Title

NixOS must monitor remote access methods. (Cat II impact)

Discussion

Remote access services, such as those providing remote access to network devices and information systems, which lack automated monitoring capabilities, increase risk and make remote user access management difficult at best. Remote access is access to DOD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Automated monitoring of remote access sessions allows organizations to detect cyberattacks and also ensure ongoing compliance with remote access policies by auditing connection activities of remote access capabilities, such as Remote Desktop Protocol (RDP), on a variety of information system components (e.g., servers, workstations, notebook computers, smartphones, and tablets).

Check Content

Confirm the NixOS monitors remote access methods with the following command: $ grep "LogLevel" /etc/ssh/sshd_config LogLevel VERBOSE If "LogLevel" does not equal "VERBOSE", is missing, or is commented out, this is a finding.

Fix Text

Configure NixOS to monitor remote access methods by adding the following configuration to the /etc/nixos/configuration.nix or /etc/nixos/flake.nix: services.openssh.logLevel = "VERBOSE"; Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch

Additional Identifiers

Rule ID: SV-268088r1130975_rule

Vulnerability ID: V-268088

Group Title: SRG-OS-000032-GPOS-00013

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.