The Juniper EX switch must be configured to authenticate all network-connected endpoint devices before establishing any connection.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-253954	JUEX-L2-000070	SV-253954r843895_rule		Medium

Description
Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. For distributed architectures (e.g., service-oriented architectures), the decisions regarding the validation of authentication claims may be made by services separate from the services acting on those decisions. In such situations, it is necessary to provide authentication decisions (as opposed to the actual authenticators) to the services that need to act on those decisions. This requirement applies to applications that connect either locally, remotely, or through a network to an endpoint device (including, but not limited to, workstations, printers, servers (outside a datacenter), VoIP Phones, and VTC CODECs). Gateways and SOA applications are examples of where this requirement would apply. Device authentication is a solution enabling an organization to manage devices. It is an additional layer of authentication ensuring only specific pre-authorized devices can access the system.

Description

Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. For distributed architectures (e.g., service-oriented architectures), the decisions regarding the validation of authentication claims may be made by services separate from the services acting on those decisions. In such situations, it is necessary to provide authentication decisions (as opposed to the actual authenticators) to the services that need to act on those decisions. This requirement applies to applications that connect either locally, remotely, or through a network to an endpoint device (including, but not limited to, workstations, printers, servers (outside a datacenter), VoIP Phones, and VTC CODECs). Gateways and SOA applications are examples of where this requirement would apply. Device authentication is a solution enabling an organization to manage devices. It is an additional layer of authentication ensuring only specific pre-authorized devices can access the system.

STIG	Date
Juniper EX Series Switches Layer 2 Switch Security Technical Implementation Guide	2022-08-31

Details

Check Text ( C-57406r843893_chk )
Verify the switch configuration has 802.1x authentication implemented for all access interfaces connecting to LAN outlets (i.e., RJ-45 wall plates) or devices not located in the telecom room, wiring closets, or equipment rooms. Static MAC Bypass or MAC RADIUS must be configured on access interfaces connected to devices that do not support an 802.1x supplicant. Junos supports three supplicant types: single-secure (authenticate and permit only a single device), multiple (separately authenticate and permit multiple devices), and single (authenticate the first supplicant and permit all others). Verify that the RADIUS server(s) are configured. RADIUS servers can be configured globally at [edit access radius-server] or defined for each group. [edit access] radius-server { secret "PSK"; ## SECRET-DATA } profile dot1x_radius { authentication-order radius; radius { authentication-server ; <<< Must be defined if using global RADIUS server. Optional if RADIUS is defined specifically for the profile. } radius-server { secret "PSK"; ## SECRET-DATA <<< Must be defined if not using global RADIUS server. Takes precedence if both profile and global RADIUS is configured. } } Verify 802.1x or MAC RADIUS is configured on all host-facing access interfaces when RADIUS is available as shown in the following example: [edit protocols dot1x] authenticator { authentication-profile-name dot1x_radius; interface { ge-0/0/0.0 { <<< Connected device with 802.1x supplicant supplicant single-secure; } ge-0/0/1.0 { <<< Connected device with 802.1x supplicant and interface support for MAC RADIUS supplicant multiple; mac-radius; } ge-0/0/2.0 { <<< Connected device without 802.1x supplicant mac-radius { restrict; } } } } Note: Junos simultaneously supports both 802.1x and MAC RADIUS on the same access interface. To prevent 802.1x and have the interface use only MAC RADIUS, configure the "restrict" qualifier. If RADIUS is unavailable or not configured: [edit protocols] dot1x { authenticator { static { /48 { vlan-assignment ; interface .; } } } } If 802.1x authentication, Static MAC Bypass, or MAC RADIUS is not configured on all access interfaces connecting to LAN outlets or devices not located in the telecom room, wiring closets, or equipment rooms, this is a finding.

Check Text ( C-57406r843893_chk )

Verify the switch configuration has 802.1x authentication implemented for all access interfaces connecting to LAN outlets (i.e., RJ-45 wall plates) or devices not located in the telecom room, wiring closets, or equipment rooms. Static MAC Bypass or MAC RADIUS must be configured on access interfaces connected to devices that do not support an 802.1x supplicant. Junos supports three supplicant types: single-secure (authenticate and permit only a single device), multiple (separately authenticate and permit multiple devices), and single (authenticate the first supplicant and permit all others).

Verify that the RADIUS server(s) are configured. RADIUS servers can be configured globally at [edit access radius-server] or defined for each group.
[edit access]
radius-server {
secret "PSK"; ## SECRET-DATA
}
profile dot1x_radius {
authentication-order radius;
radius {
authentication-server ; <<< Must be defined if using global RADIUS server. Optional if RADIUS is defined specifically for the profile.
}
radius-server {
secret "PSK"; ## SECRET-DATA <<< Must be defined if not using global RADIUS server. Takes precedence if both profile and global RADIUS is configured.
}
}

Verify 802.1x or MAC RADIUS is configured on all host-facing access interfaces when RADIUS is available as shown in the following example:
[edit protocols dot1x]
authenticator {
authentication-profile-name dot1x_radius;
interface {
ge-0/0/0.0 { <<< Connected device with 802.1x supplicant
supplicant single-secure;
}
ge-0/0/1.0 { <<< Connected device with 802.1x supplicant and interface support for MAC RADIUS
supplicant multiple;
mac-radius;
}
ge-0/0/2.0 { <<< Connected device without 802.1x supplicant
mac-radius {
restrict;
}
}
}
}
Note: Junos simultaneously supports both 802.1x and MAC RADIUS on the same access interface. To prevent 802.1x and have the interface use only MAC RADIUS, configure the "restrict" qualifier.

If RADIUS is unavailable or not configured:
[edit protocols]
dot1x {
authenticator {
static {
/48 {
vlan-assignment ;
interface .;
}
}
}
}

If 802.1x authentication, Static MAC Bypass, or MAC RADIUS is not configured on all access interfaces connecting to LAN outlets or devices not located in the telecom room, wiring closets, or equipment rooms, this is a finding.

Fix Text (F-57357r843894_fix)
Configure 802.1 x authentication on all host-facing access interfaces. To authenticate those devices that do not support an 802.1x supplicant, Static MAC Bypass or MAC RADIUS must be configured. Configure RADIUS if available: set access radius-server secret "" set access profile dot1x_radius radius authentication-server -or- set access profile dot1x_radius radius-server secret "" set access profile dot1x_radius authentication-order radius To configure 802.1x on an access interface: set protocols dot1x authenticator authentication-profile-name dot1x_radius set protocols dot1x authenticator interface ge-0/0/0.0 supplicant single-secure set protocols dot1x authenticator interface ge-0/0/1.0 supplicant multiple set protocols dot1x authenticator interface ge-0/0/1.0 mac-radius set protocols dot1x authenticator interface ge-0/0/2.0 mac-radius restrict To configure Static MAC Bypass: set protocols dot1x authenticator static /48 vlan-assignment set protocols dot1x authenticator static /48 interface .

Fix Text (F-57357r843894_fix)

Configure 802.1 x authentication on all host-facing access interfaces. To authenticate those devices that do not support an 802.1x supplicant, Static MAC Bypass or MAC RADIUS must be configured.

Configure RADIUS if available:
set access radius-server secret ""
set access profile dot1x_radius radius authentication-server
-or-
set access profile dot1x_radius radius-server secret ""

set access profile dot1x_radius authentication-order radius

To configure 802.1x on an access interface:
set protocols dot1x authenticator authentication-profile-name dot1x_radius
set protocols dot1x authenticator interface ge-0/0/0.0 supplicant single-secure
set protocols dot1x authenticator interface ge-0/0/1.0 supplicant multiple
set protocols dot1x authenticator interface ge-0/0/1.0 mac-radius
set protocols dot1x authenticator interface ge-0/0/2.0 mac-radius restrict

To configure Static MAC Bypass:
set protocols dot1x authenticator static /48 vlan-assignment
set protocols dot1x authenticator static /48 interface .