Analyzing iOS App Security with Objection

What Is This

Analyzing iOS App Security with Objection is a technical skill focused on the runtime assessment of iOS applications using Objection-a powerful, Frida-based toolkit designed for dynamic mobile application analysis. Objection enables security testers to interact with the internals of iOS apps directly on the device, without requiring a jailbroken environment. With this skill, testers can perform comprehensive evaluations of an app’s security posture, including keychain inspection, filesystem exploration, runtime manipulation, and bypassing client-side security controls.

Objection leverages the Frida instrumentation framework to inject scripts into running applications, which allows for real-time inspection and modification of app behaviors. This approach is particularly valuable for penetration testers and mobile security analysts who need to test the resilience of iOS applications against various attack scenarios.

Why Use It

iOS applications are often targeted by attackers seeking to exploit client-side vulnerabilities, access sensitive data, or bypass security controls. Traditional static analysis techniques can uncover some issues, but many critical vulnerabilities only become apparent during runtime. Objection bridges this gap by providing a dynamic analysis environment:

• No Jailbreak Required: Objection works on non-jailbroken devices, lowering operational risk and increasing applicability in real-world testing scenarios.
• Runtime Security Exploration: Analyze how the app behaves in real time, uncovering issues that are invisible to static code analysis.
• Bypass Security Controls: Test the robustness of SSL pinning, jailbreak detection, and other client-side protections by attempting to bypass them at runtime.
• Sensitive Data Exposure: Identify keychain leaks, insecure file storage, and other privacy concerns by directly querying the app’s data stores.
• OWASP Mobile Compliance: Address key OWASP Mobile Security Testing Guide controls by validating app responses to runtime threats.

How to Use It

Prerequisites

• macOS with Xcode and command-line tools
• Python 3.x
• Frida and Objection installed (see Objection GitHub for installation instructions)
• A test iOS device or simulator
• IPA (iOS app binary) file for the target application
• Authorization to test the application

Installation

Install Frida and Objection via Python's pip:

pip3 install frida-tools
pip3 install objection

Preparing the Application

For dynamic analysis on non-jailbroken devices, you must re-sign the IPA with a valid provisioning profile and inject the Frida gadget. On jailbroken devices, you can use Frida directly.

Example:

Re-signing the App (Non-jailbroken device)

## Unzip the .ipa
unzip TargetApp.ipa

## Inject Frida gadget (using tools like insert_dylib or patching tools)

## Re-sign the app with your provisioning profile
codesign -fs "iPhone Developer: Your Name (TeamID)" Payload/TargetApp.app

Launching Objection

Start the app on your device or simulator, then attach Objection:

objection --gadget <app.bundle.identifier> explore

On a jailbroken device, you can also launch and explore in a single step:

objection -g <app.bundle.identifier> explore

Common Objection Commands

Once in the Objection shell, you can perform a variety of runtime tasks. Some key commands include:

• Bypassing Jailbreak Detection

  bash

  ios jailbreak disable

• Bypassing SSL Pinning

  bash

  ios sslpinning disable

• Dumping Keychain Items

  bash

  ios keychain dump

• Exploring Filesystem Storage

  bash

  ios files list
  ios files download <path>

• Inspecting Runtime Classes and Methods

  bash

  ios classes
  ios methods <class_name>

• Evaluating App Memory

  bash

  memory search <string>
  memory list modules

Example:

Dumping All Keychain Items

objection --gadget com.example.app explore
## In the Objection shell:
ios keychain dump

This command will output all keychain items the application has access to, which can highlight sensitive data exposures.

When to Use It

Apply this skill in the following scenarios:

• Authorized Penetration Testing: When you have explicit permission to test an organization’s iOS app, especially in pre-release or test environments.
• Security Control Validation: To verify the effectiveness of client-side controls like SSL pinning, jailbreak detection, or code obfuscation.
• Sensitive Data Auditing: When checking for improper storage of credentials, tokens, or PII within the app’s keychain or filesystem.
• OWASP Mobile Top 10 Assessments: To satisfy dynamic testing requirements for mobile application security standards.

Do not use this skill on production devices or live user data without explicit authorization, as runtime modification may trigger security monitoring systems or violate policy.

Important Notes

• Authorization Required: Always ensure you have written permission before testing any application. Unauthorized use may violate legal and ethical guidelines.
• Potential Side Effects: Objection modifies application runtime behavior, which may interfere with app stability or trigger detection mechanisms.
• Non-jailbreak Limitations: Full functionality may require jailbroken devices, although Objection supports non-jailbroken testing through Frida gadget injection.
• Keep Tools Updated: Objection and Frida are actively developed. Ensure you use the latest versions for compatibility with the latest iOS versions.
• Responsible Disclosure: Report any vulnerabilities discovered during testing responsibly, in accordance with your client’s disclosure policy.

By mastering this skill, security professionals can perform in-depth, real-time analysis of iOS application security, identifying weaknesses that static tools may overlook and supporting the secure development of mobile software.