First Flight #1: PasswordStore

Summary

The function lacks access control, allowing anyone to change the password. There is no mechanism to verify the caller's authorization, making it susceptible to unauthorized access.

Vulnerability Details

The function does not validate the incoming password, leaving it exposed to potential malicious or invalid inputs.
function setPassword(string memory newPassword) external {
s_password = newPassword;
emit SetNetPassword();
}

Impact

It directly sets the password without considering secure practices like hashing or encryption. Storing plaintext passwords on the blockchain is risky.

Tools Used

Manual Review

Recommendations

To secure the setPassword function in a smart contract, you should consider implementing access control to restrict who can call this function. Use modifiers or require statements to check the sender's authorization, e.g., only allowing the owner or a specific role to call the function.

modifier onlyOwner {
require(msg.sender == owner, "Only the contract owner can call this function");
_;
}

function setPassword(string memory newPassword) external onlyOwner {
// Add input validation if needed
s_password = newPassword;
emit SetNetPassword();
}