SV-220858r991589: Users must be notified if a web-based program attempts to install software. | Microsoft Windows 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

Users must be notified if a web-based program attempts to install software.

Description

Discussion Text

Web-based programs may attempt to install malicious software on a system. Ensuring users are notified if a web-based program attempts to install software allows them to refuse the installation.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366V-63329SV-77819

References

DPMS Target Microsoft Windows 10 DISA DPMS Target Microsoft Windows 10 4072

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.stig.windows10:def:220858
# Users must be notified if a web-based program attempts to install software.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Prevent Internet Explorer security prompt for Windows Installer scripts' is set to 'Not Configured' or 'Disabled'
# 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\Software\Policies\Microsoft\Windows\Installer').GetValueKind('SafeForScripting').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Installer' -Name 'SafeForScripting' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'SafeForScripting') -eq 0))
}

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 ms_windows_10 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows10:def:220858
$compliant = Test-Path -Path "HKLM:\Software\Policies\Microsoft\Windows\Installer\SafeForScripting" -ErrorAction SilentlyContinue; if ($compliant) { $value = Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows\Installer\SafeForScripting" -ErrorAction SilentlyContinue; if ($value.PSObject.Properties.Name -notcontains "PreventInternetExplorerSecurityPrompt") { $compliant = $false } } if ($compliant -eq $true -and $value.PreventInternetExplorerSecurityPrompt -eq 0) { Write-Output "PASS"; Exit 0 } else { Write-Output "FAIL"; Exit 1 }

Remediation

The default behavior is for Internet Explorer to warn users and select whether to allow or refuse installation when a web-based program attempts to install software on the system.

If this needs to be corrected, configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Installer >> "Prevent Internet Explorer security prompt for Windows Installer scripts" to "Not Configured" or "Disabled".