For nonlocal maintenance sessions using SSH, the Juniper SRX Services Gateway must securely configured SSHv2 with privacy options to protect the confidentiality of maintenance and diagnostic communications for nonlocal maintenance sessions.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223227	JUSX-DM-000150	SV-223227r513370_rule		Medium

Description

To protect the confidentiality of nonlocal maintenance sessions when using SSH communications, SSHv2, AES ciphers, and key-exchange commands are configured. 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. The SSHv2 protocol suite includes Layer 7 protocols such as SCP and SFTP which can be used for secure file transfers. The key-exchange commands limit the key exchanges to FIPS and DoD-approved methods.

STIG	Date
Juniper SRX SG NDM Security Technical Implementation Guide	2021-03-25

Details

Check Text ( C-24900r513368_chk )
Verify SSHv2, AES ciphers, and key-exchange commands are configured to protect confidentiality. [edit] show system services ssh If SSHv2, AES ciphers, and key-exchange commands are not configured to protect confidentiality, this is a finding.

Fix Text (F-24888r513369_fix)

Configure SSH confidentiality options to comply with DoD requirements. [edit] set system services ssh protocol-version v2 set system services ssh ciphers aes256-ctr set system services ssh ciphers aes256-cbc set system services ssh ciphers aes192-ctr set system services ssh ciphers aes192-cbc set system services ssh ciphers aes128-ctr set system services ssh ciphers aes128-cbc set system services ssh key-exchange dh-group14-sha1 set system services ssh key-exchange group-exchange-sha2 set system services ssh key-exchange ecdh-sha2-nistp256 set system services ssh key-exchange ecdh-sha2-nistp384 set system services ssh key-exchange ecdh-sha2-nistp521