Apple iOS must implement the management setting: not allow automatic completion of Safari browser passcodes.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-81811	AIOS-12-010700	SV-96525r1_rule		Low

Description
The AutoFill functionality in the Safari web browser allows the user to complete a form that contains sensitive information, such as PII, without previous knowledge of the information. By allowing the use of the AutoFill functionality, an adversary who learns a user's Apple iOS device passcode, or who otherwise is able to unlock the device, may be able to further breach other systems by relying on the AutoFill feature to provide information unknown to the adversary. By disabling the AutoFill functionality, the risk of an adversary gaining further information about the device's user or compromising other systems is significantly mitigated. SFR ID: FMT_SMF_EXT.1.1 #47

Description

The AutoFill functionality in the Safari web browser allows the user to complete a form that contains sensitive information, such as PII, without previous knowledge of the information. By allowing the use of the AutoFill functionality, an adversary who learns a user's Apple iOS device passcode, or who otherwise is able to unlock the device, may be able to further breach other systems by relying on the AutoFill feature to provide information unknown to the adversary. By disabling the AutoFill functionality, the risk of an adversary gaining further information about the device's user or compromising other systems is significantly mitigated. SFR ID: FMT_SMF_EXT.1.1 #47

STIG	Date
Apple iOS 12 Security Technical Implementation Guide	2018-11-28

Details

Check Text ( C-81603r1_chk )
Review configuration settings to confirm "Enable autofill" is unchecked. 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 "Enable autofill" is unchecked. Alternatively, verify the text "safariAllowAutoFill" 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 iOS management tool containing the management policy. 5. Tap "Restrictions". 6. Verify "Auto-fill in Safari not allowed" is present. If "Enable autofill" is checked in the Apple iOS management tool, or "safariAllowAutoFill" appears in the configuration profile, or the restrictions policy on the Apple iOS device from the Apple iOS management tool does not list "Auto-fill in Safari not allowed", this is a finding.

Check Text ( C-81603r1_chk )

Review configuration settings to confirm "Enable autofill" is unchecked.

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 "Enable autofill" is unchecked.

Alternatively, verify the text "safariAllowAutoFill" 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 iOS management tool containing the management policy.
5. Tap "Restrictions".
6. Verify "Auto-fill in Safari not allowed" is present.

If "Enable autofill" is checked in the Apple iOS management tool, or "safariAllowAutoFill" appears in the configuration profile, or the restrictions policy on the Apple iOS device from the Apple iOS management tool does not list "Auto-fill in Safari not allowed", this is a finding.

Fix Text (F-88661r1_fix)
Install a configuration profile to disable the "AutoFill" capability in the Safari app.