Title

LG Android 6.x must not allow a USB mass storage mode. (Cat II impact)

Discussion

USB mass storage mode enables the transfer of data and software from one device to another. This software can include malware. When USB mass storage is enabled on a mobile device, it becomes a potential vector for malware and unauthorized data exfiltration. Prohibiting USB mass storage mode mitigates this risk. SFR ID: FMT_SMF_EXT.1.1 #39

Check Content

This validation procedure is performed on both the MDM Administration Console and the LG Android device. On the MDM console, do the following: 1. Ask the MDM administrator to display the "Allow USB" setting in the MDM console. 2. Verify the setting is disabled. 3. Verify the policy has been assigned to all groups. On the LG Android device: 1. Unlock the device. 2. Connect device to a USB cable. 3. Open device Notification bar and select the USB notification "Tap for more USB options. 4. Verify all USB connection types, except for "Charge only", are disabled and cannot be enabled (grayed out). Since the USB storage and USB media player cannot be used, the USB function is only available for device charging. If on the MDM console the "Allow USB" setting is enabled or if on the LG Android device any USB functions that are available other than device charging, this is a finding.

Fix Text

Configure the mobile operating system to disable USB mass storage mode. On the MDM Administration Console, disable "Allow USB".

Additional Identifiers

Rule ID: SV-81319r2_rule

Vulnerability ID: V-66829

Group Title:

Expert Comments

CCIs tied to check.

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