The Cisco out-of-band management (OOBM) gateway router must be configured to forward only authorized management traffic to the Network Operations Center (NOC).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-216769	CISC-RT-000410	SV-216769r531087_rule		Medium

Description
The OOBM network is an IP network used exclusively for the transport of OAM&P data from the network being managed to the OSS components located at the NOC. Its design provides connectivity to each managed network device, enabling network management traffic to flow between the managed network elements and the NOC. This allows the use of paths separate from those used by the managed network.

STIG	Date
Cisco IOS XR Router RTR Security Technical Implementation Guide	2020-09-23

Details

Check Text ( C-18001r288690_chk )

This requirement is not applicable for the DODIN Backbone. Review the network topology diagram to determine connectivity between the managed network and the NOC. Review the OOBM gateway router configuration to validate the path that the management traffic traverses. Verify that only management traffic is forwarded through the OOBM interface or IPsec tunnel. If an OOBM link is used, verify that the only authorized management traffic is transported to the NOC by reviewing the outbound ACL applied to the OOBM interface as shown in the example below. Step 1: Note the outbound ACL applied to the OOBM interface. interface GigabitEthernet0/0/0/2 description OOB link to NOC ipv4 address 10.11.1.8 255.255.255.0 ipv4 access-group MGMT_TRAFFIC_ACL egress Step 2: Review the outbound ACL and verify only management traffic is forwarded to the NOC. ipv4 access-list MGMT_TRAFFIC_ACL 10 permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq tacacs 20 permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq ssh 30 permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp 40 permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmptrap 50 permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq syslog 60 permit icmp 10.1.34.0 0.0.0.255 10.22.22.0 0.0.0.255 echo 70 permit icmp 10.1.34.0 0.0.0.255 10.22.22.0 0.0.0.255 echo-reply 80 deny ipv4 any any log-input If an IPSec tunnel is used, verify that the only authorized management traffic is transported to the NOC. Step 1: Note the profile referenced for the IPSec tunnel to the NOC. interface tunnel-ipsec 30 profile IPSEC_NOC_PROFILE tunnel source GigabitEthernet0/0/0/2 tunnel destination x.1.22.2 Step 2: Note the crypto ACL that was specified in the IPSec profile. crypto isakmp keyring ISAKMP_KEYRING pre-shared-key address x.1.22.2 255.255.255.255 key encrypted 150A13141C32 ! crypto isakmp policy 10 hash sha256 encryption aes 256 authentication pre-share ! crypto ipsec transform-set IPSEC_TRANS esp-aes 256 esp-sha256-hmac mode tunnel ! crypto ipsec profile IPSEC_NOC_PROFILE set pfs group16 match address MGMT_TRAFFIC_ACL Step 3: Review the crypto ACL defined in the IPSec profile and verify only management traffic is forwarded to the NOC. ipv4 access-list MGMT_TRAFFIC_ACL 10 permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq tacacs 20 permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq ssh 30 permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp 40 permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmptrap 50 permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq syslog 60 permit icmp 10.1.34.0 0.0.0.255 10.22.22.0 0.0.0.255 Note: ICMP is permitted for troubleshooting purposes. The IPSec SA can only identify interesting traffic via address, protocol, and port; hence, the ICMP traffic cannot be qualified via type attribute. If traffic other than authorized management traffic is permitted through the OOBM interface or IPsec tunnel, this is a finding.

Fix Text (F-17999r288691_fix)

This requirement is not applicable for the DODIN Backbone. Configure ACLs to permit only authorized management traffic into IPsec tunnels or the OOBM interface used for forwarding management data as shown in the examples below. OOBM Link RP/0/0/CPU0:R3(config)#ipv4 access-list MGMT_TRAFFIC_ACL RP/0/0/CPU0:R3(config-ipv4-acl)#permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq tacacs RP/0/0/CPU0:R3(config-ipv4-acl)#permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq ssh RP/0/0/CPU0:R3(config-ipv4-acl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp RP/0/0/CPU0:R3(config-ipv4-acl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmptrap RP/0/0/CPU0:R3(config-ipv4-acl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq syslog RP/0/0/CPU0:R3(config-ipv4-acl)#permit icmp 10.1.34.0 0.0.0.255 10.22.22.0 0.0.0.255 RP/0/0/CPU0:R3(config-ipv4-acl)#deny ipv4 any any log-input RP/0/0/CPU0:R3(config-ipv4-acl)#exit IPsec Tunnel RP/0/0/CPU0:R3(config)#ipv4 access-list MGMT_TRAFFIC_ACL RP/0/0/CPU0:R3(config-ipv4-acl)#permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq tacacs RP/0/0/CPU0:R3(config-ipv4-acl)#permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq ssh RP/0/0/CPU0:R3(config-ipv4-acl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp RP/0/0/CPU0:R3(config-ipv4-acl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmptrap RP/0/0/CPU0:R3(config-ipv4-acl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq syslog RP/0/0/CPU0:R3(config-ipv4-acl)#permit icmp 10.1.34.0 0.0.0.255 10.22.22.0 0.0.0.255 RP/0/0/CPU0:R3(config-ipv4-acl)#exit