Vulnerability Discussion

Beta operating system updates may contain features that could lead to the compromise of sensitive DOD information or provide a vector for the attack on the DOD network. The current STIG will not normally provide controls to disable these unsecure features.

Check

This is a supervised-only control. If the iPhone or iPad being reviewed is not supervised by the MDM, this control is automatically a finding.

This check procedure is performed on both the device management tool and the iPhone and iPad.

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 iOS management tool, verify "Allow installing configuration profiles (supervised only)" is unchecked.

On the iPhone and iPad device:
1. Open the Settings app.
2. Tap "General".
3. Tap "VPN & Device Management".
4. Tap the Configuration Profile from the iOS management tool containing the restrictions policy.
5. Tap "Restrictions".
6. Verify "Installing configuration profiles not allowed" is listed.

If "Allow installing configuration profiles" is not disabled in the management tool, this is a finding.

Fix

Install a configuration profile to disable the installation of new configuration profiles. This will block the download and installation of beta iOS and iPadOS updates. This is a supervised-only control.