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NixOS must be configured to limit the number of concurrent sessions to 10 for all accounts and/or account types.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-268085ANIX-00-000090SV-268085r1130966_ruleCCI-000054low
Description
Operating system management includes the ability to control the number of users and user sessions that use an operating system. Limiting the number of allowed users and sessions per user is helpful in reducing the risks related to denial-of-service (DoS) attacks. This requirement addresses concurrent sessions for information system accounts and does not address concurrent sessions by single users via multiple system accounts. The maximum number of concurrent sessions should be defined based upon mission needs and the operational environment for each system.
STIGDate
Anduril NixOS Security Technical Implementation Guide2025-08-19

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (11) 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.

HRS-02Position Categorization
1.00
HRS-11Separation of Duties (SoD)
1.00
IAC-01Identity & Access Management (IAM)
1.00
IAC-01.2Authenticate, Authorize and Audit (AAA)
1.00
IAC-02Identification & Authentication for Organizational Users
1.00
IAC-03Identification & Authentication for Non-Organizational Users
1.00
IAC-04Identification & Authentication for Devices
1.00
IAC-05Identification & Authentication for Third-Party Technology Assets, Applications and/or Services (TAAS)
1.00
IAC-08Role-Based Access Control (RBAC)
1.00
IAC-21Least Privilege
1.00

+1 more (top 10 by confidence shown)

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (28) 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-10Concurrent Session Control
1.00
AC-12Session Termination
1.00
AC-17(10)Authenticate Remote Commands
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-3Access Enforcement
1.00
AC-3(4)Discretionary Access Control
1.00
AC-7Unsuccessful Logon Attempts
1.00
AU-9Protection of Audit Information
1.00

+18 more (top 10 by confidence shown)

CCI1 mapping
CCI-000054
1.00
NIST CSF 2.00 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.

PR.AA-05
1.00

Who does this work

8 NICE work roles and 6 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-268085r1130966_chk)

Verify NixOS limits the number of concurrent sessions to 10 for all accounts and/or account types. Check the pam configuration files and confirm a conf file with maxlogins configured: $ grep "limits.conf" /etc/pam.d/login > session required /nix/store/sl3fa5zh61xxl03m64if2wqzbvrb6zly-linux-pam-1.6.1/lib/security/pam_limits.so conf=/nix/store/aq8ni1qh3pdygl9cn3qfb8v583ask67m-limits.conf # limits (order 12200) $ cat /nix/store/aq8ni1qh3pdygl9cn3qfb8v583ask67m-limits.conf * hard maxlogins 10 @pipewire - rtprio 95 @pipewire - nice -19 @pipewire - memlock 4194304 If the "maxlogins" item is missing or commented out, or the value is set greater than "10" and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

Fix Text (F-71912r1130965_fix)

Configure NixOS to limit the number of concurrent sessions to 10 for all accounts and/or account types. Update the NixOS config, typically stored either in /etc/nixos/configuration.nix or /etc/nixos/flake.nix: security.pam.loginLimits = [ { domain = "*"; item = "maxlogins"; type = "hard"; value = "10"; } ]; Note: Security.pam.loginLimits can be set as a global domain (with the * wildcard) but may be set differently for multiple domains. Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch