From Samsung Android OS 6 (with KNOX 2.x) Security Technical Implementation Guide
Part of PP-MDF-201011
Associated with: CCI-001199
The mobile operating system must ensure the data being written to the mobile device's built-in 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 media directly, thereby circumventing operating system controls. Encrypting the data ensures confidentiality is protected even when the operating system is not running.
This validation procedure is performed on both the MDM Administration Console and the Samsung KNOX for Android device. Check whether the appropriate setting is configured on the MDM Administration Console: 1. Ask the MDM administrator to display the "Storage Encryption" check box in the "Android Restrictions" rule. (**) 2. Verify the "Storage Encryption" check box is selected. On the Samsung KNOX for Android device: 1. Open the device settings. 2. Select "Lock screen and security". 3. Select "Secure startup". (Note: On some devices, shown as "Protect encrypted data".) 4. Verify "Do not require" is grayed out and "Require password when device turns on" is selected. (Note: On some devices, shown as "Require screen lock to decrypt data when device turns on".) 5. Insert a MicroSD card into the device. 6. If the MicroSD card is not already encrypted, select "Encrypt SD card". Verify "The security policy restricts use of SD cards that are not encrypted" is displayed. 7. If the MicroSD card is encrypted, verify "Decrypt SD card" is displayed and cannot be selected. 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. Note: Starting with the Galaxy S7, new devices that ship with Android 6.0 will have device encryption enabled by default that cannot be disabled.
Configure the mobile operating system to enable data-at-rest protection for built-in storage media. Configure the OS to encrypt all data at rest on the mobile device. On the MDM Administration Console, check the "Storage Encryption" check box in the "Android Restrictions" rule.
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