The network element must only allow management connections for administrative access from hosts residing in to the management network.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-5611	NET1637	SV-15450r3_rule		Medium

Description
Remote administration is inherently dangerous because anyone with a sniffer and access to the right LAN segment, could acquire the device account and password information. With this intercepted information they could gain access to the infrastructure and cause denial of service attacks, intercept sensitive information, or perform other destructive actions.

STIG	Date
Perimeter Router Security Technical Implementation Guide Juniper	2018-02-27

Details

Check Text ( C-12915r3_chk )
Review the router configuration and verify that only authorized internal connections are allowed access to the routing engine via ssh. Access to the Juniper routing engine is via loopback interface. The configuration should look similar to the following: [edit interfaces] lo0 { unit 0 { family inet { filter { input protect-routing-engine; } address 192.168.1.2/32; } } } [edit firewall] family inet { filter protect-routing-engine { term terminal-access { from { source-address { 192.168.1.10; 192.168.1.11; } protocol tcp; port ssh; } then { syslog; accept; } } term default-action { then { log; discard; } } } }

Check Text ( C-12915r3_chk )

Review the router configuration and verify that only authorized internal connections are allowed access to the routing engine via ssh. Access to the Juniper routing engine is via loopback interface. The configuration should look similar to the following:

[edit interfaces]
lo0 {
unit 0 {
family inet {
filter {
input protect-routing-engine;
}
address 192.168.1.2/32;
}
}
}

[edit firewall]
family inet {
filter protect-routing-engine {
term terminal-access {
from {
source-address {
192.168.1.10;
192.168.1.11;
}
protocol tcp;
port ssh;
}
then {
syslog;
accept;
}
}
term default-action {
then {
log;
discard;
}
}
}
}

Fix Text (F-5522r4_fix)
Configure an ACL or filter to restrict management access to the device from only the management network.