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V-223216

CAT II (Medium)

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

Rule ID

SV-223216r960993_rule

STIG

Juniper SRX Services Gateway NDM Security Technical Implementation Guide

Version

V3R3

CCIs

CCI-001941

Discussion

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.

Check Content

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

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