V-14677
The network device must use its loopback or OOB management interface address as the source address when originating TFTP or FTP traffic.
Discussion
Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of network devices. It is easier to construct appropriate ingress filters for management plane traffic destined to the network management subnet since the source addresses will be from the range used for loopback interfaces instead of a larger range of addresses used for physical interfaces. Log information recorded by authentication and syslog servers will record the router's loopback address instead of the numerous physical interface addresses. TFTP and FTP messages sent to management servers should use the loopback address as the source address.
Fix Text
Configure the network device to use a loopback or OOB management interface address as the source address when originating TFTP or FTP traffic.
Check Content
Review the device configuration to verify the loopback interface address is used as the source address when originating TFTP or FTP traffic. If the device is managed from an OOB management network, the OOB interface must be used instead. If the loopback or OOB management interface isn't being used as the source address for TFTP or FTP traffic, this is a finding.
Responsibility
Information Assurance Officer
IA Controls
ECSC-1