SV-225499r569185: Network shares that can be accessed anonymously must not be allowed. | Microsoft Windows Server 2012/2012 R2 Member Server STIG SCAP Benchmark

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Assessment Title

Rule Text

Network shares that can be accessed anonymously must not be allowed.

Description

Discussion Text

Anonymous access to network shares provides the potential for gaining unauthorized system access by network users. This could lead to the exposure or corruption of sensitive data.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001090CCE-25592-7V-3340SV-52884

References

DPMS Target Microsoft Windows Server 2012-2012 R2 MS DISA DPMS Target Microsoft Windows Server 2012-2012 R2 MS 4214

Checks

DISA STIG (Manual Reference)

If the following registry value does not exist, this is not a finding:

If the following registry value does exist and is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE 
Registry Path: \System\CurrentControlSet\Services\LanManServer\Parameters\

Value Name: NullSessionShares

Value Type: REG_MULTI_SZ
Value: (Blank)

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:4585
# Network shares that can be accessed anonymously must not be allowed.
# 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: Shares that can be accessed anonymously' 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\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 '.+'))
}
# Verifies 'Network access: Shares that can be accessed anonymously' is not configured
# registry_object (registry_test)
function test_2 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManServer\Parameters' -Name 'NullSessionShares')))
}

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 ms_windows_2012_and_2012_r2_ms target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:4585
$regPath = "HKLM:\System\CurrentControlSet\Services\LanManServer\Parameters\NullSessionShares"
if (-not (Test-Path $regPath)) { exit 0 }
$regValue = Get-ItemProperty -Path $regPath -Name "Network access: Shares that can be accessed anonymously" -ErrorAction SilentlyContinue
if ($regValue -eq $null -or $regValue.'Network access: Shares that can be accessed anonymously' -eq $null -or $regValue.'Network access: Shares that can be accessed anonymously' -eq "") { exit 0 } else { Write-Output "FAIL"; exit 1 }

Remediation

Ensure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Network access: Shares that can be accessed anonymously" contains no entries (blank).