SV-29512r3: Local users must not exist on a system in a domain. | Windows Vista Security Technical Implementation Guide

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Assessment Title

Rule Text

Local users must not exist on a system in a domain.

Description

Discussion Text

To minimize potential points of attack, local users, other than built-in accounts such as Administrator and Guest accounts, must not exist on a workstation in a domain. Users must log onto workstations in a domain with their domain accounts.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000366

Additional Details

Responsibility

Information Assurance Officer

References

DPMS Target Windows Vista DISA DPMS Target Windows Vista 1029

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.fso.windows:def:433
# Local users must not exist on a system in a domain.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.
#
# MANUAL REVIEW REQUIRED -- the module(s) below could not be reconstructed
# into working code from curated SCC reference data, and are excluded from
# the automated result:
#   - user_object (user_test) -- System has no local users (besides local admin, guest, help, and support): cannot derive an existence probe for this object type

# System is not a member of a domain
# registry_object (registry_test)
function test_1 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters').GetValueKind('Domain').ToString()]) -eq 'reg_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters' -Name 'Domain' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'Domain') -match '^$'))
}

if (test_1) {
  Write-Output "PASS (automated portion only -- MANUAL REVIEW still required, see notes above)"
} else {
  Write-Output "FAIL (or see MANUAL REVIEW note above)"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual windows_vista target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:433
$domainCheck = (Test-Path -Path "HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Domain")
if (-not $domainCheck -or (Get-CimInstance -ClassName Win32_ComputerSystem).DomainName -eq "") {
    $localUsers = Get-LocalUser -ErrorAction SilentlyContinue
    if ($localUsers -and $localUsers.Count -gt 3) {
        Write-Output "FAIL"; exit 1
    }
}
Write-Output "PASS"; exit 0

function Get-LocalUser {
    param([switch]$ErrorAction)
    try {
        Get-LocalUser -ErrorAction Stop
    } catch {
        if ($ErrorAction -or $_.Exception.Message -notlike "No matching user found*") {
            throw
        }
    }
}

Remediation

Limit local user accounts on domain-joined systems.  Remove any unauthorized local accounts.