxy Contract

Vulnerability Details

The vulnerability stems from the storage and usage of the _implementation address in the Proxy contract. If the _implementation address is manipulated by an attacker, it could result in the proxy delegating calls to an unintended or malicious address, compromising the security and functionality of the contract.

Impact

Manipulation of the _implementation address could lead to unauthorized control over the proxy's behavior, enabling an attacker to execute arbitrary code and potentially lead to unauthorized access or manipulation of contract data.

Tools Used

Manual code review and analysis of the _implementation storage and delegate call logic in the Proxy contract.

Recommendations

To mitigate this vulnerability, follow these recommendations:

1. Immutable Implementation: Make the _implementation address immutable after contract deployment to prevent any modifications to it.

2. Access Control Checks: Implement checks to ensure that the _implementation address can only be set during contract deployment and by authorized users.

3. External Function: Implement an external function to retrieve the current _implementation address, ensuring that no unintended modification can occur.