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

From Canonical Ubuntu 16.04 Security Technical Implementation Guide

Associated with: CCI-002038

SV-90169r2_rule The Ubuntu operating system must require users to re-authenticate for privilege escalation and changing roles.

Vulnerability discussion

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

Check content

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

Remove any occurrence of "NOPASSWD" or "!authenticate" found in "/etc/sudoers" file or files in the "/etc/sudoers.d" directory.

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