SV-15089r1: Unauthorized named pipes are accessible with anonymous credentials. | Windows Vista Security Technical Implementation Guide

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Assessment Title

Rule Text

Unauthorized named pipes are accessible with anonymous credentials.

Description

Discussion Text

This is a Category 1 finding because the potential for gaining unauthorized system access. Pipes are internal system communications processes. They are identified internally by ID numbers that vary between systems. To make access to these processes easier, these pipes are given names that do not vary between systems. This setting controls which of these pipes anonymous users may access.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001090CCE-3380-3

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:114
# Unauthorized named pipes are accessible with anonymous credentials.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Network access: Named Pipes that can be accessed anonymously' is configured to contain no values
# 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\LanManServer\Parameters').GetValueKind('NullSessionPipes').ToString()]) -eq 'reg_multi_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManServer\Parameters' -Name 'NullSessionPipes' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'NullSessionPipes') -eq ''))
}
# Verifies 'Network access: Named Pipes that can be accessed anonymously' contains no values other than NETLOGON, SAMR, Browser or LSARPC
# 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\Services\LanManServer\Parameters').GetValueKind('NullSessionPipes').ToString()]) -eq 'reg_multi_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManServer\Parameters' -Name 'NullSessionPipes' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'NullSessionPipes') -match '^(([Nn][Ee][Tt][Ll][Oo][Gg][Oo][Nn])|([Ll][Ss][Aa][Rr][Pp][Cc])|([Ss][Aa][Mm][Rr])|([Bb][Rr][Oo][Ww][Ss][Ee][Rr]))$'))
}

if ((test_1 -or test_2)) {
  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:114
$regPath = "HKLM:\System\CurrentControlSet\Services\LanManServer\Parameters"
$regKey = "NullSessionPipes"
$regValue = (Get-ItemProperty -Path $regPath -ErrorAction SilentlyContinue).$regKey
if ($regValue -eq $null -or $regValue -eq "" -or ($regValue -match "^(NETLOGON|SAMR|Browser|LSARPC)$")) { 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 -> “Network access: Named pipes that can be accessed anonymously” as defined in the Check section.