SV-25059r1: The Windows SMB server is not enabled to always perform SMB packet signing. | Windows 7 Security Technical Implementation Guide

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Assessment Title

Rule Text

The Windows SMB server is not enabled to always perform SMB packet signing.

Description

Discussion Text

If this policy is enabled, it causes the Windows Server Message Block (SMB) server to always perform SMB packet signing.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002418Not mappedCCI-002421CCE-9040-7

Additional Details

Potential Impacts

If the environment is a mixed one, with down-level OSs or maintains trusts with down-level OSs, then configuring this to the required setting could cause compatibility problems.

Third-Party Tools

Responsibility

System Administrator

References

DPMS Target Windows 7 DISA DPMS Target Windows 7 1712

Checks

OVAL

oval:mil.disa.fso.windows:var:370000 ← xccdf_mil.disa.stig_value_digitally_sign_communications_server_always_var

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:3700
# The Windows SMB server is not enabled to always perform SMB packet signing.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Microsoft network server: Digitally sign communications (always)' is set to 'Enabled'
# 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('RequireSecuritySignature').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters' -Name 'RequireSecuritySignature' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'RequireSecuritySignature') -eq 1))
}

if (test_1) {
  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:3700
$registryPath = "HKLM:\System\CurrentControlSet\Services\LanmanServer\Parameters"
$registryKey = "RequireSecuritySignature"
$expectedValue = 1

if (Test-Path $registryPath -ErrorAction SilentlyContinue) {
    $registryValue = (Get-ItemProperty -Path $registryPath -Name $registryKey -ErrorAction SilentlyContinue).$registryKey
    if ($registryValue -eq $expectedValue) {
        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 -> “Microsoft Network Server: Digitally sign communications (always)” to “Enabled”.