SV-29731r1: Unauthorized registry paths and sub-paths are remotely accessible. | Windows Vista Security Technical Implementation Guide

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Assessment Title

Rule Text

Unauthorized registry paths and sub-paths are remotely accessible.

Description

Discussion Text

The registry is a database for computer configuration information, much of which is sensitive. An attacker could use this to facilitate unauthorized activities. To reduce the risk of this happening, it is also lowered by the fact that the default ACLs assigned throughout the registry are fairly restrictive and they help to protect it from access by unauthorized users.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001090CCE-4781-1

Additional Details

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:120
# Unauthorized registry paths and sub-paths are remotely accessible.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Registry key AllowedPaths is blank
# 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\Control\SecurePipeServers\Winreg\AllowedPaths').GetValueKind('Machine').ToString()]) -eq 'reg_multi_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SecurePipeServers\Winreg\AllowedPaths' -Name 'Machine' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'Machine') -match '.+'))
}
# Registry key AllowedPaths has specific values
# registry_object (registry_test)
function test_2 {
  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\Control\SecurePipeServers\Winreg\AllowedPaths').GetValueKind('Machine').ToString()]) -eq 'reg_multi_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SecurePipeServers\Winreg\AllowedPaths' -Name 'Machine' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'Machine') -match '^((Software\\Microsoft\\OLAP Server)|(Software\\Microsoft\\Windows NT\\CurrentVersion\\Perflib)|(Software\\Microsoft\\Windows NT\\CurrentVersion\\Print)|(Software\\Microsoft\\Windows NT\\CurrentVersion\\Windows)|(System\\CurrentControlSet\\Control\\ContentIndex)|(System\\CurrentControlSet\\Control\\Print\\Printers)|(System\\CurrentControlSet\\Control\\Terminal Server)|(System\\CurrentControlSet\\Control\\Terminal Server\\UserConfig)|(System\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration)|(System\\CurrentControlSet\\Services\\Eventlog)|(System\\CurrentControlSet\\Services\\Sysmon[Ll]og))$'))
}
# Registry key AllowedPaths does not exist
# registry_object (registry_test)
function test_3 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SecurePipeServers\Winreg\AllowedPaths' -Name 'Machine')))
}

if ((test_1 -or test_2 -or test_3)) {
  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:120
$allowedPaths = "Software\Microsoft\OLAP Server","Software\Microsoft\Windows NT\CurrentVersion\Perflib","Software\Microsoft\Windows NT\CurrentVersion\Print","Software\Microsoft\Windows NT\CurrentVersion\Windows","System\CurrentControlSet\Control\ContentIndex","System\CurrentControlSet\Control\Print\Printers","System\CurrentControlSet\Control\Terminal Server","System\CurrentControlSet\Control\Terminal Server\UserConfig","System\CurrentControlSet\Control\Terminal Server\DefaultUserConfiguration","System\CurrentControlSet\Services\Eventlog","System\CurrentControlSet\Services\SysmonLog"
$allowedPathsReg = "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SecurePipeServers\Winreg\AllowedPaths"
if (!(Test-Path $allowedPathsReg)) { Write-Output "PASS"; exit 0 }
$allowedPathsValue = (Get-ItemProperty -Path $allowedPathsReg).PSObject.Properties.Value -join "`n"
if ($allowedPathsValue -match "^$allowedPaths$") { Write-Output "PASS"; exit 0 }
Write-Output "FAIL"; exit 1

Remediation

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Network access: Remotely accessible registry paths and sub-paths” as specified in the Check section.