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NixOS must prevent all software from executing at higher privilege levels than users executing the software.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-268148ANIX-00-001280SV-268148r1131097_ruleCCI-002233medium
Description
In certain situations, software applications/programs need to execute with elevated privileges to perform required functions. However, if the privileges required for execution are at a higher level than the privileges assigned to organizational users invoking such applications/programs, those users are indirectly provided with greater privileges than assigned by the organizations. Some programs and processes are required to operate at a higher privilege level and therefore should be excluded from the organization-defined software list after review.
STIGDate
Anduril NixOS Security Technical Implementation Guide2025-08-19

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

IAC-21.7Privilege Levels for Code Execution
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (17) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-3Access Enforcement
1.00
AC-3(4)Discretionary Access Control
1.00
AC-6(10)Prohibit Non-privileged Users from Executing Privileged Functions
1.00
AC-6(8)Privilege Levels for Code Execution
1.00
AC-6(9)Log Use of Privileged Functions
1.00
AU-3(1)Additional Audit Information
1.00
CM-5(6)Limit Library Privileges
1.00
CM-7Least Functionality
1.00
CM-7(2)Prevent Program Execution
1.00
CM-7(5)Authorized Software — Allow-by-exception
1.00

+7 more (top 10 by confidence shown)

CCI1 mapping
CCI-002233
1.00

Details

Check Text (C-268148r1131097_chk)

Verify NixOS audits and provides alerts of audit failures by running the following command: $grep A -15 security.auditd /etc/nixos/configuration.nix /etc/nixos/configuration.nix: security.auditd.enable = true; security.audit.enable = true; security.audit.rules = [ '' <audit_rules> '' ]; security.audit.rules = [ "-a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k execpriv" "-a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k execpriv" "-a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k execpriv" "-a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k execpriv" ]; If "security.auditd", "security.audit" and the additional modifications do not equal true, are missing, or are commented out, this is a finding.

Fix Text (F-71975r1131096_fix)

Configure the audit service to produce audit records. Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix: security.auditd.enable = true; security.audit.enable = true; Add the following audit rules: security.audit.rules = [ "-a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k execpriv" "-a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k execpriv" "-a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k execpriv" "-a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k execpriv" ]; Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch