Title

Apple iOS must not allow automatic completion of Safari browser passcodes. (Cat III impact)

Discussion

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 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 comprising other systems is significantly mitigated. SFR ID: FMT_SMF.1.1 #42

Check Content

Review configuration settings to confirm “Enable autofill” is unchecked. 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 "Enable autofill" is unchecked. Alternatively, verify the text "<key>safariAllowAutoFill</key><false>" appears in the configuration profile (.mobileconfig file). On the iOS device: 1. Open the Settings app. 2. Tap "Safari". 3. Verify "Passwords & AutoFill" is grayed out. If "Enable autofill" is checked in the iOS management tool, or "<key>safariAllowAutoFill</key><true>" appears in the configuration profile, or "Passwords & AutoFill" is not grayed out on the iOS device, this is a finding.

Fix Text

Install a Configuration Profile to disable the AutoFill capability in the Safari app.

Additional Identifiers

Rule ID:

Vulnerability ID: V-54275

Group Title:

Expert Comments

CCIs tied to check.

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