The Ubuntu operating system must require users to re-authenticate for privilege escalation and changing roles.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75489	UBTU-16-010300	SV-90169r2_rule		Medium

Description
Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When Ubuntu operating systems provide the capability to escalate a functional capability or change security roles, it is critical the user re-authenticate. Satisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000373-GPOS-00157

STIG	Date
Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide	2018-07-18

Details

Check Text ( C-75193r2_chk )
Verify that "/etc/sudoers" has no occurrences of "NOPASSWD" or "!authenticate". Check that the "/etc/sudoers" file has no occurrences of "NOPASSWD" or "!authenticate" by running the following command: # sudo egrep -i '(nopasswd\|!authenticate)' /etc/sudoers /etc/sudoers.d/* %wheel ALL=(ALL) NOPASSWD: ALL If any occurrences of "NOPASSWD" or "!authenticate" return from the command, this is a finding.

Check Text ( C-75193r2_chk )

Verify that "/etc/sudoers" has no occurrences of "NOPASSWD" or "!authenticate".

Check that the "/etc/sudoers" file has no occurrences of "NOPASSWD" or "!authenticate" by running the following command:

# sudo egrep -i '(nopasswd|!authenticate)' /etc/sudoers /etc/sudoers.d/*

%wheel ALL=(ALL) NOPASSWD: ALL

If any occurrences of "NOPASSWD" or "!authenticate" return from the command, this is a finding.

Fix Text (F-82117r2_fix)
Remove any occurrence of "NOPASSWD" or "!authenticate" found in "/etc/sudoers" file or files in the "/etc/sudoers.d" directory.