How to Protect iOS Apps from Jailbreak Detection Bypass Tools

Last updated November 29, 2023 by Appdome

Learn to Block Jailbreak Bypass Tools in iOS apps, in mobile CI/CD with a Data-Driven DevSecOps™ build system.

What is iOS Jailbreak Bypass?

Hackers use Jailbreak Bypass and Jailbreak Hiding tools to evade Jailbreak detection/protections. As Jailbreaking makes it easier to hack iOS apps and to compromise the mobile security model, when a mobile app is protected with Jailbreak detection or Jailbreak protection, hackers will try to either bypass the protection or hide the fact that the device is Jailbroken.

Evading detection allows hackers to operate in a Jailbreak state longer and to complete or continue the activity they used Jailbreak to achieve in the first place, such as:
• Playing the game for free longer
• Using more advanced or automated tools like emulators to modify in-app purchases
• Use FRIDA to inject malicious code
• Use IDA-Pro to create a call graph to trace the app’s source code
• Modify app workflows
• Send fake signals to unsuspecting users, to make the hackers’ attacks seem more legitimate/credible

Why Block Jailbreak Bypass Tools in iOS Apps?

Hackers combine Jailbreak tools with Jailbreak bypass tools to kill two birds with one stone. For example, hackers combine the use of Jailbreak tools like CheckRa1n, Unc0ver, Zylon, PlankFilza, and Chimera (which they use to Jailbreak iOS), alongside special-purpose Jailbreak Bypass or Jailbreak hiding tools like FlyJB, JailProtect, Liberty Lite, TweakRestrictor, and KernBypass. The first set of tools is used for achieving Jailbreak state, while the second set of tools is used for concealing that the device is Jailbroken or to bypass Jailbreak protection/detection mechanisms in the app. Appdome identifies all tools used for jailbreak or jailbreak bypass. When detecting that it is running on a Jailbroken device, the Appdome-secured app will shut itself down (default behavior) after displaying a message to the mobile user, thereby protecting that app, user, and mobile data from being compromised or attacked.

Prerequisites for Using Block Jailbreak Bypass Tools:

To use Appdome’s mobile app security build system to Block Jailbreak Bypass Tools , you’ll need:

Block Jailbreak Bypass Tools on iOS apps using Appdome

On Appdome, follow these 3 simple steps to create self-defending iOS Apps that Block Jailbreak Bypass Tools without an SDK or gateway:

  1. Upload the Mobile App to Appdome.

    1. Upload an app to Appdome’s Mobile App Security Build System

    2. Upload Method: Appdome Console or DEV-API
    3. iOS Formats: .ipa
    4. Block Jailbreak Bypass Tools Compatible With: Obj-C, Java, Swift, Flutter, React Native, Unity, Xamarin, Cordova and more
  2. Build the feature: Block Jailbreak Bypass Tools.

    1. Building Block Jailbreak Bypass Tools by using Appdome’s DEV-API:

      1. Create and name the Fusion Set (security template) that will contain the Block Jailbreak Bypass Tools feature as shown below:
      2. fusion set that contains Block Jailbreak Bypass Tools

        Figure 1: Fusion Set that will contain the Block Jailbreak Bypass Tools feature
        Note: Naming the Fusion Set to correspond to the protection(s) selected is for illustration purposes only (not required).

      3. Follow the steps in Sections 2.2.1-2.2.2 of this article, Building the Block Jailbreak Bypass Tools feature via Appdome Console, to add the Block Jailbreak Bypass Tools feature to this Fusion Set.

      4. Open the Fusion Set Detail Summary by clicking the “...” symbol on the far-right corner of the Fusion Set, as shown in Figure 1 above, and get the Fusion Set ID from the Fusion Set Detail Summary (as shown below): fusion Set Detail Summary image

        Figure 2: Fusion Set Detail Summary
        Note: Annotating the Fusion Set to identify the protection(s) selected is optional only (not mandatory).

      5. Follow the instructions below to use the Fusion Set ID inside any standard mobile DevOps or CI/CD toolkit like Bitrise, App Center, Jenkins, Travis, Team City, Circle CI or other system:
        1. Build an API for the app – for instructions, see the tasks under Appdome API Reference Guide
        2. Look for sample APIs in Appdome’s GitHub Repository
    2. Building the Block Jailbreak Bypass Tools feature via Appdome Console

      To build the Block Jailbreak Bypass Tools protection by using Appdome Console, follow the instructions below.

      1. Where: Inside the Appdome Console, go to Build > Anti Fraud Tab > Mobile Malware Prevention section.
      2. When you select the Block Jailbreak Bypass Tools you'll notice that your Fusion Set you created in step 2.1.1 now bears the icon of the protection category that contains Block Jailbreak Bypass Tools

        Fusion Set applied Block Jailbreak Bypass Tools

        Figure 4: Fusion Set that displays the newly added Block Jailbreak Bypass Tools protection

      3. Select the Threat-Event™ in-app mobile Threat Defense and Intelligence policy for Block Jailbreak Bypass Tools:
        1. Threat-Events™ OFF > In-App Defense

          If the Threat-Events™ setting is cleared (not selected). Appdome will detect and defend the user and app by enforcing Block Jailbreak Bypass Tools.

        2. Threat-Events™ ON > In-App Detection

          When this setting is used, Appdome detects tools which try to hide that your device is jailbroken and passes Appdome’s Threat-Event™ attack intelligence to the app’s business logic for processing, enforcement, and user notification. For more information on consuming and using Appdome Threat-Events™ in the app, see section Using Threat-Events™ for Block Jailbreak Bypass Tools Intelligence and Control in Mobile Apps.

        3. Threat-Events™ ON > In-App Defense

          When this setting is used, Appdome detects and defends against Jailbreak Bypass Tools (same as Appdome Enforce) and passes Appdome’s Threat-Event™ attack intelligence the app’s business logic for processing. For more information on consuming and using Appdome Threat-Events™ in the app, see section Using Threat-Events™ for Block Jailbreak Bypass Tools Intelligence and Control in Mobile Apps.

      4. Click Build My App at the bottom of the Build Workflow (shown in Figure 3).
    Congratulations!  The Block Jailbreak Bypass Tools protection is now added to the mobile app

Using Threat-Events™ for Jailbreak Bypass Tools Intelligence and Control in iOS Apps

Appdome Threat-Events™ provides consumable in-app mobile app attack intelligence and defense control when Jailbreak Bypass Tools are detected. To consume and use Threat-Events™ for Jailbreak Bypass Tools in iOS Apps, use AddObserverForName in Notification Center, and the code samples for Threat-Events™ for Jailbreak Bypass Tools shown below.

The specifications and options for Threat-Events™ for Jailbreak Bypass Tools are:

Threat-Event™ Elements Block Jailbreak Bypass Tools Method Detail
Appdome Feature Name Block Jailbreak Bypass Tools
Threat-Event Mode
OFF, IN-APP DEFENSE Appdome detects, defends and notifies user (standard OS dialog) using customizable messaging.
ON, IN-APP DETECTION Appdome detects the attack or threat and passes the event in a standard format to the app for processing (app chooses how and when to enforce).
ON, IN-APP DEFENSE Uses Appdome Enforce mode for any attack or threat and passes the event in a standard format to the app for processing (gather intel on attacks and threats without losing any protection).
Certified Secure™ Threat Event Check
Visible in ThreatScope™
Developer Parameters for Blocking Jailbreak Bypass Tools Threat-Event™
Threat-Event NAME JailbreakBypassDetected
Threat-Event DATA reasonData
Threat-Event CODE reasonCode
Threat-Event REF 6924
Threat-Event SCORE
currentThreatEventScore Current Threat-Event score
threatEventsScore Total Threat-events score
Threat-Event Context Keys
message Message displayed for the user on event
externalID The external ID of the event which can be listened via Threat Events
osVersion OS version of the current device
deviceModel Current device model
deviceManufacturer The manufacturer of the current device
fusedAppToken The task ID of the Appdome fusion of the currently running app
kernelInfo Info about the kernel: system name, node name, release, version and machine.
carrierPlmn PLMN of the device
deviceID Current device ID
reasonCode Reason code of the occured event
buildDate Appdome fusion date of the current application
devicePlatform OS name of the current device
carrierName Carrier name of the current device
updatedOSVersion Is the OS version up to date
timeZone Time zone
deviceFaceDown Is the device face down
locationLong Location longitude conditioned by location permission
locationLat Location latitude conditioned by location permission
locationState Location state conditioned by location permission
wifiSsid Wifi SSID
wifiSsidPermissionStatus Wifi SSID permission status
reason Detection cause
data Detection cause data

With Threat-Events™ enabled (turned ON), iOS developers can get detailed attack intelligence and granular defense control in iOS applications and create amazing user experiences for all mobile end users when Jailbreak Bypass Tools are detected.

The following is a code sample for native iOS apps, which uses all values in the specification above for Block Jailbreak Bypass Tools:


Using Appdome, there are no development or coding prerequisites to build secured iOS Apps by using Block Jailbreak Bypass Tools. There is no SDK and no library to code or implement in the app and no gateway to deploy in your network. All protections are built into each app and the resulting app is self-defending and self-protecting.

Releasing and Publishing Mobile Apps with Block Jailbreak Bypass Tools

After successfully securing your app by using Appdome, there are several available options to complete your project, depending on your app lifecycle or workflow. These include:

Related Articles:

Check out the Appdome Mobile Malware Prevention solution page or request a demo at any time.

If you have any questions, please send them our way at support.appdome.com or via the chat window on the Appdome platform.

Thank you!

Thanks for visiting Appdome! Our mission is to secure every app on the planet by making mobile app security easy. We hope we’re living up to the mission with your project.

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