STIGQter: STIG Summary: Cisco NX-OS Switch RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Apr 2021:

The Cisco switch must be configured to implement message authentication for all control plane protocols.

DISA Rule

SV-221072r622190_rule

Vulnerability Number

V-221072

Group Title

SRG-NET-000230-RTR-000001

Rule Version

CISC-RT-000020

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.
• CCI-002205 - The information system uniquely identifies and authenticates source by organization, system, application, and/or individual for information transfer.

Weight

10

Fix Recommendation

Configure authentication to be enabled for every protocol that affects the routing or forwarding tables.

The example configuration commands below enable OSPF, EIGRP, IS-IS, and BGP authentication.

BGP Example

SW1(config)# switch bgp nn
SW1(config-router)# neighbor 10.1.12.2
SW1(config-router-neighbor)# password xxxxxxxx
SW1(config-router-neighbor)# end

EIGRP Example

Step 1: Configure the key chain.

SW1(config)# key chain EIGRP_KEY
SW1(config-keychain)# key 1
SW1(config-keychain-key)# key-string xxxxxx
SW1(config-keychain-key)# exit
SW1(config-keychain)# exit

Step 2: Apply the key chain to the EIGRP process or each neighbor.

Authentication for the EIGRP process

SW1(config)# router eigrp 1
SW1(config-router)# authentication mode md5
SW1(config-router)# authentication key-chain XXXXXX
SW1(config-router)# end

or

Authentication for the EIGRP neighbor

SW1(config)# int e2/21
SW1(config-if)# ip authentication mode eigrp 1 md5
SW1(config-if)# ip authentication key-chain eigrp 1 xxxxx
SW1(config-if)# end

Note: Interface authentication overrides process authentication.

IS-IS Example

Step 1: Configure the key chain.

SW1(config)# key chain ISIS_KEY
SW1(config-keychain)# key 1
SW1(config-keychain-key)# key-string xxxxxx
SW1(config-keychain-key)# exit
SW1(config-keychain)# exit

Step 2: Apply the key chain to each ISIS neighbor.

SW1(config)# int e2/20
SW1(config-if)# isis authentication-type md5 level-1
SW1(config-if)# isis authentication key-chain xxxxx level-1

OSPF Example

Step 1: Configure the key chain.

SW1(config)# key chain OSPF_KEY
SW1(config-keychain)# key 1
SW1(config-keychain-key)# key-string xxxxxx
SW1(config-keychain-key)# exit
SW1(config-keychain)# exit

Step 2: Apply the key chain to each OSPF neighbor.

SW1(config)# int e2/2
SW1(config-if)# ip ospf authentication
SW1(config-if)# ip ospf authentication key-chain OSPF_KEY

RIP Example

Step 1: Configure the key chain.

SW1(config)# key chain RIP_KEY
SW1(config-keychain)# key 1
SW1(config-keychain-key)# key-string xxxxxx
SW1(config-keychain-key)# exit
SW1(config-keychain)# exit

Step 2: Apply the key chain to each RIP neighbor.

SW1(config)# int e2/8
SW1(config-if)# ip rip authentication mode md5
SW1(config-if)# ip rip authentication key-chain RIP_KEY

Check Contents

Review the switch configuration. Verify that neighbor switch authentication is enabled for all routing protocols. The configuration examples below depicts BGP, EIGRP, IS-IS and OSPF authentication.

BGP Example

router bgp 1
router-id 1.1.1.1
address-family ipv4 unicast
neighbor 10.1.12.2 remote-as 2
password 3 3ec66c90c104ad13

EIGRP Example

key chain EIGRP_KEY
key 1
key-string xxxxxxx
…
…
…
interface Ethernet2/21
no switchport
ip router eigrp 1
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 EIGRP_KEY

or

router eigrp 1
authentication mode md5
authentication key-chain EIGRP_KEY

Note: Interface authentication overrides process authentication.

IS-IS Example

interface Ethernet2/20
no switchport
isis authentication-type md5 level-1
isis authentication key-chain xxxxx level-1
ip router isis 1

OSPF Example

interface Ethernet2/2
no switchport
ip ospf authentication
ip ospf authentication key-chain OSPF_KEY
ip router ospf 1 area 0.0.0.0

RIP Example

interface Ethernet2/8
no switchport
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY

If authentication is not enabled on all routing protocols, this is a finding.

Vulnerability Number

V-221072

Documentable

False

Rule Version

CISC-RT-000020

Severity Override Guidance

Review the switch configuration. Verify that neighbor switch authentication is enabled for all routing protocols. The configuration examples below depicts BGP, EIGRP, IS-IS and OSPF authentication.

BGP Example

router bgp 1
router-id 1.1.1.1
address-family ipv4 unicast
neighbor 10.1.12.2 remote-as 2
password 3 3ec66c90c104ad13

EIGRP Example

key chain EIGRP_KEY
key 1
key-string xxxxxxx
…
…
…
interface Ethernet2/21
no switchport
ip router eigrp 1
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 EIGRP_KEY

or

router eigrp 1
authentication mode md5
authentication key-chain EIGRP_KEY

Note: Interface authentication overrides process authentication.

IS-IS Example

interface Ethernet2/20
no switchport
isis authentication-type md5 level-1
isis authentication key-chain xxxxx level-1
ip router isis 1

OSPF Example

interface Ethernet2/2
no switchport
ip ospf authentication
ip ospf authentication key-chain OSPF_KEY
ip router ospf 1 area 0.0.0.0

RIP Example

interface Ethernet2/8
no switchport
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY

If authentication is not enabled on all routing protocols, this is a finding.

Check Content Reference

M

Target Key

4075

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