The Juniper SRX Services Gateway must implement replay-resistant authentication mechanisms for network access to privileged accounts.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223216	JUSX-DM-000124	SV-223216r960993_rule		Medium

Description
A replay attack may enable an unauthorized user to gain access to the application. Authentication sessions between the authenticator and the application validating the user credentials must not be vulnerable to a replay attack. An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message. There are 2 approved methods for accessing the Juniper SRX which are, in order of preference, the SSH protocol and the console port.

Description

A replay attack may enable an unauthorized user to gain access to the application. Authentication sessions between the authenticator and the application validating the user credentials must not be vulnerable to a replay attack. An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message. There are 2 approved methods for accessing the Juniper SRX which are, in order of preference, the SSH protocol and the console port.

STIG	Date
Juniper SRX SG NDM Security Technical Implementation Guide	2024-06-10

Details

Check Text ( C-24889r513335_chk )
Verify SSH is configured to use a replay-resistant authentication mechanism. [edit] show system services ssh If SSH is not configured to use the MAC authentication protocol, this is a finding.

Fix Text (F-24877r513336_fix)
Configure SSH to use a replay-resistant authentication mechanism. The following is an example stanza. [edit] set system services ssh macs hmac-sha2-512 set system services ssh macs hmac-sha2-256 set system services ssh macs hmac-sha1 set system services ssh macs hmac-sha1-96