Trivy vulnerability scanning

Trivy Vulnerability Scanning

Overview

Trivy is a simple, comprehensive vulnerability scanner that can analyze npm package-lock.json files for known security vulnerabilities. It works offline with a local vulnerability database.

Installation

# Install Trivy
apt-get update && apt-get install -y trivy

# Verify installation
trivy --version

Database Setup

Trivy requires a vulnerability database. For offline mode:

# Download the vulnerability database
trivy image download-db --severity HIGH,CRITICAL

# Or let Trivy auto-download on first use
trivy config /root/package-lock.json

Scanning Modes

Scan package-lock.json

trivy config /root/package-lock.json \
  --format json \
  --output results.json \
  --severity HIGH,CRITICAL

Scan Options

• --format json: Output JSON format (best for parsing)
• --severity HIGH,CRITICAL: Only HIGH and CRITICAL vulnerabilities
• --output file.json: Write to file
• --offline-db: Use offline database if downloaded
• --skip-update: Skip database update (offline mode)

Output Structure

Trivy JSON output contains:

{
  "Results": [
    {
      "Target": "package-lock.json",
      "Type": "npm",
      "Misconfigurations": null,
      "Vulnerabilities": [
        {
          "VulnerabilityID": "CVE-2021-12345",
          "PkgName": "lodash",
          "InstalledVersion": "4.17.20",
          "FixedVersion": "4.17.21",
          "Severity": "HIGH",
          "Title": "Prototype pollution",
          "Description": "...",
          "References": ["https://nvd.nist.gov/vuln/detail/CVE-2021-12345"]
        }
      ]
    }
  ]
}

Parsing Results

import json

def parse_trivy_results(json_file):
    with open(json_file, 'r') as f:
        data = json.load(f)

    vulnerabilities = []
    for result in data.get('Results', []):
        for vuln in result.get('Vulnerabilities', []):
            if vuln['Severity'] in ['HIGH', 'CRITICAL']:
                vulnerabilities.append({
                    'package': vuln['PkgName'],
                    'version': vuln['InstalledVersion'],
                    'cve_id': vuln['VulnerabilityID'],
                    'severity': vuln['Severity'],
                    'title': vuln['Title'],
                    'fixed_version': vuln.get('FixedVersion', 'N/A'),
                    'references': vuln.get('References', [])
                })

    return vulnerabilities

Usage

Use this skill when:

• Scanning npm package-lock.json for vulnerabilities
• Need offline vulnerability detection
• Building security audit pipelines
• Filtering for specific severity levels

Related Skills

• cvss-score-extraction: Extract CVSS scores for detected vulnerabilities
• security-audit-csv-reporting: Convert results to CSV format