STIGQter: STIG Summary: Cisco IOS XE Router RTR Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 23 Apr 2021:

The Cisco router providing connectivity to the Network Operations Center (NOC) must be configured to forward all in-band management traffic via an IPsec tunnel.

DISA Rule

SV-216684r531086_rule

Vulnerability Number

V-216684

Group Title

SRG-NET-000205-RTR-000013

Rule Version

CISC-RT-000460

Severity

CAT II

CCI(s)

• CCI-001097 - The information system monitors and controls communications at the external boundary of the information system and at key internal boundaries within the system.

Weight

10

Fix Recommendation

This requirement is not applicable for the DODIN Backbone.

Ensure that all traffic from the managed network to the management network is secured via IPsec tunnel as shown in the configuration examples below.

Step 1: Configure the ACL for the management network as the destination. This ACL will be defined in the crypto as the interesting traffic to be forwarded into the IPsec tunnel.

R4(config)#ip access-list extended MGMT_TRAFFIC_ACL
R4(config-ext-nacl)#permit ip 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255
R4(config-ext-nacl)#exit

Step 2: Create an ISAKMP policy for Phase 1 negotiations.

R4(config)#crypto isakmp policy 10
R4(config-isakmp)#hash sha256
R4(config-isakmp)#authentication pre-share
R4(config-isakmp)#exit

Step 3: Specify the pre-shared key and the remote peer address.

R4(config)#crypto isakmp key 0 xxxxxx address 10.1.12.1

Note: Digital certificates can be utilized as an alternative.

Step 4: Create the Phase 2 policy for the data encryption.

R4(config)#crypto ipsec transform-set TRANS_SET ah-sha256-hmac esp-aes
R4(cfg-crypto-trans)#mode tunnel
R4(cfg-crypto-trans)#exit

Step 5: Create the crypto map.

R4(config)#crypto map IPSEC_MGMT_MAP 10 ipsec-isakmp
R4(config-crypto-map)#set peer 10.1.12.1
R4(config-crypto-map)#match address MGMT_TRAFFIC_ACL
R4(config-crypto-map)#set transform-set TRANS_SET
R4(config-crypto-map)#end

Step 6: Apply the crypto map to the external interface.

R4(config)#int g0/2
R4(config-if)#crypto map IPSEC_MGMT_MAP

Check Contents

This requirement is not applicable for the DODIN Backbone.

Verify that all traffic from the managed network to the management network or NOC and vice-versa is secured via IPsec tunnel.

Step 1: Note the crypto map applied to the external interface.

interface GigabitEthernet0/2
description link to DISN
ip address x.1.24.4 255.255.255.0
crypto map IPSEC_MGMT_MAP

Step 2: Review the ISAKMP policy for Phase 1 negotiations and Phase 2 policy for data encryption.

crypto isakmp policy 10
authentication pre-share
hash sha256
crypto isakmp key xxxxxx address x.1.12.1
!
!
crypto ipsec transform-set TRANS_SET ah-sha256-hmac esp-aes

Step 3: Review the crypto map that was bound to the external interface and note the ACL defined that identifies the interesting traffic for the IPsec tunnel.

crypto map IPSEC_MGMT_MAP 10 ipsec-isakmp
set peer x.1.12.1
set transform-set TRANS_SET
match address MGMT_TRAFFIC_ACL

Step 4: Review the ACL defined in the crypto map and verify that the destination is the management network.

ip access-list extended MGMT_TRAFFIC_ACL
permit ip 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255

Note: The management network is this example is 10.22.2.0/24

If the management traffic is not secured via IPsec tunnel, this is a finding.

Vulnerability Number

V-216684

Documentable

False

Rule Version

CISC-RT-000460

Severity Override Guidance

This requirement is not applicable for the DODIN Backbone.

Verify that all traffic from the managed network to the management network or NOC and vice-versa is secured via IPsec tunnel.

Step 1: Note the crypto map applied to the external interface.

interface GigabitEthernet0/2
description link to DISN
ip address x.1.24.4 255.255.255.0
crypto map IPSEC_MGMT_MAP

Step 2: Review the ISAKMP policy for Phase 1 negotiations and Phase 2 policy for data encryption.

crypto isakmp policy 10
authentication pre-share
hash sha256
crypto isakmp key xxxxxx address x.1.12.1
!
!
crypto ipsec transform-set TRANS_SET ah-sha256-hmac esp-aes

Step 3: Review the crypto map that was bound to the external interface and note the ACL defined that identifies the interesting traffic for the IPsec tunnel.

crypto map IPSEC_MGMT_MAP 10 ipsec-isakmp
set peer x.1.12.1
set transform-set TRANS_SET
match address MGMT_TRAFFIC_ACL

Step 4: Review the ACL defined in the crypto map and verify that the destination is the management network.

ip access-list extended MGMT_TRAFFIC_ACL
permit ip 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255

Note: The management network is this example is 10.22.2.0/24

If the management traffic is not secured via IPsec tunnel, this is a finding.

Check Content Reference

M

Target Key

4028

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