Practical Security Guide to Dependency Vulnerability Scanning

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**The Risk**

Dependency vulnerabilities can be exploited by attackers to gain unauthorized access to sensitive data. For example, the npm package event-stream was compromised in 2018, allowing attackers to steal cryptocurrency from users. This was done by injecting malicious code into the package, which was then installed by unsuspecting developers.

**The Vulnerability**

Consider the following example of an insecure package.json file:

{
  "name": "my-app",
  "version": "1.0.0",
  "dependencies": {
    "express": "4.17.1"
  }
}

In this example, the express package is pinned to a specific version (4.17.1), but this version may contain known vulnerabilities. If an attacker discovers a vulnerability in this version of express, they can exploit it to gain access to the application.

**The Fix**

To secure the package.json file, we can use a tool like npm audit to identify and fix vulnerabilities. Here's an updated package.json file with the vulnerable package updated:

{
  "name": "my-app",
  "version": "1.0.0",
  "dependencies": {
    "express": "4.18.2"
  }
}

In this example, the express package has been updated to a version (4.18.2) that fixes the known vulnerability.

**Checklist**

Before shipping your application, verify the following:

1. Run npm audit: Use the npm audit command to identify and fix vulnerabilities in your dependencies.

2. Keep dependencies up-to-date: Regularly update your dependencies to ensure you have the latest security patches.

3. Use a dependency manager: Use a tool like npm or yarn to manage your dependencies and ensure you're using the latest versions.

4. Monitor vulnerability reports: Keep an eye on vulnerability reports for your dependencies and update them as soon as possible.

5. Use a Web Application Firewall (WAF): Consider using a WAF to protect your application from common web attacks.

**Tools**

The following tools can help automate dependency vulnerability scanning:

* npm audit: A built-in npm command that identifies and fixes vulnerabilities in your dependencies.

* snyk: A tool that scans your dependencies for vulnerabilities and provides recommendations for fixing them.

* owasp-dependency-check: A tool that scans your dependencies for vulnerabilities and provides a report on the results.

To get started with snyk, install it using npm:

npm install -g snyk

Then, run snyk test to scan your dependencies for vulnerabilities:

snyk test