STIGQter: STIG Summary: Cisco NX-OS Switch L2S Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 08 May 2020:

The Cisco switch must uniquely identify all network-connected endpoint devices before establishing any connection.

DISA Rule

SV-110325r1_rule

Vulnerability Number

V-101221

Group Title

SRG-NET-000148-L2S-000015

Rule Version

CISC-L2-000020

Severity

CAT I

CCI(s)

• CCI-000778 - The information system uniquely identifies an organization-defined list of specific and/or types of devices before establishing a local, remote, or network connection.

Weight

10

Fix Recommendation

Configure 802.1 x authentications on all host-facing access switch ports. To authenticate those devices that do not support 802.1x, MAC Authentication Bypass must be configured.

Step 1: Configure the radius servers as shown in the example below:

SW1(config)# radius-server host 10.1.1.1 key xxxx
SW1(config)# radius-server host 10.2.1.1 key xxxx

Step 2: Enable 802.1x authentication on the switch.

SW1(config)# aaa group server radius RADIUS_GROUP
SW1(config-radius)# server 10.1.1.1
SW1(config-radius)# server 10.2.1.1
SW1(config-radius)# exit
SW1(config)# aaa authentication dot1x default group RADIUS_GROUP
SW1(config)# exit

Step 3: Enable 802.1x on all host-facing interfaces as shown in the example below:

SW1(config)# int e1/1 - 80
SW1(config-if-range)# dot1x port-control auto
SW1(config-if-range)# dot1x host-mode single-host
SW1(config-if-range)# end

Note: Host-mode must be set to single-host, multi-domain (for VoIP phone + PC), or multi-auth (multiple PCs connected to a hub). Host-mode multi-host is not compliant with this requirement.

Check Contents

Verify if the switch configuration has 802.1x authentication implemented for all access switch ports connecting to LAN outlets (i.e., RJ-45 wall plates) or devices not located in the telecom room, wiring closets, or equipment rooms. MAC Authentication Bypass (MAB) must be configured on those switch ports connected to devices that do not support an 802.1x supplicant.

Step 1: Verify that 802.1x is configured on all host-facing interfaces as shown in the example below:

interface Ethernet1/1
dot1x pae authenticator
dot1x port-control auto
dot1x host-mode single-host
switchport access vlan 10

interface Ethernet1/2
dot1x pae authenticator
dot1x port-control auto
dot1x host-mode single-host
switchport access vlan 10

interface Ethernet1/3
dot1x pae authenticator
dot1x port-control auto
dot1x host-mode single-host
switchport access vlan 10

Note: Host-mode must be set to single-host, multi-domain (for VoIP phone + PC), or multi-auth (multiple PCs connected to a hub). Host-mode multi-host is not compliant with this requirement.

Step 2: Verify that 802.1x authentication is configured on the switch as shown in the example below:

aaa group server radius RADIUS_GROUP
server 1.1.1.1
server 1.2.1.1
…
…
…
aaa authentication dot1x default group RADIUS_GROUP

Step 3: Verify that the radius servers have been defined.

radius-server host 10.1.1.1 key 7 "xxxxxxxxxxx" authentication accounting timeout 5 retransmit 1
radius-server host 10.2.1.1 key 7 " xxxxxxxxxxx" authentication accounting timeout 5 retransmit 1

If 802.1x authentication or MAB is not configured on all access switch ports connecting to LAN outlets or devices not located in the telecom room, wiring closets, or equipment rooms, this is a finding.

Vulnerability Number

V-101221

Documentable

False

Rule Version

CISC-L2-000020

Severity Override Guidance

Verify if the switch configuration has 802.1x authentication implemented for all access switch ports connecting to LAN outlets (i.e., RJ-45 wall plates) or devices not located in the telecom room, wiring closets, or equipment rooms. MAC Authentication Bypass (MAB) must be configured on those switch ports connected to devices that do not support an 802.1x supplicant.

Step 1: Verify that 802.1x is configured on all host-facing interfaces as shown in the example below:

interface Ethernet1/1
dot1x pae authenticator
dot1x port-control auto
dot1x host-mode single-host
switchport access vlan 10

interface Ethernet1/2
dot1x pae authenticator
dot1x port-control auto
dot1x host-mode single-host
switchport access vlan 10

interface Ethernet1/3
dot1x pae authenticator
dot1x port-control auto
dot1x host-mode single-host
switchport access vlan 10

Note: Host-mode must be set to single-host, multi-domain (for VoIP phone + PC), or multi-auth (multiple PCs connected to a hub). Host-mode multi-host is not compliant with this requirement.

Step 2: Verify that 802.1x authentication is configured on the switch as shown in the example below:

aaa group server radius RADIUS_GROUP
server 1.1.1.1
server 1.2.1.1
…
…
…
aaa authentication dot1x default group RADIUS_GROUP

Step 3: Verify that the radius servers have been defined.

radius-server host 10.1.1.1 key 7 "xxxxxxxxxxx" authentication accounting timeout 5 retransmit 1
radius-server host 10.2.1.1 key 7 " xxxxxxxxxxx" authentication accounting timeout 5 retransmit 1

If 802.1x authentication or MAB is not configured on all access switch ports connecting to LAN outlets or devices not located in the telecom room, wiring closets, or equipment rooms, this is a finding.

Check Content Reference

M

Target Key

3551

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