Samsung Knox Android must protect data-at-rest on removable storage media.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-49681	KNOX-20-004410	SV-62615r1_rule		Medium

Description
The operating system must ensure the data being written to the mobile device's storage media is protected from unauthorized access. If data at rest is unencrypted, it is vulnerable to disclosure. Even if the operating system enforces permissions on data access, an adversary can read storage devices directly, thereby circumventing operating system controls. Encrypting the data ensures that confidentiality is protected even when the operating system is not running. SFR ID: FDP_DAR_EXT.1.1

Description

The operating system must ensure the data being written to the mobile device's storage media is protected from unauthorized access. If data at rest is unencrypted, it is vulnerable to disclosure. Even if the operating system enforces permissions on data access, an adversary can read storage devices directly, thereby circumventing operating system controls. Encrypting the data ensures that confidentiality is protected even when the operating system is not running. SFR ID: FDP_DAR_EXT.1.1

STIG	Date
Samsung Android (with Knox 1.x) STIG	2014-04-22

Details

Check Text ( C-51565r1_chk )
This validation procedure is performed on both the MDM Administration Console and the Samsung Knox Android device. Check whether the appropriate setting is configured on the MDM Administration Console: 1. Ask the MDM administrator to display the "Storage Encryption" and "External Storage Encryption" checkbox in the "Android Restrictions" rule. () 2. Verify the "Storage Encryption" and "External Storage Encryption" checkbox are checked. On the Samsung Knox Android device: 1. Open the device settings. 2. Select "Security". 3. Verify "Encrypt device" is grayed out and "Encrypted" is displayed. 4. Select "Encrypt external SD card". 5. Verify "The encryption policy has been applied" is displayed at the bottom of the screen. NOTE: If no SD card is inserted, Step 5 should display "SD card is not inserted" at the bottom of the screen. If the specified encryption settings are not set to the appropriate values, this is a finding. () On some MDM vendor consoles, "Storage Encryption" enables both internal and external storage encryption.

Check Text ( C-51565r1_chk )

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

Check whether the appropriate setting is configured on the MDM Administration Console:
1. Ask the MDM administrator to display the "Storage Encryption" and "External Storage Encryption" checkbox in the "Android Restrictions" rule. (**)
2. Verify the "Storage Encryption" and "External Storage Encryption" checkbox are checked.

On the Samsung Knox Android device:
1. Open the device settings.
2. Select "Security".
3. Verify "Encrypt device" is grayed out and "Encrypted" is displayed.
4. Select "Encrypt external SD card".
5. Verify "The encryption policy has been applied" is displayed at the bottom of the screen.

NOTE: If no SD card is inserted, Step 5 should display "SD card is not inserted" at the bottom of the screen.

If the specified encryption settings are not set to the appropriate values, this is a finding.
(**) On some MDM vendor consoles, "Storage Encryption" enables both internal and external storage encryption.

Fix Text (F-53195r2_fix)
Configure the mobile device to enable data-at-rest protection for removable media. Configure the OS to encrypt all data at rest on the mobile device. On the MDM Administration Console, check the "Storage Encryption" and "External Storage Encryption" checkbox in the "Android Restrictions" rule.