Apple iOS must not include applications with the following characteristics: Siri when the device is locked.

From Apple iOS 11 Security Technical Implementation Guide

Part of PP-MDF-301100

Associated with: CCI-000366 CCI-001806

SV-93075r1_rule Apple iOS must not include applications with the following characteristics: Siri when the device is locked.

Vulnerability discussion

On Apple iOS devices, users can access the device's contact database or calendar to obtain phone numbers and other information using a human voice even when the mobile device is locked. Often this information is Personally Identifiable Information (PII), which is considered sensitive. It could also be used by an adversary to profile the user or engage in social engineering to obtain further information from other unsuspecting users. Disabling access to the contact database and calendar in these situations mitigates the risk of this attack. The AO may waive this requirement with written notice if the operational environment requires this capability.SFR ID: FMT_SMF_EXT.1.1 #8b

Check content

Review configuration settings to confirm that Siri is disabled on the Lock screen. 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 "Allow Siri while device is locked" is unchecked. Alternatively, verify the text "allowAssistantWhileLocked" 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 "Siri while locked not allowed" is listed. If "Allow Siri while device is locked" is checked in the Apple iOS management tool, "allowAssistantWhileLocked" appears in the configuration profile, or the restrictions policy on the Apple iOS device from the Apple iOS management tool does not list "Siri while locked not allowed", this is a finding.

Fix text

Install a configuration profile to disable Siri while the device is locked.

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