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The Juniper EX switch must be configured to permit authorized users to remotely view, in real time, all content related to an established user session from a component separate from the layer 2 switch.


Overview

Finding ID Version Rule ID IA Controls Severity
V-253953 JUEX-L2-000060 SV-253953r843892_rule Medium
Description
Without the capability to remotely view/hear all content related to a user session, investigations into suspicious user activity would be hampered. Real-time monitoring allows authorized personnel to take action before additional damage is done. The ability to observe user sessions as they are happening allows for interceding in ongoing events that after-the-fact review of captured content would not allow.
STIG Date
Juniper EX Series Switches Layer 2 Switch Security Technical Implementation Guide 2022-08-31

Details

Check Text ( C-57405r843890_chk )
Verify if the switch configuration has an analyzer to capture ingress and egress packets from any designated switch port for the purpose of remotely monitoring a specific user session.

Packet capture using the [edit forwarding-options analyzer ] configuration will only be present and enabled when actively monitoring sessions.

The Juniper switch supports either output interface or output vlan. To output to a VLAN that is trunked to a remote location, configure the switch with the destination VLAN, configure the uplink interface as trunked, and include the remote analyzer VLAN in the uplink trunk.

If actively capturing packets, verify an analyzer is present.
[edit vlans]
{
vlan-id ;
}

[edit interfaces]
{
unit 0 {
family ethernet-switching {
interface-mode trunk;
vlan {
members ;
}
}
}
}

[edit forwarding-options]
analyzer {
{
input {
ingress {
interface .;
-or-
interface irb.;
}
egress {
interface .;
-or-
interface irb.;
}
output {
vlan {
;
}
}
}
}
Note: Simultaneously mirroring both ingress and egress traffic may exceed the output interface capacity. Packet mirroring consumes resources and should only be enabled when actively monitoring sessions.

If active monitoring is not currently required, the lack of an analyzer, or the presence of an inactive (disabled) analyzer, is not a finding.

If the switch is not configured to capture ingress and egress packets from a designated access interface for the purpose of remotely monitoring a specific user session, this is a finding.
Fix Text (F-57356r843891_fix)
Enable the feature or configure the switch so that it is capable of capturing ingress and egress packets from any designated switch port for the purpose of monitoring a specific user session.

set vlans vlan-id

set interfaces unit 0 family ethernet-switching interface-mode trunk
set interfaces unit 0 family ethernet-switching vlan members

set forwarding-options analyzer input ingress interface .
-or-
set forwarding-options analyzer input ingress interface irb.

set forwarding-options analyzer input egress interface .
-or-
set forwarding-options analyzer input egress interface irb.

set forwarding-options analyzer output vlan