From Samsung Android OS 5 with Knox 2.0 Security Technical Implementation Guide
Part of PP-MDF-201003
Associated with: CCI-000057
The screen lock timeout must be set to a value that helps protect the device from unauthorized access. Having a too-long timeout would increase the window of opportunity for adversaries who gain physical access to the mobile device through loss, theft, etc. Such devices are much more likely to be in an unlocked state when acquired by an adversary, thus granting immediate access to the data on the mobile device. The maximum timeout period of 15 minutes has been selected to balance functionality and security; shorter timeout periods may be appropriate depending on the risks posed to the mobile device.
This validation procedure is performed on both the MDM Administration Console and the Samsung Knox for Android device. Check whether the appropriate setting is configured on the MDM Administration Console: 1. Ask the MDM administrator to display the "Max Time to Lock" setting in the "Android Password Restrictions" rule. 2. Verify the value of the setting is 15 minutes or less. On the Samsung Knox for Android device: 1. Unlock the device. 2. Refrain from performing any activity on the device for 15 minutes. 3. Verify the device requires the user to enter the device unlock password to access the device. Note: Max time to lock is the sum of the display screen timeout and the lock screen delay on the device. On MDM configuration, the device makes a choice for these settings so that the sum is 15 minutes or less. If the user does not have to unlock the device after 15 minutes of inactivity, this is a finding.
Configure the MOS to lock the device display after 15 minutes (or less) of inactivity. On the MDM Administration Console, configure the "Max Time to Lock" option to 15 minutes in the "Android Password Restrictions" rule.
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