Windows Phone 8.1 must be configured to implement the management setting: Disable the capability for a user to manually unenroll from MDM management.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-58959	MSWP-81-500903	SV-73389r1_rule		Medium

Description
The use of an MDM allows an organization to assign values to security-related parameters across all the devices it manages. This provides assurance that the required mobile OS security controls are being enforced and that the device user or an adversary has not modified or disabled the controls. If a user has the ability on their device to manually unenroll from MDM management, this removes all IA controls and exposes the device and the user to a number of threat vectors and takes them out of compliance. Disabling this feature mitigates the risk from loss of control and ensures that the devices maintain the required locked down state. SFR ID: FMT_SMF.1.1 #42

Description

The use of an MDM allows an organization to assign values to security-related parameters across all the devices it manages. This provides assurance that the required mobile OS security controls are being enforced and that the device user or an adversary has not modified or disabled the controls. If a user has the ability on their device to manually unenroll from MDM management, this removes all IA controls and exposes the device and the user to a number of threat vectors and takes them out of compliance. Disabling this feature mitigates the risk from loss of control and ensures that the devices maintain the required locked down state. SFR ID: FMT_SMF.1.1 #42

STIG	Date
Microsoft Windows Phone 8.1 Security Technical Implementation Guide	2015-03-26

Details

Check Text ( C-59789r1_chk )
This validation procedure is performed on both the MDM administration console and the Windows Phone mobile device. It assumes you have an existing device time-out policy in place that will lock the device after a certain period. On the MDM administration console: 1. Ask the MDM administrator to verify the phone compliance policy. 2. Find the setting for "allow user to manually unenroll from management". 3. Verify that setting restriction is turned off/disallowed. On the Windows Phone mobile device: 1. Go to "settings". 2. Tap on "workplace". 3. Look at the bottom of the screen to see if there is a company/agency name with the small text of "enrolled" under it. 4. Tap on that enrollment name; that should take you to a new page with details about the enrollment and have a refresh and wastebasket icon at the bottom. 5. Tap on the wastebasket (delete) icon to unenroll from MDM management. A message box should come up with a "Can't delete account" alert. If the MDM does not disable the policy setting for "allow user to manually unenroll from management" or, if, on the phone, a message starting with the sentence "Can't delete account" is not shown when tapping on the wastebasket icon in the workplace app, this is a finding.

Check Text ( C-59789r1_chk )

This validation procedure is performed on both the MDM administration console and the Windows Phone mobile device. It assumes you have an existing device time-out policy in place that will lock the device after a certain period.

On the MDM administration console:
1. Ask the MDM administrator to verify the phone compliance policy.
2. Find the setting for "allow user to manually unenroll from management".
3. Verify that setting restriction is turned off/disallowed.

On the Windows Phone mobile device:
1. Go to "settings".
2. Tap on "workplace".
3. Look at the bottom of the screen to see if there is a company/agency name with the small text of "enrolled" under it.
4. Tap on that enrollment name; that should take you to a new page with details about the enrollment and have a refresh and wastebasket icon at the bottom.
5. Tap on the wastebasket (delete) icon to unenroll from MDM management. A message box should come up with a "Can't delete account" alert.

If the MDM does not disable the policy setting for "allow user to manually unenroll from management" or, if, on the phone, a message starting with the sentence "Can't delete account" is not shown when tapping on the wastebasket icon in the workplace app, this is a finding.

Fix Text (F-64353r2_fix)
Configure the MDM system with a security policy that requires the "allow user to manually unenroll from management" capability to be disabled for Windows Phone devices. Deploy the MDM policy to managed devices.