#laravel cert

[pentesttestingcorp]

Prevent Subdomain Takeover in Laravel: Risks & Fixes

Introduction

Subdomain takeover is a serious security vulnerability that occurs when an attacker gains control of an unused or misconfigured subdomain. If your Laravel application has improperly removed subdomains or relies on third-party services like GitHub Pages or AWS, it may be at risk. In this blog, we will explore the causes, risks, and how to prevent subdomain takeover in Laravel with practical coding examples.

A compromised subdomain can lead to phishing attacks, malware distribution, and reputational damage. Let’s dive deep into how Laravel developers can safeguard their applications against this threat.

🔍 Related: Check out more cybersecurity insights on our Pentest Testing Corp blog.

What is Subdomain Takeover?

A subdomain takeover happens when a subdomain points to an external service that has been deleted or is no longer in use. Attackers exploit this misconfiguration by registering the service and gaining control over the subdomain.

Common Causes of Subdomain Takeover:

Dangling DNS Records: A CNAME record still points to an external service that is no longer active.

Unused Subdomains: Old test or staging subdomains that are no longer monitored.

Third-Party Services: If a subdomain was linked to GitHub Pages, AWS, or Heroku and the service was removed without updating the DNS settings.

How to Detect a Subdomain Takeover Vulnerability

Before diving into the fixes, let’s first identify if your Laravel application is vulnerable.

Manual Detection Steps:

Check for dangling subdomains: Run the following command in a terminal: nslookup subdomain.example.com If the response shows an unresolved host but still points to an external service, the subdomain may be vulnerable.

Verify the HTTP response: If visiting the subdomain returns a "404 Not Found" or an error stating that the service is unclaimed, it is at risk.

Automated Detection Using Our Free Tool

We recommend scanning your website using our free Website Security Scanner to detect subdomain takeover risks and other security vulnerabilities.

📷 Image 1: Screenshot of our free tool’s webpage:

Screenshot of the free tools webpage where you can access security assessment tools.

How to Prevent Subdomain Takeover in Laravel

Now, let’s secure your Laravel application from subdomain takeover threats.

1. Remove Unused DNS Records

If a subdomain is no longer in use, remove its DNS record from your domain provider.

For example, in Cloudflare DNS, go to: Dashboard → DNS → Remove the unwanted CNAME or A record

2. Claim Third-Party Services Before Deleting

If a subdomain points to GitHub Pages, AWS S3, or Heroku, ensure you delete the service before removing it from your DNS.

Example: If your subdomain points to a GitHub Page, make sure to claim it back before deleting it.

3. Implement a Subdomain Ownership Validation

Modify Laravel’s routes/web.php to prevent unauthorized access:

Route::get('/verify-subdomain', function () { $host = request()->getHost(); $allowedSubdomains = ['app.example.com', 'secure.example.com']; if (!in_array($host, $allowedSubdomains)) { abort(403, 'Unauthorized Subdomain Access'); } return 'Valid Subdomain'; });

This ensures that only predefined subdomains are accessible in your Laravel app.

4. Use Wildcard TLS Certificates

If you manage multiple subdomains, use wildcard SSL certificates to secure them.

Example nginx.conf setup for Laravel apps:

server { listen 443 ssl; server_name *.example.com; ssl_certificate /etc/ssl/certs/example.com.crt; ssl_certificate_key /etc/ssl/private/example.com.key; }

5. Automate Monitoring for Subdomain Takeovers

Set up a cron job to check for unresolved CNAME records:

#!/bin/bash host subdomain.example.com | grep "not found" if [ $? -eq 0 ]; then echo "Potential Subdomain Takeover Risk Detected!" | mail - s "Alert" admin@example.com fi

This script will notify administrators if a subdomain becomes vulnerable.

Test Your Subdomain Security

To ensure your Laravel application is secure, use our free Website Security Checker to scan for vulnerabilities.

📷 Image 2: Screenshot of a website vulnerability assessment report generated using our free tool to check website vulnerability:

An Example of a vulnerability assessment report generated with our free tool, providing insights into possible vulnerabilities.

Conclusion

Subdomain takeover is a critical vulnerability that can be easily overlooked. Laravel developers should regularly audit their DNS settings, remove unused subdomains, and enforce proper subdomain validation techniques.

By following the prevention techniques discussed in this blog, you can significantly reduce the risk of subdomain takeover. Stay ahead of attackers by using automated security scans like our Website Security Checker to protect your web assets.

For more security tips and in-depth guides, check out our Pentest Testing Corp blog.

🚀 Stay secure, stay ahead!

[laravelvuejs]

LARAVEL CERTIFICATION - Things to know about the #Laravel certification - Example Questions - Laravel

LARAVEL CERTIFICATION – Things to know about the #Laravel certification – Example Questions – Laravel

LARAVEL CERTIFICATION – Things to know about the #Laravel certification – Example Questions – Laravel

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I talk you through what is involved in passing the Laravel Certification. I explain how the Laravel Certification works and show some example questions.

New video coming shortly of Laravel, VueJS, Axios crud examples so subscribe and hit the bell!

#Laravel

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[phpprogrammingblr]

PHP Certified Eng Practice Tests - #1 Cert dedicated Backend ☞ http://bit.ly/2LMrTrW #PHP #Laravel

[iamadevelopers]

PHP Certified Eng Practice Tests - #1 Cert dedicated Backend ☞ https://goo.gl/HZoVHY #Laravel #PHP

[robertbryantblog]

How To Buy Ssl Certificate Digicert

How To Know Php Version In Laravel

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from Quick Click Hosting https://quickclickhosting.com/how-to-buy-ssl-certificate-digicert/

[phpdeveloperfan]

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[developer-tv]

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[laravelvuejs]

Applying an SSL cert to a Laravel Forge site's www. domain

Applying an SSL cert to a Laravel Forge site’s www. domain

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Important Note: Many SSL certificate providers now generate certs which work on both the www. and the non-www. version of your domain. If you have a provider that does this (RapidSSL does, and I’ve heard that Comodo does as well), follow these instructions, but instead of buying two certs, just use the same Forge cert ID in both locations.

I ran into an issue this week that ended up…

[phpdeveloperfan]

PHP Certified Eng Practice Tests - #1 Cert dedicated Backend ☞ https://goo.gl/HZoVHY #Laravel #PHP