STIGQter: STIG Summary: Arista MLS DCS-7000 Series RTR Security Technical Implementation Guide Version: 1 Release: 3 Benchmark Date: 24 Jul 2020:

The Arista Multilayer Switch must encrypt all methods of configured authentication for the OSPF routing protocol.

DISA Rule

SV-75377r2_rule

Vulnerability Number

V-60919

Group Title

SRG-NET-000168-RTR-000077

Rule Version

AMLS-L3-000250

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 routing protocol authentication to encrypt the authentication key via the following commands under the interface configuration mode. SHA1 must be used instead of MD5 in all cases when that option is available.

ip ospf authentication message-digest
ip ospf message-digest-key [number] md5 [type] [key]

For IPv6 global configuration, enter:
ipv6 router ospf [process number]
area [area number] authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

Alternatively, under the interface configuration mode, enter:
ipv6 ospf authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

To use ESP encryption on AH headers, instead enter:
ipv6 router ospf [process number]
area [area number] encryption ipsec spi [spi number] esp null [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

or on an interface:
ipv6 ospf encryption ipsec spi [spi number] esp null [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

Check Contents

Review the router configuration for the following configuration statement under the interface configuration for any interface participating in the OSPF topology. SHA1 must be used instead of MD5 in all cases when that option is available.

ip ospf authentication message-digest
ip ospf message-digest-key [number] md5 [type] [key]

For IPv6 Authentication, one of the following statements must be present under the ipv6 router OSPF configuration statement, or on any interface running OSPFv3, depending on the type of encryption established. There are two methods of authentication for OSPFv3 in this scenario; the first uses authentication header (AH), and the second uses Authentication Header with Encapsulating Security Payload. OSPFv3 authentication can be configured for an interface or an area, and interface configuration will override area configuration. Users may configure a key or a passphrase.

interface ethernet1
ipv6 ospf authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

OR

interface ethernet1
ipv6 ospf encryption ipsec spi [spi number] esp null [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

In an area configuration, the following text must be included under the "ipv6 router ospf [process ID]" configuration section.

ipv6 router ospf 200
area [area number] authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

OR for ESP

ipv6 router ospf 200
area 0 encryption ipsec spi [spi] esp null [md5/sha1] [0/7] [key] |
passphrase [0/7] [key]

If either of these statements is not present, OSPF is not using encryption for authentication, and this is a finding.

Vulnerability Number

V-60919

Documentable

False

Rule Version

AMLS-L3-000250

Severity Override Guidance

Review the router configuration for the following configuration statement under the interface configuration for any interface participating in the OSPF topology. SHA1 must be used instead of MD5 in all cases when that option is available.

ip ospf authentication message-digest
ip ospf message-digest-key [number] md5 [type] [key]

For IPv6 Authentication, one of the following statements must be present under the ipv6 router OSPF configuration statement, or on any interface running OSPFv3, depending on the type of encryption established. There are two methods of authentication for OSPFv3 in this scenario; the first uses authentication header (AH), and the second uses Authentication Header with Encapsulating Security Payload. OSPFv3 authentication can be configured for an interface or an area, and interface configuration will override area configuration. Users may configure a key or a passphrase.

interface ethernet1
ipv6 ospf authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

OR

interface ethernet1
ipv6 ospf encryption ipsec spi [spi number] esp null [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

In an area configuration, the following text must be included under the "ipv6 router ospf [process ID]" configuration section.

ipv6 router ospf 200
area [area number] authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

OR for ESP

ipv6 router ospf 200
area 0 encryption ipsec spi [spi] esp null [md5/sha1] [0/7] [key] |
passphrase [0/7] [key]

If either of these statements is not present, OSPF is not using encryption for authentication, and this is a finding.

Check Content Reference

M

Target Key

2823

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