SV-25040r1: Outgoing secure channel traffic is not signed when possible. | Windows 7 Security Technical Implementation Guide

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Assessment Title

Rule Text

Outgoing secure channel traffic is not signed when possible.

Description

Discussion Text

Requests sent on the secure channel are authenticated, and sensitive information (such as passwords) is encrypted, but the channel is not integrity checked. If this policy is enabled, all outgoing secure channel traffic should be signed.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002418Not mappedCCI-002421CCE-9375-7

Additional Details

False Positives

If the value for “Domain Member: Digitally encrypt or sign secure channel data (always)” is set to “Enabled”, then this would not be a finding.

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:368600 ← xccdf_mil.disa.stig_value_digitally_sign_secure_channel_data_when_possible_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:3686
# Outgoing secure channel traffic is not signed when possible.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Domain member: Digitally sign secure channel data (when possible)' 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\Netlogon\Parameters').GetValueKind('SignSecureChannel').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Netlogon\Parameters' -Name 'SignSecureChannel' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'SignSecureChannel') -eq 1))
}
# Verifies 'Domain member: Digitally encrypt or sign secure channel data (always)' is set to 'Enabled'
# 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\Netlogon\Parameters').GetValueKind('RequireSignOrSeal').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Netlogon\Parameters' -Name 'RequireSignOrSeal' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'RequireSignOrSeal') -eq 1))
}

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:3686
$compliant = ((Get-ItemProperty -Path "HKLM:\System\CurrentControlSet\Services\Netlogon\Parameters" -Name "SignSecureChannel" -ErrorAction SilentlyContinue).SignSecureChannel -eq 1) -or ((Get-ItemProperty -Path "HKLM:\System\CurrentControlSet\Services\Netlogon\Parameters" -Name "RequireSignOrSeal" -ErrorAction SilentlyContinue).RequireSignOrSeal -eq 1)
if ($compliant) { 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 -> “Domain Member: Digitally sign secure channel data (when possible)” to “Enabled”.