First Flight #1: PasswordStore

Summary

The code declares the state variables s_owner and s_password as private, which is a good practice for encapsulation. However, it's important to note that their values can still be accessed externally through getter functions. To make them entirely inaccessible from outside the contract, you can use the internal visibility modifier.

Vulnerability Details

In the code, the state variables are declared as private:

While these state variables are marked as private, their values can still be accessed externally using the getPassword function. Even though this access is subject to access control checks, there may be situations where you want to completely hide the variables from external access.

Impact

The impact of not making the state variables entirely inaccessible is relatively minor in this specific contract. Since the code already includes proper access control checks, the privacy of the variables is reasonably protected. However, making the variables internal would provide an extra layer of security and ensure that they cannot be accessed externally.

Tools Used

No specific tools are used for this analysis. It's a manual code review based on the provided code snippet.

Recommendations

To enhance the privacy and security of the state variables, it's recommended to use the internal visibility modifier. Here's an example of how to modify the state variable declarations:

Using the internal modifier, you ensure that the state variables are only accessible within the current contract and its derived contracts. This makes them entirely inaccessible from outside the contract, even through getter functions.