SV-25101r1: Unauthorized shares can be accessed anonymously. | Windows 7 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 of 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.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001090CCE-9196-7

Additional Details

Third-Party Tools

Responsibility

System Administrator

References

DPMS Target Windows 7 DISA DPMS Target Windows 7 1712

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:3711
# 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.

# 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 windows_7 target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:3711
$nullSessionShares = Get-ItemProperty -Path 'HKLM:\System\CurrentControlSet\Services\LanManServer\Parameters' -Name 'NullSessionShares' -ErrorAction SilentlyContinue
if (-not $nullSessionShares -or $nullSessionShares.NullSessionShares -eq $null -or $nullSessionShares.NullSessionShares -eq '') { 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: Shares that can be accessed anonymously” to be defined but containing no entries (Blank).