STIGQter: STIG Summary: Apple iOS/iPadOS 14 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 23 Apr 2021:

Apple iOS/iPadOS must implement the management setting: enable USB Restricted Mode.

DISA Rule

SV-228767r619923_rule

Vulnerability Number

V-228767

Group Title

PP-MDF-991000

Rule Version

AIOS-14-010600

Severity

CAT II

CCI(s)

• CCI-000097 - The organization restricts or prohibits the use of organization-controlled portable storage devices by authorized individuals on external information systems.
• CCI-000366 - The organization implements the security configuration settings.
• CCI-000370 - The organization employs automated mechanisms to centrally manage configuration settings for organization-defined information system components.

Weight

10

Fix Recommendation

Install a configuration profile to disable the allow USB Restricted Mode in the management tool. This a supervised-only control.

Note: This control is called “Allow USB accessories while device is locked” in Apple Configurator and the control logic is opposite to what is listed here. Make sure the MDM policy rule is set correctly (to disable USB accessory connections when the device is locked).

Check Contents

This is a supervised-only control. If the iPhone or iPad being reviewed is not supervised by the MDM, this control is automatically a finding.

If the iPhone or iPad being reviewed is supervised by the MDM, review configuration settings to confirm "Allow USB Restricted Mode" is enabled.

This check procedure is performed on both the device management tool and the iPhone and iPad device.

Note: If an organization has multiple configuration profiles, then the check procedure must be performed on the relevant configuration profiles applicable to the scope of the review.

In the iOS management tool, verify "Allow USB Restricted Mode" is checked.

On the iPhone/iPad device:
1. Open the Settings app.
2. Tap "General".
3. Tap "Profiles & Device Management" or "Profiles".
4. Tap the Configuration Profile from the iOS management tool containing the restrictions policy.
5. Tap "Restrictions".
6. Verify "Allow USB Restricted Mode" is listed.

If "Allow USB Restricted Mode" is not enabled in both the management tool and on the Apple device, this is a finding.

Note: "Allow USB Restricted Mode" may be called “Allow USB accessories while device is locked” in some MDM consoles. The required logic is to disable USB accessory connections when the device is locked.

Vulnerability Number

V-228767

Documentable

False

Rule Version

AIOS-14-010600

Severity Override Guidance

This is a supervised-only control. If the iPhone or iPad being reviewed is not supervised by the MDM, this control is automatically a finding.

If the iPhone or iPad being reviewed is supervised by the MDM, review configuration settings to confirm "Allow USB Restricted Mode" is enabled.

This check procedure is performed on both the device management tool and the iPhone and iPad device.

Note: If an organization has multiple configuration profiles, then the check procedure must be performed on the relevant configuration profiles applicable to the scope of the review.

In the iOS management tool, verify "Allow USB Restricted Mode" is checked.

On the iPhone/iPad device:
1. Open the Settings app.
2. Tap "General".
3. Tap "Profiles & Device Management" or "Profiles".
4. Tap the Configuration Profile from the iOS management tool containing the restrictions policy.
5. Tap "Restrictions".
6. Verify "Allow USB Restricted Mode" is listed.

If "Allow USB Restricted Mode" is not enabled in both the management tool and on the Apple device, this is a finding.

Note: "Allow USB Restricted Mode" may be called “Allow USB accessories while device is locked” in some MDM consoles. The required logic is to disable USB accessory connections when the device is locked.

Check Content Reference

M

Target Key

4231

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