🤖 Android App Security Audit Plan #

Subject: Security Audit of Android Mobile Application
Date: Planned for 1 August 2024 – 10 August 2024
Location: Bristol, United Kingdom
Company Conducting the Test: CyberSentinel Solutions LTD
Version: 1.0

📑 Executive Summary #

This document provides a comprehensive framework for conducting a security audit of an Android mobile application. The primary focus is to identify vulnerabilities within the APK, evaluate data handling protocols, secure communication channels, and ensure compliance with regulatory standards such as GDPR and OWASP MASVS.

The audit encompasses static and dynamic analysis, including reverse engineering of the application code, runtime manipulation, and deep-dive assessments of backend API interactions.

Scope of the Audit:

[01] Android Application: APK binary, manifest configurations, and source code logic.
[02] Back-End Services: REST/GraphQL APIs and integrated web services.
[03] Network Communications: Traffic encryption (TLS), Certificate Pinning, and MitM resilience.
[04] User Data Security: Encryption at rest (SQLite, SharedPrefs) and Data Leakage Prevention (DLP).

🎯 Audit Objectives #

Code Integrity: Identify vulnerabilities in the application’s logic and configuration that could compromise user privacy.
Transport Security: Ensure all data in transit is encrypted and resilient against interception (Man-in-the-Middle).
Compliance: Verify adherence to Google Play Store security requirements and GDPR “Privacy by Design.”
Auth & Session: Test authentication and session management to prevent account takeover (ATO).
Data Protection: Validate that sensitive data (PII, credentials) is encrypted using industry-standard algorithms (AES-256).

🛠️ Tactical Toolkit [Mobile Sec & Forensics] #

The audit utilizes a specialized hardware and software stack designed for mobile application reverse engineering and runtime analysis.

# Mobile Security Audit Loadout
equipment:
  - tool: "MobSF (Mobile Security Framework)"
    use: "Automated static/dynamic analysis and metadata extraction."
  - tool: "Jadx & APKTool"
    use: "Decompiling APKs to smali/Java source code for manual audit."
  - tool: "Frida & Objection"
    use: "Runtime instrumentation and hooking to bypass SSL pinning or inspect memory."
  - tool: "Burp Suite Mobile Assistant"
    use: "Intercepting and manipulating HTTPS traffic between app and API."
  - tool: "Drozer"
    use: "Comprehensive security assessment of Android IPC and attack surface."
  - tool: "ADB (Android Debug Bridge)"
    use: "Direct device interaction, logcat analysis, and filesystem extraction."

🔬 Phases of the Security Assessment #

Phase 1: Pre-Audit Preparation #

Architecture Mapping: Identify API endpoints, third-party SDKs (Firebase, Facebook SDK), and data storage mechanisms.
Compliance Review: Verify legal authorization and GDPR data processing impact assessments (DPIA).

Phase 2: Static Application Security Testing (SAST) #

[01] Reverse Engineering: Decompiling the APK to search for hardcoded API keys, private certificates, or “TODO” comments in source code.
[02] Manifest Analysis: Reviewing AndroidManifest.xml for android:debuggable="true", exported components (Activities, Services, Providers), and excessive permissions (e.g., READ_SMS, ACCESS_FINE_LOCATION).
[03] Obfuscation Check: Verifying if ProGuard or R8 has been correctly implemented to prevent trivial reverse engineering.

Phase 3: Dynamic Application Security Testing (DAST) #

[04] Traffic Analysis: Using mitmproxy or Burp Suite to inspect traffic. Testing for SSL Pinning implementation and resistance to certificate transparency bypasses.
[05] Runtime Manipulation: Using Frida to hook into sensitive functions (e.g., checkPassword()) to bypass authentication logic or dump unencrypted data from memory.
[06] Local Storage Audit: Accessing /data/data/[package_name]/ on a rooted test device to check for plaintext credentials in shared_prefs, SQLite databases, or internal cache files.

Phase 4: Backend & API Security Testing #

[07] API Fuzzing: Testing the backend infrastructure for BOLA (Broken Object Level Authorization) and injection flaws (SQLi, Command Injection).
[08] Rate Limiting: Attempting brute-force attacks on login and 2FA endpoints to verify server-side throttling.
[09] Infrastructure Audit: Scanning the hosting environment for open management ports (SSH, RDP) or insecure server headers.

📊 Vulnerability Severity Ranking (OWASP Risk Model) #

Severity	Category	Audit Task	Expected Control
CRITICAL	Data Protection	Task 7: Insecure Storage	AES-256 Encryption in SQLCipher / Keystore
HIGH	Transport	Task 5: Network Traffic	Strict TLS 1.2+ with Certificate Pinning
HIGH	Authentication	Task 6: Session Management	Secure, short-lived JWTs / OAuth 2.0
MEDIUM	Configuration	Task 3: APK Analysis	Code Obfuscation (R8/ProGuard) & Root Detection
MEDIUM	Privacy	Task 4: Permission Review	Principle of Least Privilege (PoLP)

🛡️ Strategic Recommendations #

Implement Certificate Pinning: Ensure the app only communicates with verified server certificates to neutralize advanced MitM attacks.
Use Android Keystore: Store cryptographic keys in the hardware-backed Keystore system rather than the application’s internal storage.
Harden Obfuscation: Use advanced obfuscation techniques to hide the logic of sensitive business functions and API communication.
Root & Emulator Detection: Implement runtime checks to prevent the application from running on compromised (rooted) devices or in analysis environments.
Server-Side Validation: Never trust the client. Ensure all logic and permission checks are strictly enforced on the backend API.

# AUTHORIZATION AND SIGN-OFF
Prepared by:
[+] Dr. James Anderson   | Lead Security Auditor
[+] Emily Walker         | Senior Mobile Security Engineer
Entity: CyberSentinel Solutions LTD
Status: Draft Audit Plan v1.0