MASWE-0008: Missing Device Secure Lock Verification Implementation

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Initial Description or Hints

The app may not check for a secure device lock (e.g. device passcode) and may allow for unauthorized access to sensitive data. On iOS enforcing device lock security (i.e., ensuring a passcode is set) has an additional benefit which is that it is tightly coupled with data encryption, assuming the app leverages the correct data protection APIs.

Relevant Topics

• user set a device passcode via isDeviceSecure() on Android better than only ensuring that the secure screen lock is set via KeyguardManager.isKeyguardSecure()
• before attempting to authenticate, test to make sure that you actually have the ability to do so by calling the LAContext.canEvaluatePolicy(_:error:) method on iOS
• to make sure that biometrics can be used, verify that the kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly or the kSecAttrAccessibleWhenPasscodeSet protection class is set when the SecAccessControlCreateWithFlags method is called

References

• https://developer.apple.com/documentation/localauthentication/logging_a_user_into_your_app_with_face_id_or_touch_id
• https://grep.app/search?q=isdevicesecure%28&filter[repo][0]=threema-ch/threema-android
• https://developer.android.com/reference/android/hardware/biometrics/BiometricManager#canAuthenticate(int)

MASTG v1 Coverage

• MASTG-TEST-0064 - Testing Local Authentication (ios)
• MASTG-TEST-0012 - Testing the Device-Access-Security Policy (android)
• MASTG-TEST-0017 - Testing Confirm Credentials (android)

Tests

MASTG-TEST-0248: References to APIs for Detecting Secure Screen Lock MASTG-TEST-0246: Runtime Use of Secure Screen Lock Detection APIs MASTG-TEST-0249: Runtime Use of Secure Screen Lock Detection APIs MASTG-TEST-0247: References to APIs for Detecting Secure Screen Lock