Title

Apple iOS must not allow DoD applications to access non-DoD data. (Cat III impact)

Discussion

Managed apps have been approved for the handling of DoD sensitive information. Unmanaged apps are provided for productivity and morale purposes, but are not approved to handle DoD sensitive information. Examples of unmanaged apps include apps for news services, travel guides, maps, and social networking. If a document containing malware (e.g., macros performing malicious functions) were obtained from an untrusted source and then ported to a managed app, it might eventually reach other DoD computing systems vulnerable to the malware. Preventing managed apps from opening documents from unmanaged apps greatly mitigates this risk.

Check Content

This check procedure is performed on both the iOS Over-the-Air 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 Over-the-Air management tool, verify "Allow documents from unmanaged apps in managed apps" is unchecked. For example, in Apple Configurator: 1. Ask the MDM administrator to open the relevant configuration profile. 2. Display the "Restrictions" payload. 3. Verify "Allow documents from unmanaged apps in managed apps" is unchecked. Alternatively, verify the text "<key>allowOpenFromUnmanagedToManaged</key> <false/>" appears in the configuration profile (.mobileconfig file). On the iOS device: 1. Open the Settings app. 2. Tap "General". 3. Tap "Profiles". 4. Verify the profile from the iOS Over-the-Air management tool is present. If "Allow documents from unmanaged apps in managed apps" is checked in the iOS Over-the-Air management tool, "<key>allowOpenFromUnmanagedToManaged</key> <true/>" appears in the configuration profile, or the configuration profile from the iOS Over-the-Air management tool is not present on the iOS device, this is a finding.

Fix Text

Configure iOS and applications to prevent DoD applications from inappropriately accessing non-DoD data. In the iOS Over-the-Air management tool, uncheck "Allow documents from unmanaged apps in managed apps". For example, in Apple Configurator, edit the configuration and uncheck "Allow documents from unmanaged apps in managed apps".

Additional Identifiers

Rule ID:

Vulnerability ID: V-43232

Group Title:

Expert Comments

CCIs tied to check.

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