The Juniper EX switch must be configured to implement replay-resistant authentication mechanisms for network access to privileged accounts.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-253903	JUEX-NM-000260	SV-253903r879597_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. Techniques used to address this include protocols using nonces (e.g., numbers generated for a specific one-time use) or challenges (e.g., TLS, WS_Security). Additional techniques include time-synchronous or challenge-response one-time authenticators.

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. Techniques used to address this include protocols using nonces (e.g., numbers generated for a specific one-time use) or challenges (e.g., TLS, WS_Security). Additional techniques include time-synchronous or challenge-response one-time authenticators.

STIG	Date
Juniper EX Series Switches Network Device Management Security Technical Implementation Guide	2023-03-23

Details

Check Text ( C-57355r843740_chk )
Determine if the network device implements replay-resistant authentication mechanisms for network access to privileged accounts. This requirement may be verified by demonstration, configuration review, or validated test results. This requirement may be met through use of a properly configured authentication server if the device is configured to use the authentication server. Verify SSH version 2 is configured for network (remote) access to privileged accounts. [edit system services ssh] protocol-version v2; If the network device does not implement replay-resistant authentication mechanisms for network access to privileged accounts, this is a finding.

Check Text ( C-57355r843740_chk )

Determine if the network device implements replay-resistant authentication mechanisms for network access to privileged accounts. This requirement may be verified by demonstration, configuration review, or validated test results. This requirement may be met through use of a properly configured authentication server if the device is configured to use the authentication server.

Verify SSH version 2 is configured for network (remote) access to privileged accounts.
[edit system services ssh]
protocol-version v2;

If the network device does not implement replay-resistant authentication mechanisms for network access to privileged accounts, this is a finding.

Fix Text (F-57306r843741_fix)
Configure the network device to implement replay-resistant authentication mechanisms for network access to privileged accounts. set system services ssh protocol-version v2