From Samsung Android OS 6 (with KNOX 2.x) Security Technical Implementation Guide
Part of PP-MDF-201008
Associated with: CCI-000062 CCI-000366
Many mobile devices display notifications on the lock screen so users can obtain relevant information in a timely manner without having to frequently unlock the phone to determine if there are new notifications. However, in many cases, these notifications can contain sensitive information. When they are available on the lock screen, an adversary can see them merely by being in close physical proximity to the device. Configuring the mobile operating system to not send notifications to the lock screen mitigates this risk.
This check procedure is performed on both the MDM Administration Console and the Samsung KNOX device. Check that the appropriate setting is configured on the MDM Administration Console. 1. Ask the MDM administrator to display the "Notifications on lock screen" settings in the "Android Restrictions" rule. 2. Verify that the "Hide content" or "Do not show notification" setting is enabled and "Show content" setting is disabled. On the Samsung KNOX for Android device: 1. Lock the device while there are notifications shown in the notification bar. 2. Turn the display on and verify that notification contents are hidden ("Hide content") or that no notifications are shown ("Do not show notification") on the lock screen. If the "Show content" setting in the MDM console is enabled, or if the user is able to see notification content on the device lock screen, this is a finding.
Configure the mobile operating system to not display notifications when the device is locked. Configure the platform to disable notifications on the lock screen or hide notification details on the lock screen. On the MDM Administration Console, enable "Hide content" or "Do not show notification" and disable "Show content" in the "Notifications on lock screen" setting in the "Android Restrictions" rule.
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