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

The Cisco router must be configured to use encryption for routing protocol authentication.

DISA Rule

SV-216644r531086_rule

Vulnerability Number

V-216644

Group Title

SRG-NET-000168-RTR-000077

Rule Version

CISC-RT-000040

Severity

CAT II

CCI(s)

• CCI-000803 - The information system implements mechanisms for authentication to a cryptographic module that meet the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.

Weight

10

Fix Recommendation

Configure all routing protocol authentications to encrypt the authentication key.

BGP Example:

R1(config)#router bgp nn
R1(config-router)#neighbor x.x.x.x password xxxxxx

EIGRP Example:

R2(config)#int g0/1
R2(config-if)#ip authentication mode eigrp 1 md5
R2(config-if)#ip authentication key-chain eigrp 1 EIGRP_KEY_CHAIN

IS-IS Example:

R5(config)#int g0/1
R5(config-if)#isis authentication mode md5
R5(config-if)#isis authentication key-chain ISIS_KEY_CHAIN

OSPF Example:

R1(config)#int g1/0
R1(config-if)#ip ospf authentication message-digest
R1(config-if)#ip ospf message-digest-key 1 md5 xxxxxx

RIP Example:

R2(config)#int g1/0
R2(config-if)#ip rip authentication mode md5
R2(config-if)#ip rip authentication key-chain RIP_KEY_CHAIN

Check Contents

Review the router configuration. For every routing protocol that affects the routing or forwarding tables, verify that neighbor router authentication is encrypting the authentication key as shown in the examples below.

BGP Example:

router bgp nn
no synchronization
bgp log-neighbor-changes
neighbor x.x.x.x remote-as nn
neighbor x.x.x.x password xxxxxxx

Note: BGP authentication uses MD5

EIGRP Example:

interface GigabitEthernet1/0
ip address x.x.x.x 255.255.255.0
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 EIGRP_KEY_CHAIN

IS-IS Example:

interface GigabitEthernet1/0
ip address x.x.x.x 255.255.255.0
ip router isis
isis authentication mode md5
isis authentication key-chain ISIS_KEY_CHAIN

OSPF Example:

interface GigabitEthernet1/0
ip address x.x.x.x 255.255.255.0
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 xxxxxx

RIP Example:

interface GigabitEthernet1/0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY_CHAIN

If the routing protocol is not encrypting the authentication key, this is a finding.

Vulnerability Number

V-216644

Documentable

False

Rule Version

CISC-RT-000040

Severity Override Guidance

Review the router configuration. For every routing protocol that affects the routing or forwarding tables, verify that neighbor router authentication is encrypting the authentication key as shown in the examples below.

BGP Example:

router bgp nn
no synchronization
bgp log-neighbor-changes
neighbor x.x.x.x remote-as nn
neighbor x.x.x.x password xxxxxxx

Note: BGP authentication uses MD5

EIGRP Example:

interface GigabitEthernet1/0
ip address x.x.x.x 255.255.255.0
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 EIGRP_KEY_CHAIN

IS-IS Example:

interface GigabitEthernet1/0
ip address x.x.x.x 255.255.255.0
ip router isis
isis authentication mode md5
isis authentication key-chain ISIS_KEY_CHAIN

OSPF Example:

interface GigabitEthernet1/0
ip address x.x.x.x 255.255.255.0
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 xxxxxx

RIP Example:

interface GigabitEthernet1/0
ip rip authentication mode md5
ip rip authentication key-chain RIP_KEY_CHAIN

If the routing protocol is not encrypting the authentication key, this is a finding.

Check Content Reference

M

Target Key

4028

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