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JUEX-NM-000520 - The Juniper EX switch must be configured to implement cryptographic mechanisms using a FIPS 140-2/140-3 approved algorithm to protect the confidentiality of remote maintenance sessions.

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Information

This requires the use of secure protocols instead of their unsecured counterparts, such as SSH instead of telnet, SCP instead of FTP, and HTTPS instead of HTTP. If unsecured protocols (lacking cryptographic mechanisms) are used for sessions, the contents of those sessions will be susceptible to eavesdropping, potentially putting sensitive data (including administrator passwords) at risk of compromise and potentially allowing hijacking of maintenance sessions.

Use only 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 implement cryptographic mechanisms to protect the confidentiality of remote maintenance sessions using a FIPS 140-2/FIPS 140-3 approved algorithm.

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 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_Y26M01_STIG.zip

Item Details

References: CAT|I, CCI|CCI-003123, Rule-ID|SV-253929r1167984_rule, STIG-ID|JUEX-NM-000520, Vuln-ID|V-253929

Plugin: Juniper

Control ID: 22641e090b9475dbd120aad7d71d434960ea6410b36290f0654980bd4193153d