How Can We Secure a Mobile App's API Against Request Sniffing Attacks?

Securing an API REST for Mobile App When Sniffing Requests Provides the Key

Introduction

Despite authentication methods like API Basic Authentication, API Keys, and OAuth 2.0, hackers can often sniff requests on mobile apps to expose the "key" used for authentication. This gives them access to the API as if they were using the app. So, is there a way to secure an API used by a mobile app?

The Difference Between "What" and "Who"

When authenticating an API request, it's important to differentiate between "what" is making the request (the mobile app) and "who" is accessing the API (the user).

Impersonating the Mobile App

Attackers can easily extract auth keys from mobile apps using a proxy, allowing them to impersonate the app and make API calls.

Hardening and Shielding the Mobile App

Mobile hardening and shielding solutions attempt to prevent compromised devices and modified apps from accessing the API. However, these solutions are not foolproof and can be bypassed.

Securing the API Server

• Basic Defenses: HTTPS, API keys, user agents, CAPTCHA, and IP addresses can be used for basic API protection.
• Advanced Defenses: API keys, HMAC, OAuth, and certificate pinning can enhance security.
• External Solutions: reCAPTCHA V3, Web Application Firewall (WAF), and User Behavior Analytics (UBA) can further improve API security.
• Mobile App Attestation: This solution verifies the integrity of the mobile app and device before allowing API access, eliminating the need for API keys in the app.

Going the Extra Mile

• OWASP Mobile Security Testing Guide: Provides guidelines for mobile app security testing.
• OWASP API Security Top 10: Outlines common API security risks and mitigation strategies.

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