The Ubuntu operating system must use strong authenticators in establishing nonlocal maintenance and diagnostic sessions.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-219309	UBTU-18-010414	SV-219309r508662_rule		Medium

Description
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. Local maintenance and diagnostic activities are those activities carried out by individuals physically present at the information system or information system component and not communicating across a network connection. Typically, strong authentication requires authenticators that are resistant to replay attacks and employ multifactor authentication. Strong authenticators include, for example, PKI where certificates are stored on a token protected by a password, passphrase, or biometric.

Description

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. Local maintenance and diagnostic activities are those activities carried out by individuals physically present at the information system or information system component and not communicating across a network connection. Typically, strong authentication requires authenticators that are resistant to replay attacks and employ multifactor authentication. Strong authenticators include, for example, PKI where certificates are stored on a token protected by a password, passphrase, or biometric.

STIG	Date
Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide	2020-09-10

Details

Check Text ( C-21034r305255_chk )
Verify the Ubuntu operating system is configured to use strong authenticators in the establishment of nonlocal maintenance and diagnostic maintenance. Check that "UsePAM" is set to yes in /etc/ssh/sshd_config: # grep UsePAM /etc/ssh/sshd_config UsePAM yes If "UsePAM" is not set to "yes", this is a finding.

Fix Text (F-21033r305256_fix)
Configure the Ubuntu operating system to use strong authentication when establishing nonlocal maintenance and diagnostic sessions. Add or modify the following line to /etc/ssh/sshd_config UsePAM yes