Apple iOS/iPadOS must not allow backup of managed app data to locally connected systems.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-97441	AIOS-13-004000	SV-106545r1_rule		Medium

Description
Data on mobile devices is protected by numerous mechanisms, including user authentication, access control, and cryptography. When the data is backed up to an external system (either locally connected or cloud-based), many if not all of these mechanisms are no longer present. This leaves the backed-up data vulnerable to attack. Disabling backup to external systems mitigates this risk. SFR ID: FMT_SMF_EXT.1.1 #40

Description

Data on mobile devices is protected by numerous mechanisms, including user authentication, access control, and cryptography. When the data is backed up to an external system (either locally connected or cloud-based), many if not all of these mechanisms are no longer present. This leaves the backed-up data vulnerable to attack. Disabling backup to external systems mitigates this risk. SFR ID: FMT_SMF_EXT.1.1 #40

STIG	Date
Apple iOS/iPadOS 13 Security Technical Implementation Guide	2019-09-23

Details

Check Text ( C-96277r1_chk )
Review configuration settings to confirm backup in management apps is disabled and "Encrypt local backup" in iTunes (for Windows computer) and in Finder on Mac. Note: iTunes Backup/Finder backup is implemented by the configuration policy rule "Force encrypted backups", which is included in AIOS-13-010800, and therefore, not included in the procedure below. This check procedure is performed on both the Apple iOS/iPadOS management tool and the iPhone and iPad. 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/iPadOS management tool, verify backing up app data is disabled. On the iPhone and iPad: 1. Open the Settings app. 2. Tap "General". 3. Tap "Profiles & Device Management". 4. Tap the Configuration Profile from the Apple iOS/iPadOS management tool containing the restrictions policy. 5. Tap "Apps". 6. Tap a "managed app". 7. Verify "App data will not be backed up" is listed. Note: Steps 6 and 7 must be performed for each managed app. If backing up app data is not disabled in the Apple iOS/iPadOS management tool or "app data will not be backed up" is not listed for each managed app on the iPhone and iPad, this is a finding.

Check Text ( C-96277r1_chk )

Review configuration settings to confirm backup in management apps is disabled and "Encrypt local backup" in iTunes (for Windows computer) and in Finder on Mac.

Note: iTunes Backup/Finder backup is implemented by the configuration policy rule "Force encrypted backups", which is included in AIOS-13-010800, and therefore, not included in the procedure below.

This check procedure is performed on both the Apple iOS/iPadOS management tool and the iPhone and iPad.

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/iPadOS management tool, verify backing up app data is disabled.

On the iPhone and iPad:
1. Open the Settings app.
2. Tap "General".
3. Tap "Profiles & Device Management".
4. Tap the Configuration Profile from the Apple iOS/iPadOS management tool containing the restrictions policy.
5. Tap "Apps".
6. Tap a "managed app".
7. Verify "App data will not be backed up" is listed.
Note: Steps 6 and 7 must be performed for each managed app.

If backing up app data is not disabled in the Apple iOS/iPadOS management tool or "app data will not be backed up" is not listed for each managed app on the iPhone and iPad, this is a finding.

Fix Text (F-103121r2_fix)
Install a configuration profile to disable backup of managed apps.