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JUEX-NM-000510 - The Juniper EX switches must be configured to use FIPS-validated Keyed-Hash Message Authentication Code (HMAC) to protect the integrity of nonlocal maintenance and diagnostic communications.

Information

Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied upon to provide confidentiality or integrity, and DOD data may be compromised.

Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the internet) or an internal network.

Currently, HMAC is the only FIPS-approved algorithm for generating and verifying message/data authentication codes in accordance with FIPS 198-1. Products that are FIPS 140-2 validated will have an HMAC that meets specification; however, the option must be configured for use as the only message authentication code used for authentication to cryptographic modules.

Separate requirements for configuring applications and protocols used by each application (e.g., SNMPv3, SSHv2, HTTPS, and other protocols and applications that require server/client authentication) are required to implement this requirement. Where SSH is used, the SSHv2 protocol suite is required because it includes Layer 7 protocols such as SCP and SFTP, which can be used for secure file transfers.

Use only AES Counter (CTR) cipher block chaining modes in compliance with CVE-2008-5161, plugin 70658 based on vendor guidance in KB20853. This prevents certain plaintext attacks in OpenSSH.

Solution

Configure the network device to use FIPS-validated HMAC to protect the integrity of nonlocal maintenance and diagnostic communications.

set snmp v3 usm local-engine user <SNMPv3 user> authentication-sha authentication-password 'PSK'
set snmp v3 usm local-engine user <SNMPv3 user> privacy-aes128 privacy-password 'PSK'
Note: Use the strongest HMAC mutually supported with the NMS (e.g., authentication-sha256, authentication-sha512)

set system services ssh protocol-version v2
set system services ssh ciphers aes256-ctr
set system services ssh ciphers aes192-ctr
set system services ssh ciphers aes128-ctr
set system services ssh macs hmac-sha2-512
set system services ssh macs hmac-sha2-256
set system services ssh key-exchange ecdh-sha2-nistp521
set system services ssh key-exchange ecdh-sha2-nistp384
set system services ssh key-exchange ecdh-sha2-nistp256

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Juniper_EX_Switches_Y24M07_STIG.zip

Item Details

Category: MAINTENANCE

References: 800-53|MA-4(6), CAT|I, CCI|CCI-002890, Rule-ID|SV-253928r961554_rule, STIG-ID|JUEX-NM-000510, Vuln-ID|V-253928

Plugin: Juniper

Control ID: e0b603bec62d17937d3aa7ef11c773c6f91cc35b01eb19184d0ed48f0ff7b0ab