From Apple iOS 12 Security Technical Implementation Guide
Part of PP-MDF-301030
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.
Review configuration settings to confirm the screen lock timeout is set to 15 minutes or less.
This check procedure is performed on both the Apple iOS management tool and the Apple iOS device.
Note: If an organization has multiple configuration profiles, the check procedure must be performed on the relevant configuration profiles applicable to the scope of the review.
In the management tool, verify the sum of the values assigned to "Maximum Auto-Lock time" and "Grace period for device lock" is between 1 and 15 minutes.
Alternatively, locate the text "
Install a configuration profile to lock the device display after 15 minutes (or less) of inactivity. This is done by setting "Maximum Auto-Lock time" and "Grace Period for device lock" so the sum of their values is between 1 and 15 minutes.
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