SV-29703r1: Unauthorized shares can be accessed anonymously. | Windows Vista Security Technical Implementation Guide

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Assessment Title

Rule Text

Unauthorized shares can be accessed anonymously.

Description

Discussion Text

This is a Category 1 finding because the potential for gaining unauthorized system access. Any shares listed can be accessed by any network user. This could lead to the exposure or corruption of sensitive data. Enabling this setting is very dangerous.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001090CCE-3349-8

Additional Details

Third-Party Tools

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:116
# Unauthorized shares can be accessed anonymously.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# NullSessionShares registry value does not exist
# registry_object (registry_test)
function test_1 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters' -Name 'NullSessionShares')))
}
# NullSessionShares registry is blank
# 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('NullSessionShares').ToString()]) -eq 'reg_multi_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters' -Name 'NullSessionShares' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'NullSessionShares') -match '.+'))
}

if (-not ((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:116
$nullSessionSharesPath = "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters\NullSessionShares"
if (-not (Test-Path $nullSessionSharesPath)) {exit 0} else {if ((Get-ItemProperty -Path $nullSessionSharesPath).NullSessionShares -notmatch ".+") {exit 0}}
exit 1

Remediation

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Network access: Shares that can be accessed anonymously” to be defined but containing no entries (Blank).