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Mitigation Strategies Analysis for jdg/mbprogresshud

Mitigation Strategy: Input Validation and Sanitization (for HUD Text)

Description:

  1. Centralized Control: Create a single function or class method responsible for setting the text on any MBProgressHUD instance (e.g., labelText, detailsLabelText). This function will be the only place where text is assigned to these properties.
  2. Validation: Within this centralized function, before setting the text on the MBProgressHUD, validate it:
    • Type Check: Ensure the input is a string.
    • Length Limits: Enforce maximum length restrictions. Example: 256 characters for labelText, 512 for detailsLabelText. Adjust based on your UI.
    • Character Whitelisting/Blacklisting (Optional, but recommended): If possible, define allowed characters (whitelist) or disallowed characters (blacklist). Whitelist is preferred. For example, you might disallow control characters.
  3. Sanitization (If Necessary): If you cannot strictly control the input (e.g., user-generated content), sanitize the text within the centralized function:
    • Escaping/Encoding: While less critical for MBProgressHUD's display (it's not a web view), consider escaping or encoding if the same text is used elsewhere in your app where it could be misinterpreted (e.g., HTML).
  4. Direct MBProgressHUD API Use: Always use the MBProgressHUD API methods (e.g., hud.labelText = ...) to set the text. Do not attempt to manipulate the underlying UI elements directly.
  5. Testing: Thoroughly test this centralized function with various inputs, including edge cases and potentially problematic strings.

Threats Mitigated:

  • UI Disruption/Corruption (Severity: Low): Malicious or excessively long strings could cause the HUD to display incorrectly.
  • Information Disclosure (Severity: Low): Unlikely with MBProgressHUD alone, but carefully crafted input might reveal some internal state if the text is derived from sensitive data.

Impact:

  • UI Disruption/Corruption: Significantly reduced.
  • Information Disclosure: Reduced (already low risk).

Currently Implemented:

  • Partially implemented in NetworkManager.swift in the fetchData function. Length limits are enforced, but character validation is missing.

Missing Implementation:

  • Character validation is missing. A truly centralized function for setting all HUD text is not yet implemented. The parseUserDetails function in User.swift lacks validation.

Mitigation Strategy: Denial of Service (DoS) - UI Unresponsiveness (via HUD)

Description:

  1. Centralized HUD Manager: Create a single class or utility (e.g., HUDManager) responsible for all MBProgressHUD showing and hiding. This class should:
    • Have a state variable (e.g., isHUDVisible) to track if a HUD is currently shown.
    • Provide methods like showLoadingHUD(withText:timeout:) and hideLoadingHUD().
    • Prevent multiple simultaneous HUD displays by checking isHUDVisible before showing.
  2. Timeout Enforcement: Always use MBProgressHUD's hide:animated:afterDelay: method within the HUDManager to set a timeout for every HUD display. A reasonable timeout (e.g., 5-10 seconds) should be used, adjusted based on the expected task duration.
  3. Asynchronous Operations (with HUD Handling): Ensure that any long-running operation that triggers the HUD is on a background thread. The HUDManager should handle showing the HUD before starting the background task and hiding it in the task's completion handler (both success and failure cases). Use DispatchQueue.global().async or similar.
  4. Direct API Use: Only use MBProgressHUD's methods (e.g., showHUDAddedTo:animated:, hide:animated:) within the HUDManager. Do not manipulate the HUD directly from elsewhere in the code.
  5. Testing: Thoroughly test the HUDManager, including scenarios where operations take longer than the timeout, fail, or are cancelled.

Threats Mitigated:

  • UI Unresponsiveness (Severity: Medium): Prevents the HUD from being displayed indefinitely, blocking user interaction.

Impact:

  • UI Unresponsiveness: Significantly reduced.

Currently Implemented:

  • Timeouts are implemented in some network requests (NetworkManager.swift), but not consistently. A centralized HUDHelper.swift exists but is not fully utilized or robust.

Missing Implementation:

  • HUDHelper.swift needs refactoring to be a true, robust, centralized manager used everywhere a HUD is shown. Timeouts are missing in UI-related operations (e.g., ImageProcessor.swift).

Mitigation Strategy: Safe Custom View Usage (If Used)

Description:

  1. Avoidance (Primary): Do not use custom views with MBProgressHUD unless absolutely necessary. Use the built-in indicators and labels.
  2. Justification (If Used): If a custom view must be used, document the precise reason why the standard options are insufficient.
  3. Code Review (If Used): If a custom view is used, its code must undergo a thorough security review, focusing on potential vulnerabilities.
  4. Minimal Functionality (If Used): The custom view should be as simple as possible. Avoid any complex logic or user interaction within the custom view.
  5. Data Isolation (If Used): Pass only the absolute minimum necessary data to the custom view. Avoid giving it access to sensitive data or application functionality.
  6. Direct API Use (If Used): Use MBProgressHUD's customView property correctly. Do not attempt to add the custom view directly to the view hierarchy.
  7. Testing (If Used): Extensively test the custom view, including security testing.

Threats Mitigated:

  • Arbitrary Code Execution (Severity: High - if a vulnerability exists): A vulnerability in a custom view could allow code execution.
  • Data Leakage (Severity: Medium to High): Depends on the data the custom view accesses.
  • UI Manipulation (Severity: Low to Medium): A compromised custom view could alter the UI.

Impact:

  • Arbitrary Code Execution: Risk significantly reduced by avoiding custom views or through rigorous review.
  • Data Leakage: Risk reduced by minimizing data access.
  • UI Manipulation: Risk reduced by keeping the custom view simple.

Currently Implemented:

  • No custom views are currently used.

Missing Implementation:

  • N/A - No custom views are used. If introduced, all these steps are mandatory.