From Samsung Android OS 6 (with KNOX 2.x) Security Technical Implementation Guide
Part of PP-MDF-201029
Associated with: CCI-000366 CCI-002824
Spilt-tunneling allows multiple simultaneous remote connections to the mobile device. Without VPN split-tunneling disabled, malicious applications can covertly off-load device data to a third-party server or set up a trusted tunnel between a non-DoD third-party server and a DoD network, providing a vector to attack the network.
Note: This validation procedure is identical to the one for KNOX-39-015600. It only needs to be performed once. If it is found compliant on the first check, it is also compliant here. If it is determined to be a finding on the first check, it is also a finding here. Redundant checks are necessary to maintain requirements traceability and provide complete risk management information to Authorizing Officials (AOs). 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 "CC Mode" settings in the "Android Restrictions" rule. 2. Verify the value is enabled. Note: If the MDM does not support CC mode, ask the MDM administrator if the Samsung APK has been installed and CC mode enabled. On the Samsung KNOX for Android device: 1. Open the device settings. 2. Select "About Device". 3. Select "Software info" (Note: On some devices, this step is not needed.) 4. Verify the value of "Security software version" displays "Enforced". If the CC mode setting is not enabled, or if the "Security software version" on the device does not display "Enforced", this is a finding.
Configure the mobile operating system to disable VPN split-tunneling (if the mobile device provides a configurable control). Configure the operating system to enable CC mode. On the MDM Administration Console, enable the "CC mode" setting in the "Android Restrictions" rule. If this setting is not available on the console, install the CC mode APK and enable CC mode from this application. This APK will be made available by Samsung.
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