Apple iOS must implement the management setting: Encrypt iTunes backups.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-78409	AIOS-11-011100	SV-93115r1_rule		Medium

Description
When syncing an Apple iOS device to a computer running iTunes, iTunes will prompt the user to back up the Apple iOS device. If the performed backup is not encrypted, this could lead to the unauthorized disclosure of DoD-sensitive information if non-DoD personnel are able to access that machine. By forcing the backup to be encrypted, this greatly mitigates the risk of compromising sensitive data. iTunes backup and USB connections to computers are not authorized, but this control provides defense-in-depth for cases in which a user violates policy either intentionally or inadvertently. SFR ID: FMT_SMF_EXT.1.1 #47

Description

When syncing an Apple iOS device to a computer running iTunes, iTunes will prompt the user to back up the Apple iOS device. If the performed backup is not encrypted, this could lead to the unauthorized disclosure of DoD-sensitive information if non-DoD personnel are able to access that machine. By forcing the backup to be encrypted, this greatly mitigates the risk of compromising sensitive data. iTunes backup and USB connections to computers are not authorized, but this control provides defense-in-depth for cases in which a user violates policy either intentionally or inadvertently. SFR ID: FMT_SMF_EXT.1.1 #47

STIG	Date
Apple iOS 11 Security Technical Implementation Guide	2017-12-14

Details

Check Text ( C-77971r1_chk )
Review configuration settings to confirm "Force encrypted backups" is enabled. 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 Apple iOS management tool, verify "Force encrypted backups" is checked. Alternatively, verify the text "forceEncryptedBackup" appears in the configuration profile (.mobileconfig file). On the Apple iOS device: 1. Open the Settings app. 2. Tap "General". 3. Tap "Profiles & Device Management". 4. Tap the Configuration Profile from the Apple iOS management tool containing the restrictions policy. 5. Tap "Restrictions". 6. Verify "Encrypted backups enforced" is listed. If "Force encrypted backups" is unchecked in the Apple iOS management tool, or "forceEncryptedBackup" appears in the configuration profile, or the restrictions policy on the Apple iOS device from the Apple iOS management tool does not list "Encrypted backups enforced", this is a finding.

Check Text ( C-77971r1_chk )

Review configuration settings to confirm "Force encrypted backups" is enabled.

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 Apple iOS management tool, verify "Force encrypted backups" is checked.

Alternatively, verify the text "forceEncryptedBackup" appears in the configuration profile (.mobileconfig file).

On the Apple iOS device:
1. Open the Settings app.
2. Tap "General".
3. Tap "Profiles & Device Management".
4. Tap the Configuration Profile from the Apple iOS management tool containing the restrictions policy.
5. Tap "Restrictions".
6. Verify "Encrypted backups enforced" is listed.

If "Force encrypted backups" is unchecked in the Apple iOS management tool, or "forceEncryptedBackup" appears in the configuration profile, or the restrictions policy on the Apple iOS device from the Apple iOS management tool does not list "Encrypted backups enforced", this is a finding.

Fix Text (F-85141r1_fix)
Install a configuration profile to force encrypted backups to iTunes.