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Attack Tree Analysis for baseflow/flutter-permission-handler

Objective: To gain unauthorized access to sensitive user data or device capabilities by exploiting vulnerabilities or misconfigurations in the flutter-permission-handler plugin or its implementation within a Flutter application.

Attack Tree Visualization

                                      [Attacker's Goal: Unauthorized Access]
                                                    |
                                                    |
        -------------------------------------------------------------------------
        |                                               |
[Sub-Goal 1: Bypass Permission Checks]      [Sub-Goal 2: Escalate Granted Permissions]
        |
        |-------------------------                      |-------------------------
        |                       |                      |                       |
[1.1 Incorrect Status]        |              [2.1 Misuse of APIs]
        |                                               |
        |                                               |
***[1.1.1 Misconfigured]***                   ***[2.1.1 Requesting]***
***[1.1.2 Developer Error]***                 ***[2.1.2 Ignoring]***

Attack Tree Path: Sub-Goal 1: Bypass Permission Checks

The attacker aims to circumvent the permission checks, gaining access to resources without proper authorization.

Attack Tree Path: 1.1 Incorrect Status Handling

The application incorrectly interprets or handles the permission status returned by the flutter-permission-handler plugin.

Attack Tree Path: 1.1.1 Misconfigured openAppSettings()

Description: The application misuses the openAppSettings() function. This could involve not checking the permission status after the user returns from the app settings, leading to an incorrect assumption about the permission state. The app might also direct the user to the wrong settings screen.

  • Likelihood: Low
  • Impact: Medium (user confusion, potential data leakage if the app proceeds without the permission)
  • Effort: Very Low
  • Skill Level: Novice
  • Detection Difficulty: Easy (detectable through user testing and code review)

Attack Tree Path: 1.1.2 Developer Error in Status Logic

Description: The developer introduces a logical error in the code that checks the permission status. This could be a simple mistake like inverting a boolean condition or using the wrong comparison operator, causing the app to proceed as if a permission is granted when it's actually denied or permanently denied.

  • Likelihood: Medium
  • Impact: Medium to High (depending on the specific permission and the nature of the error; could lead to unauthorized data access)
  • Effort: Very Low
  • Skill Level: Novice
  • Detection Difficulty: Medium (requires code review or dynamic analysis to identify the logical flaw)

Attack Tree Path: Sub-Goal 2: Escalate Granted Permissions

The attacker leverages legitimately granted permissions but uses them in a way that exceeds the intended scope or accesses unintended resources.

Attack Tree Path: 2.1 Misuse of Permission Handler APIs

The application incorrectly utilizes the plugin's API, leading to unintended consequences related to permissions.

Attack Tree Path: 2.1.1 Requesting Excessive Permissions

Description: The application requests more permissions than it strictly needs for its functionality. This increases the attack surface; if the application is compromised in some other way, the attacker gains access to more data or device capabilities than they would have if only necessary permissions were requested.

  • Likelihood: Medium
  • Impact: Medium (increases the potential damage from a successful compromise)
  • Effort: Very Low
  • Skill Level: Novice
  • Detection Difficulty: Easy (detectable through code review and by examining the app's permission requests)

Attack Tree Path: 2.1.2 Ignoring isLimited Status (iOS)

Description: Specifically on iOS, when requesting photo library access, the user can grant "limited" access, allowing the app to access only selected photos. If the application ignores the isLimited status and treats it as isGranted, it might attempt to access the entire photo library. This could lead to a crash or, if a further vulnerability exists, unauthorized access to all photos.

  • Likelihood: Low
  • Impact: Medium to High (potential for unauthorized access to a user's entire photo library)
  • Effort: Very Low
  • Skill Level: Novice
  • Detection Difficulty: Medium (requires code review and testing on iOS devices)