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, SRG-OS-000373-GPOS-00158
Check
Verify that "/etc/sudoers" has no occurrences of "NOPASSWD".
Check that the "/etc/sudoers" file has no occurrences of "NOPASSWD" by running the following command:
$ sudo grep -ir nopasswd /etc/sudoers /etc/sudoers.d
%admin ALL=(ALL) NOPASSWD: ALL
If any occurrences of "NOPASSWD" are returned from the command and have not been documented with the ISSO as an organizationally defined administrative group using MFA, this is a finding.
Fix
Configure the operating system to require users to supply a password for privilege escalation.
Check the configuration of the "/etc/sudoers" file with the following command:
$ sudo visudo
Remove any occurrences of "NOPASSWD" tags in the file.
Check the configuration of the /etc/sudoers.d/* files with the following command:
$ sudo grep -ir nopasswd /etc/sudoers.d
Remove any occurrences of "NOPASSWD" tags in the file.