SV-45306r1: Security Warning for unsafe files must be set to prompt (Internet zone). | Microsoft Internet Explorer 10 Security Technical Implementation Guide

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Assessment Title

Rule Text

Security Warning for unsafe files must be set to prompt (Internet zone).

Description

Discussion Text

This policy setting controls whether or not the "Open File - Security Warning" message appears when the user tries to open executable files or other potentially unsafe files (from an intranet file shared by using Windows Explorer, for example). If you enable this policy setting and set the drop-down box to Enable, these files open without a security warning. If you set the drop-down box to Prompt, a security warning appears before the files open. If you disable this policy these files do not open. If you do not configure this policy setting, the user can configure how the computer handles these files.

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

Additional Details

Responsibility

System Administrator

References

DPMS Target IE Version 10 DISA DPMS Target IE Version 10 2351

Checks

OVAL

oval:mil.disa.fso.ie:var:37100 ← xccdf_mil.disa.stig_value_LaunchingProgramsAndUnsafeFiles_InternetZone_LocalComputer_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.ie:def:371
# Security Warning for unsafe files must be set to prompt (Internet zone).
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Computer Configuration\Network\Internet Explorer\Internet Control Panel\Security Page\Internet Zone\Launching programs and unsafe files
# 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\CurrentVersion\Internet Settings\Zones\3').GetValueKind('1806').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3' -Name '1806' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty '1806') -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 ms_ie10 target this check assesses.

$regPath = "HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3"
if (Test-Path $regPath) {
    $regData = Get-ItemProperty -Path $regPath -ErrorAction SilentlyContinue
    if ($regData -and $regData.Item -eq 1) {
        Write-Output "PASS"
        exit 0
    }
}
Write-Output "FAIL"
exit 1

Remediation

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Internet Zone -> "Show security warning for potentially unsafe files" to "Enabled", and select "Prompt" from the drop-down box.