Security Analysis Report

File: WToken.sol
Occurrence: Line 16

Summary

The constructor of the WToken contract does not validate the owner_ parameter, allowing it to be set to the zero address (address(0)). This oversight can result in the contract becoming non-functional as no valid owner would be able to execute onlyOwner functions.

Vulnerability Details

The absence of a require statement to validate the owner_ parameter in the constructor allows the _owner to be set as the zero address. The zero address is a special address in Ethereum that no one controls, which leads to the inaccessibility of all functions restricted to the onlyOwner modifier.

Code Snippet:

Impact

If the _owner is set to the zero address:

• Owner-Only Functions Inaccessible: Functions such as mint and burn will no longer be executable, resulting in a denial of service for these operations.

• Irrecoverable Contract State: The lack of a valid owner makes the contract irrecoverable without redeployment.

• Operational and Financial Risks: If the contract is used in a larger system, its malfunction can disrupt dependent components, potentially leading to financial losses or governance deadlocks.

Severity: Medium to High (depends on how critical owner-only operations are for the system).

Tools Used

• Manual code review

• Static analysis of constructor parameters

Recommendations

To mitigate the issue, add a validation check in the constructor to ensure that the owner_ parameter is not the zero address. The updated constructor should look like this: