Title

Apple iOS must not allow screen capture. (Cat II impact)

Discussion

By allowing the screen capture function, a user has the ability to capture a screen containing sensitive information and then transfer it to an application not authorized to store or process that type of information. For example, the unauthorized app may automatically perform cloud backup to non-DoD servers. If a screen capture containing sensitive information were copied to a location with inadequate protection, there would be a risk that an adversary could obtain it. Disabling the screen capture function will mitigate the risk of leaking sensitive information. SFR ID: FMT_SMF.1.1 #42

Check Content

Review configuration settings to confirm “Allow screenshots” is disabled. 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 screenshots" is unchecked. Alternatively, verify the text "<key>allowScreenShot</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 "Screen capture not allowed" is listed. If "Allow screenshots" is checked in the iOS management tool, "<key>allowScreenShot</key> <true/>" appears in the configuration profile, or the restrictions policy on the iOS device from the iOS management tool does not list "Screen capture not allowed", this is a finding.

Fix Text

Install a Configuration Profile to disable the screen capture function.

Additional Identifiers

Rule ID:

Vulnerability ID: V-54245

Group Title:

Expert Comments

CCIs tied to check.

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