SV-223076r961092: Software must be disallowed to run or install with invalid signatures. | Microsoft Internet Explorer 11 STIG SCAP Benchmark

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Assessment Title

Rule Text

Software must be disallowed to run or install with invalid signatures.

Description

Discussion Text

Microsoft ActiveX controls and file downloads often have digital signatures attached that certify the file's integrity and the identity of the signer (creator) of the software. Such signatures help ensure unmodified software is downloaded and the user can positively identify the signer to determine whether you trust them enough to run their software.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001170SV-59489V-46625

References

DPMS Target Microsoft Internet Explorer 11 DISA DPMS Target Microsoft Internet Explorer 11 4095

Checks

OVAL

oval:mil.disa.fso.ie:var:45900 ← xccdf_mil.disa.stig_value_AllowSoftwareRunInstallSignatureInvalid_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:459
# Software must be disallowed to run or install with invalid signatures.
# 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\Advanced Page \Allow Software to Run or Install Even if the Signature is Invalid
# 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\Internet Explorer\Download').GetValueKind('RunInvalidSignatures').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Internet Explorer\Download' -Name 'RunInvalidSignatures' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'RunInvalidSignatures') -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_ie11 target this check assesses.

# OVAL Definition: oval:mil.disa.fso.ie:def:459
$regPath = "HKLM:\Software\Policies\Microsoft\Internet Explorer\Download"
$regKey = "RunInvalidSignatures"
$regValue = 0
if (-Not (Test-Path $regPath)) { $compliant = $true } else {
    $regData = Get-ItemProperty -Path $regPath -Name $regKey -ErrorAction SilentlyContinue
    $compliant = ($regData.$regKey -eq $regValue)
}
if ($compliant) { "PASS"; Exit 0 } else { "FAIL"; Exit 1 }

Remediation

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Advanced Page -> 'Allow software to run or install even if the signature is invalid' to 'Disabled'.