Overview

This test complements MASTG-TEST-0346. It monitors text input fields in the app at runtime to check if the app masks the text entry when the user enters sensitive data.

If the app does not mask text input fields that contain sensitive data, such data may be visible to bystanders (shoulder surfing) or captured in screenshots and screen recordings. Marking a field as secure also keeps it on the system keyboard: iOS does not offer installed third-party (custom) keyboards for secure fields (see MASTG-KNOW-0141), so they never receive the typed characters.

Ensure you exercise the app thoroughly, entering realistic sensitive data (for example, usernames, passwords, email addresses, credit card numbers, recovery codes) into each identified text input field.

Steps

  1. Use MASTG-TECH-0056 to install the app.
  2. Use MASTG-TECH-0095 to hook the relevant APIs.
  3. Exercise the app extensively to trigger as many flows as possible and enter sensitive data wherever you can.

Observation

The output should contain evidences that allow associating each text entry with the corresponding input field and its protection status. At minimum it should contain:

Evaluation

The test case fails if the app uses UI elements that do not allow masking text or if any text input field used containing sensitive data is found unmasked. For example, due to the following:

Note

It is not a failure if non-sensitive text input fields (for example, for a username or email address) are unmasked. Validating whether a text input field is used for sensitive data may require a review of the app's UI and business logic to determine the context in which the field is used.

Note

This test may produce false negatives if the app uses custom text input controls that do not rely on standard classes such as UITextField or SecureField (for example in custom UI frameworks or game engines, or if text entry is handled through nonstandard abstractions that prevent reliable observation of input traits at rest).

Propojené úkoly

Vazby
is related to MASTG-BEST-0044 Mask Sensitive Data in Text Input Fields (iOS)