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What is Mobile application security?

What mobile application security is, how Android and iOS apps are attacked through their code, storage and APIs, and how to test them.

01Introduction

A mobile app ships its code to every attacker who downloads it. Anything inside the package, from API keys to hidden endpoints, can be extracted, and every call it makes to your backend can be replayed without the app at all.

02What is Mobile application security?

Mobile application security is the practice of protecting Android and iOS apps and the backends they talk to, guided by the OWASP Mobile Application Security Verification Standard (MASVS) and the OWASP Mobile Top 10.

It combines SAST on Kotlin, Java and Swift source, dynamic testing of the app on a device, and API security testing of the services behind it, where most serious mobile findings actually live.

03How Mobile application security works

Mobile testing covers the app and what it trusts.

1.
Static review
Decompile or review source for hardcoded secrets, insecure crypto, exported components and weak WebView settings.
2.
Dynamic analysis
Run the app on a device or emulator, intercept traffic and inspect local storage and logs.
3.
Backend testing
Replay and modify API calls to test authorization independent of the client.
4.
Platform checks
Review permissions, deep links, certificate pinning and inter-app communication.

04Threats and risks

Mobile risks cluster around trust in the client.

Embedded secrets
API keys and tokens extracted from the app package in minutes.
Client-side checks
Authorization or pricing enforced in the app instead of the server.
Insecure storage
Tokens and personal data left in plain files, shared preferences or backups.
Exported components
Android activities and intents that other apps can invoke directly.

05How Parameter helps

Parameter tests the app, its code and its backend together.

Android pentesting
Android penetration testing covers the app on device and every API it calls.
Kotlin and Java review
Sentinel reviews mobile source in pull requests, catching secrets and unsafe components before release.
Backend authorization
Agents replay mobile API calls as other users to find the IDOR the client was hiding.