Mobile Application Security Testing: A Practical Guide to Securing Android & iOS Apps

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Introduction:

Mobile application security is a critical concern for developers and security professionals, as vulnerabilities in Android and iOS apps can lead to data breaches, financial losses, and reputational damage. The OWASP Mobile Application Security Verification Standard (MASVS) provides a framework for assessing app security, covering areas like insecure storage, broken authentication, and improper session handling. This article explores essential test cases, tools, and techniques for securing mobile applications effectively.

Learning Objectives:

  • Understand key mobile app security risks and OWASP MASVS mappings.
  • Learn manual and automated testing techniques for Android and iOS.
  • Apply structured checklists for real-world security assessments.

1. Testing for Insecure Data Storage

Command (Android – ADB):

adb shell ls -la /data/data/<package_name>/databases/

Step-by-Step Guide:

  1. Connect the Android device via USB and enable USB Debugging.
  2. Run the command to list database files stored by the target app.
  3. Check if sensitive data (e.g., passwords, tokens) is stored in plaintext.
  4. Use SQLite3 (adb shell sqlite3 <db_file> "SELECT FROM <table>;") to inspect database contents.

Why It Matters:

Insecure storage is a top mobile app risk. Attackers can extract unencrypted data if apps misuse local storage.

2. Detecting Hardcoded Secrets in APK/iPA Files

Command (Android – jadx):

jadx-gui app.apk

Step-by-Step Guide:

  1. Decompile the APK using jadx (jadx-gui for a visual interface).
  2. Search for hardcoded API keys, passwords, or tokens (Ctrl+F for password, key, secret).
  3. For iOS, use Hopper or Ghidra to analyze `.ipa` files.

Why It Matters:

Hardcoded credentials in app binaries are a severe security flaw, often exploited by attackers.

3. Testing for Broken Authentication (Burp Suite)

Configuration (Burp Suite Proxy):

  1. Set up Burp Suite as a proxy for mobile traffic.
  2. Configure the device to route traffic through Burp (Wi-Fi proxy settings).

3. Intercept login requests and test for:

  • Weak session tokens
  • Lack of rate limiting
  • Credential exposure in logs.

Why It Matters:

Broken authentication allows attackers to hijack accounts via session fixation or brute force.

4. Dynamic Analysis with Frida (Runtime Hooking)

Command (Frida – Android):

frida -U -l script.js -f com.example.app

Step-by-Step Guide:

1. Install Frida Server on the Android device.

  1. Use a Frida script (script.js) to bypass SSL pinning or log method calls.

3. Example script to bypass root detection:

Java.perform(() => {
const RootBeer = Java.use("com.scottyab.rootbeer.RootBeer");
RootBeer.isRooted.overload().implementation = () => false;
});

Why It Matters:

Frida enables dynamic manipulation of app logic, exposing security flaws like weak encryption.

5. Automated Scanning with MobSF

Command (MobSF – Docker):

docker run -p 8000:8000 opensecurity/mobile-security-framework-mobsf

Step-by-Step Guide:

  1. Upload an APK/IPA to MobSF’s web interface (`http://localhost:8000`).

2. Review the automated report for vulnerabilities:

  • Insecure permissions
  • Code obfuscation issues
  • API key leaks.

Why It Matters:

MobSF streamlines security assessments, combining static and dynamic analysis.

  1. Securing API Backends (OWASP API Top 10)

Command (Postman – Testing API Security):

  1. Send a JWT to `/auth/verify` without a signature.
  2. Test for IDOR by modifying user IDs in requests (GET /user/123 → /user/456).
  3. Check for excessive data exposure in API responses.

Why It Matters:

APIs often expose mobile app backends to attacks like Broken Object Level Authorization (BOLA).

7. iOS Binary Protections (SSL Pinning Bypass)

Command (Objection – iOS):

objection --gadget com.example.app explore 
ios sslpinning disable

Step-by-Step Guide:

1. Install Objection (`pip3 install objection`).

  1. Patch the iOS app to bypass SSL pinning for MITM attacks.

3. Use Burp Suite to intercept decrypted traffic.

Why It Matters:

SSL pinning bypass exposes unencrypted communications, revealing API vulnerabilities.

What Undercode Say:

  • Key Takeaway 1: Mobile app security requires a mix of static analysis (code review), dynamic testing (runtime hooks), and automated scanning (MobSF).
  • Key Takeaway 2: OWASP MASVS provides a structured approach to testing, but real-world assessments demand creativity (e.g., Frida for bypassing protections).

Analysis:

As mobile apps handle more sensitive data, security testing must evolve. The rise of AI-driven static analysis (e.g., Semgrep for code patterns) and deeper OS integrations (Android 14’s enhanced sandboxing) will shape future testing methodologies. Ethical hackers must stay ahead with reverse-engineering skills and automation to counter sophisticated attacks.

Prediction:

By 2025, AI-powered penetration testing tools will automate 60% of mobile app security assessments, but manual expertise will remain critical for logic flaws and advanced exploits. Developers must adopt Shift-Left Security to embed testing early in the SDLC.

Want the Full Checklist?

If you found this guide useful, drop a “YES” in the comments or DM for the complete Mobile App Security Test Case Handbook! 🚀

IT/Security Reporter URL:

Reported By: Dharamveer Prasad – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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