Title

Apple iOS must not allow use of Siri when the device is locked. (Cat II impact)

Discussion

On 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.1.1 #42

Check Content

Review configuration settings to confirm that Siri is disabled on lock screen. This check procedure is performed on both the iOS management tool and the iOS 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 Siri while device is locked" is unchecked. Alternatively, verify the text "<key>allowAssistantWhileLocked</key><false/>" appears in the configuration profile (.mobileconfig file). On the iOS device: 1. Open the Settings app. 2. Tap "General". 3. Tap "Profiles" or "Profiles & Device Management" or "Device Management". 4. Tap the Configuration Profile from the 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 iOS management tool, "<key>allowAssistantWhileLocked</key><true/>" appears in the configuration profile, or the restrictions policy on the iOS device from the 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.

Additional Identifiers

Rule ID:

Vulnerability ID: V-54265

Group Title:

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.