SV-45158r1: Font downloads must be disallowed (Internet zone). | Microsoft Internet Explorer 10 Security Technical Implementation Guide

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Assessment Title

Rule Text

Font downloads must be disallowed (Internet zone).

Description

Discussion Text

Downloads of fonts can sometimes contain malicious code. It is possible that a font could include malformed data that would cause Internet Explorer to crash when it attempts to load and render the font. This policy setting allows you to manage whether pages of the zone may download HTML fonts. If you enable this policy setting, HTML fonts can be downloaded automatically. If you enable this policy setting and Prompt is selected in the drop-down box, users are queried whether to allow HTML fonts to download. If you disable this policy setting, HTML fonts are prevented from downloading.

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:26900 ← xccdf_mil.disa.stig_value_AllowFontDownloads_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:269
# Font downloads must be disallowed (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\Allow font downloads
# 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('1604').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3' -Name '1604' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty '1604') -eq 3))
}

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.

# OVAL Definition: oval:mil.disa.fso.ie:def:269
$regPath = "HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3\1604"
if (Test-Path $regPath) {
    $regValue = (Get-ItemProperty -Path $regPath).Value
    if ($regValue -eq 3) {
        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 -> "Allow font downloads" to "Enabled", and select "Disable" from the drop-down box.