SV-29006r2: Automatic logons must be disabled. | Windows Vista Security Technical Implementation Guide

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Assessment Title

Rule Text

Automatic logons must be disabled.

Description

Discussion Text

Allowing a system to automatically log on when the machine is booted could give access to any unauthorized individual who restarts the computer. Automatic logon with administrator privileges would give full access to an unauthorized individual.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366CCE-3072-6

Additional Details

Severity Override Guidance

If the DefaultName or DefaultDomainName in the same registry path contain an administrator account name and the DefaultPassword contains a value, this is a CAT I finding.

Responsibility

System Administrator

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:432
# Automatic logons must be disabled.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# registry_object (registry_test)
function test_1 {
  return (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name 'AutoAdminLogon' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'AutoAdminLogon') -eq 0)
}
# registry_object (registry_test)
function test_2 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name 'AutoAdminLogon')))
}
# registry_object (registry_test)
function test_3 {
  return ((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon').GetValueKind('AutoAdminLogon').ToString()]) -eq 'reg_sz')
}
# registry_object (registry_test)
function test_4 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name 'AutoAdminLogon')))
}
# registry_object (registry_test)
function test_5 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name 'DefaultPassword')))
}

if (((test_1 -or test_2) -and (test_3 -or test_4) -and test_5)) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

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:432
$compliant = ((Get-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name 'AutoAdminLogon' -ErrorAction SilentlyContinue).AutoAdminLogon -eq 0) -and (-not (Test-Path -Path 'HKLM:\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\DefaultPassword'))
if ($compliant) { Write-Output "PASS"; Exit 0 } else { Write-Output "FAIL"; Exit 1 }

Remediation

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "MSS: (AutoAdminLogon) Enable Automatic Logon (not recommended)" to "Disabled".

Ensure no passwords are stored in the "DefaultPassword" registry value noted below.

Registry Hive: HKEY_LOCAL_MACHINE
Subkey: \Software\Microsoft\Windows NT\CurrentVersion\Winlogon\

Value Name: DefaultPassword