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Questions and Answers
What is a common security risk in inter-app communication?
What is a common security risk in inter-app communication?
- The sending app processes the received data without validating it
- The user processes the received data without validating it
- The receiving app processes the received data without validating it (correct)
- The operating system processes the received data without validating it
Which of the following is a way to allow a component to be called by other apps in Android?
Which of the following is a way to allow a component to be called by other apps in Android?
- Marking the component as private in AndroidManifest.xml
- Marking the component with android:exported="true" in AndroidManifest.xml (correct)
- Adding an intent-filter to the AndroidManifest.xml
- Removing the component from AndroidManifest.xml
What is a difference between inter-app communication in iOS and Android?
What is a difference between inter-app communication in iOS and Android?
- Android does not support URL-based communication
- In Android, the recipient app does not need to contain code to handle the incoming communication (correct)
- iOS does not support inter-app communication
- iOS only supports explicit call to an Activity in another app
What is a potential security risk of inter-app communication?
What is a potential security risk of inter-app communication?
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What is a requirement for an app to receive inter-app communication in iOS?
What is a requirement for an app to receive inter-app communication in iOS?
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What is a way to call an Activity or Service in another app in Android?
What is a way to call an Activity or Service in another app in Android?
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Study Notes
Inter-App Communication
- Both iOS and Android support inter-app communication between different apps
- Both platforms support URL-based communication
- Android also allows explicitly calling an Activity in another app
Risks of Inter-App Communication
- Receiving app may process received data without validation
- App may offer inter-app communication "accidentally", allowing unauthorized access
- Less likely in iOS, as recipient app must contain code to handle incoming communication
- More likely in Android, requiring only minimal configuration in AndroidManifest.xml
- Malicious apps can hijack inter-app communication, potentially exposing sensitive data
Inter-App Communication in Android
- Activity, Service, or Content Provider must be registered in AndroidManifest.xml
- To allow component to be called by other apps, one of two methods can be used:
- Mark component with
android:exported="true"in AndroidManifest.xml - Add an intent-filter to the component, defining a URL scheme or action
- Mark component with
- Incorrectly exposing Activities or Services can have negative security implications
- Example: Exposing an e-banking app's post-login Activity can allow unauthorized access to app functionality
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