The Ubuntu operating system must require users to reauthenticate for privilege escalation or when changing roles.

STIG ID: UBTU-20-010014  |  SRG: SRG-OS-000373-GPOS-00156 |  Severity: medium (CAT II)  |  CCI: CCI-002038 |  Vulnerability Id: V-238208

Vulnerability Discussion

Without reauthentication, users may access resources or perform tasks for which they do not have authorization.

When operating systems provide the capability to escalate a functional capability, it is critical the user reauthenticate.

Satisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000373-GPOS-00157

Check

Verify 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/*

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

Fix

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