Samsung Android 8 with Knox must be configured to disable USB mass storage mode.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-80231	KNOX-08-015000	SV-94935r1_rule		Medium

Description
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 #39a

STIG	Date
Samsung Android OS 8 with Knox 3.x COBO Use Case Security Technical Implementation Guide	2018-11-30

Details

Check Text ( C-79903r1_chk )
Review Samsung Android 8 with Knox configuration settings to determine if the mobile device has a USB mass storage mode and whether it has been disabled. This validation procedure is performed on both the MDM Administration Console and the Samsung Android 8 with Knox device. On the MDM console, do the following: 1. Ask the MDM Administrator to display the "Disable USB Media Player" check box in the "Android Restrictions" rule. 2. Verify the "Disable USB Media Player" check box is selected. Note: Disabling USB Media Player will also disable USB MTP, USB mass storage, and USB vendor protocol (Smart Switch, KIES). On the Samsung Android 8 with Knox device, connect the device to a PC USB connection. Note: Do not use a DoD network-managed PC for this test! On the PC: Verify the device is not shown in the PC finder. If the MDM console "Disable USB Media Player" is not set to disable USB mass storage mode or with the Samsung Android 8 with Knox device, it is shown as a USB mass storage device on the PC, this is a finding.

Check Text ( C-79903r1_chk )

Review Samsung Android 8 with Knox configuration settings to determine if the mobile device has a USB mass storage mode and whether it has been disabled.

This validation procedure is performed on both the MDM Administration Console and the Samsung Android 8 with Knox device.

On the MDM console, do the following:
1. Ask the MDM Administrator to display the "Disable USB Media Player" check box in the "Android Restrictions" rule.
2. Verify the "Disable USB Media Player" check box is selected.

Note: Disabling USB Media Player will also disable USB MTP, USB mass storage, and USB vendor protocol (Smart Switch, KIES).

On the Samsung Android 8 with Knox device, connect the device to a PC USB connection.

Note: Do not use a DoD network-managed PC for this test!

On the PC:
Verify the device is not shown in the PC finder.

If the MDM console "Disable USB Media Player" is not set to disable USB mass storage mode or with the Samsung Android 8 with Knox device, it is shown as a USB mass storage device on the PC, this is a finding.

Fix Text (F-87037r1_fix)
Configure Samsung Android 8 with Knox to disable USB mass storage mode. On the MDM console, select the "Disable USB Media Player" check box in the "Android Restrictions" rule.