Title

NixOS must require users to reauthenticate for privilege escalation. (Cat II impact)

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.

Check Content

Verify NixOS enforces reauthentication with sudo with the following command: $ sudo grep timestamp_timeout /etc/sudoers Defaults timestamp_timeout=0 If "timestamp_timeout" is greater than 0, is commented out, or is missing, this is a finding.

Fix Text

Configure /etc/nixos/configuration.nix to enforce reauthentication with sudo by adding the following configuration settings: security.sudo.extraConfig = '' Defaults timestamp_timeout=0 ''; Rebuild the system with the following command: $ sudo nixos-rebuild switch

Additional Identifiers

Rule ID: SV-268155r1039536_rule

Vulnerability ID: V-268155

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

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