Web Application Pentest Checklist: 25 Things Every Team Should Verify

Web Application Pentest Checklist: 25 Things Every Team Should Verify

Securing web applications is a critical task for startups. With cyber threats evolving rapidly, a comprehensive approach to web application penetration testing has become essential. This checklist covers 25 crucial elements every team should verify during a pentest to ensure robust protection against potential breaches.

Understanding the Threat Landscape

Before diving into specifics, it's vital to recognize the web application security landscape. Cybercriminals exploit known vulnerabilities like SQL injection, cross-site scripting (XSS), and others, leading to significant data breaches. For context, consider CVE-2019-11043, a buffer overflow in PHP-FPM that compromised many web applications until patched.

Core Areas to Assess in Security Testing

1. Input Validation & Sanitization

• Ensure that your application thoroughly validates all user inputs to prevent injection attacks. Use tools like OWASP ZAP to simulate attacks such as SQL Injection.
• Example code: use libraries like JOOQ or SQLAlchemy to parameterize SQL queries.

String query = "SELECT * FROM users WHERE email = ?";
PreparedStatement pstmt = connection.prepareStatement(query);
pstmt.setString(1, "user@example.com");

2. Authentication Mechanisms

• Verify all systems enforcing multifactor authentication (MFA) where possible.
• Deploy robust password policies using tools like Firebase Authentication to ensure passwords are strong and unpredictably unique.

3. Authorization Protocol Check

• Ensure role-based access control (RBAC) is implemented and adequately reviewed. Check for issues like IDOR (Insecure Direct Object References) tested using tools such as Burp Suite.

4. Data Encryption in Transit and at Rest

• Implement HTTPS using TLS 1.2 or higher to protect data in transit. Test configurations for weak ciphers with SSL labs online tool.
• Ensure sensitive data is encrypted at rest, using AES-256 or similar strong algorithms.

5. Session Management

• Look for session fixation and hijacking vulnerabilities. Test session expiration and regeneration policies.
• Include logic in web frameworks like Django to invalidate sessions upon logout.

6. Cross-Site Scripting (XSS) Mitigation

• Use content security policy (CSP) headers to restrict script execution. Test for XSS using payloads from the OWASP XSS Filter Evasion Cheat Sheet.

7. CSRF Protection

• Ensure that anti-CSRF tokens are implemented and validated in sensitive state-changing requests.

8. Security Headers Inspection

• Deploy security headers like HSTS, X-Frame-Options, and Content Security Policy (CSP). Use Mozilla Observatory for automatic checks.

9. Directory Listing and Server Configuration

• Disable directory indexing and review server and framework configurations for minimal exposure.

10. Error Handling and Logging

• Securely handle errors without exposing stack traces. Ensure logs are structured and reviewed for suspicious activities.

11. Open Redirect Verification

• Check for unvalidated redirects and forwards to mitigate phishing and redirect-based attacks.

12. Dependency Vulnerabilities

• Regularly scan dependencies for known vulnerabilities using Snyk or OWASP Dependency-Check.

13. Software Development Life Cycle Practices

• Incorporate security at the early stages by adopting secure coding practices following OWASP Secure Coding Guidelines.

14. API Security Standards

• Scrutinize public and private APIs by enforcing rate limiting and ensuring proper authentication.

15. Rate Limiting and Throttling

• Protect against abusive request patterns to safeguard your application infrastructure.

16. Remote Code Execution (RCE) Checks

• Regularly test for RCE vulnerabilities such as those showcased in CVE-2022-22965 affecting Spring Framework.

17. File Upload Restrictions

• Ensure proper validation and storage of uploaded files. Use libs like libmagic to verify file types.

18. Content Security Policy Enforcement

• Strengthen CSP settings to mitigate XSS and injection threats effectively.

19. Third-Party Libraries Maintenance

• Adopt proven libraries with continuous maintenance and security reviews.

20. Network Security Testing

• Conduct internal and external network scans to uncover exposed services using tools like Nmap and Nessus.

21. Container Security Review (if applicable)

• Secure containerized environments by scanning images with Clair or Anchore Engine.

22. Custom Script Evaluations

• Test custom scripts for logic vulnerabilities that automated tools might miss.

23. Additional Multi-Vector Attack Mitigations

• Consider DDoS protection services like Cloudflare to reduce risk of volumetric attacks.

24. Re-access to Decommissioned Resources

• Verify that all assets previously removed or replaced are thoroughly de-provisioned.

25. Regular Security Audits

• Engage professional security audits to maintain up-to-date security measures mapped to emerging threats.

Actionable Insights

To effectively manage web application security, frequent revisitation of your strategy and adjustments to evolving threats are necessary. This list is not exhaustive, but covers most bases to reduce your risk exposure significantly.

> Pro Tip: Using tools like OWASP ZAP and Burp Suite for automated pentesting processes amplifies vulnerability detection capabilities.

Secure Your Startup with Confidence

In conclusion, while vulnerability management can seem daunting, following a comprehensive pentesting checklist ensures your web application remains secure. Start by implementing the steps discussed, revisiting them regularly.

Ready to Protect Your App?

Schedule a free security audit with *Fix My Code* today, and let's fortify your startup's defenses against looming cyber threats. Our expert team ensures that your applications are secure, performant, and aligned with industry best practices.