Samsung Android 8 with Knox must implement the management setting: CONTAINER Account whitelist.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-80267	KNOX-08-000300	SV-94971r1_rule		Medium

Description
Whitelisting of authorized email accounts (POP3, IMAP, EAS) prevents a user from configuring a personal email account that could be used to forward sensitive DoD data to unauthorized recipients. SFR ID: FMT_SMF_EXT.1.1 #47

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

Details

Check Text ( C-79939r1_chk )
Review Samsung Android 8 with Knox configuration settings to determine if the mobile device is enforcing CONTAINER Account Whitelisting. 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 "Account whitelist" setting in the "CONTAINER Accounts" rule. 2. Verify the whitelist only contains DoD-approved email domains (for example, mail.mil). Note: Proper configuration of Account blacklist is required for this configuration to function correctly. On the Samsung Android 8 with Knox device, do the following: 1. Open the Knox CONTAINER. 2. Open "Workspace settings". 3. Select "Accounts". 4. Select "Add account". 5. Select "Email" (and repeat for Microsoft Exchange ActiveSync) and attempt to add an email account with a DoD-approved domain. 6. Verify the email account can be added. 7. Attempt to add an email account with a domain not approved by DoD. 8. Verify the email account cannot be added. If the MDM console "Account whitelist" is not set to contain DoD-approved email domains or on the Samsung Android 8 with Knox device, the user is able to successfully configure the email account with a domain not approved by DoD, or if the user is not able to install the DoD-approved email account, this is a finding.

Check Text ( C-79939r1_chk )

Review Samsung Android 8 with Knox configuration settings to determine if the mobile device is enforcing CONTAINER Account Whitelisting.

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 "Account whitelist" setting in the "CONTAINER Accounts" rule.
2. Verify the whitelist only contains DoD-approved email domains (for example, mail.mil).
Note: Proper configuration of Account blacklist is required for this configuration to function correctly.

On the Samsung Android 8 with Knox device, do the following:
1. Open the Knox CONTAINER.
2. Open "Workspace settings".
3. Select "Accounts".
4. Select "Add account".
5. Select "Email" (and repeat for Microsoft Exchange ActiveSync) and attempt to add an email account with a DoD-approved domain.
6. Verify the email account can be added.
7. Attempt to add an email account with a domain not approved by DoD.
8. Verify the email account cannot be added.

If the MDM console "Account whitelist" is not set to contain DoD-approved email domains or on the Samsung Android 8 with Knox device, the user is able to successfully configure the email account with a domain not approved by DoD, or if the user is not able to install the DoD-approved email account, this is a finding.

Fix Text (F-87073r1_fix)
Configure Samsung Android 8 with Knox to enforce CONTAINER Account Whitelisting. On the MDM console, add all DoD-approved email domains to the "Account whitelist" setting in the "CONTAINER Accounts" rule. Note: Recommended to add .*@mail.mil.