Lack of validation for the tokenUri parameter [code-improvement]

[0xM3R]

File: mint.ts
Issue: Lack of validation for the tokenUri parameter.

Analysis

The vulnerable implementation is as follows:

const tx = await contract.safeMint(recipient, args.tokenUri);

• Unvalidated Input: The tokenUri is used without checking its validity or format.

How It Can Be Harmful

• Malicious Metadata: Invalid or malicious URIs can compromise metadata storage or lead to security vulnerabilities.

How to Mitigate the Issue

1. Validate URIs: Ensure the tokenUri follows a proper format before minting.

if (!args.tokenUri.startsWith("https://")) {
    throw new Error("Invalid token URI format. Must start with 'https://'.");
}

2. Sanitize Inputs: Implement input sanitization to prevent injection of malicious data.

References

• Improper Input Validation in Smart Contracts
  Discusses the importance of input validation to prevent vulnerabilities.
  Metana Blog
• CVE-2024-32649
  Highlights vulnerabilities due to improper input validation in smart contracts.
  CVE Details