SV-50060r5: The Enhanced Mitigation Experience Toolkit (EMET) system-wide Structured Exception Handler Overwrite Protection (SEHOP) must be configured to Application Opt Out. | Windows Vista Security Technical Implementation Guide

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Assessment Title

Rule Text

The Enhanced Mitigation Experience Toolkit (EMET) system-wide Structured Exception Handler Overwrite Protection (SEHOP) must be configured to Application Opt Out.

Description

Discussion Text

Attackers are constantly looking for vulnerabilities in systems and applications. The Enhanced Mitigation Experience Toolkit can enable several mechanisms, such as Data Execution Prevention (DEP), Address Space Layout Randomization (ASLR), and Structured Exception Handler Overwrite Protection (SEHOP) on the system and applications adding additional levels of protection.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002824

References

DPMS Target Windows Vista DISA DPMS Target Windows Vista 1029

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:4288
# The Enhanced Mitigation Experience Toolkit (EMET) system-wide Structured Exception Handler Overwrite Protection (SEHOP) must be configured to Application Opt Out.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# EMET system-wide SEHOP must be 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\Software\Policies\Microsoft\EMET\SysSettings').GetValueKind('SEHOP').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\EMET\SysSettings' -Name 'SEHOP' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'SEHOP') -eq 2))
}

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 windows_vista target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:4288
$compliant = (Test-Path "HKLM:\Software\Policies\Microsoft\EMET\SysSettings\SEHOP" -and (Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\EMET\SysSettings\SEHOP").value -eq 2); if ($compliant) {Write-Output "PASS"; exit 0} else {Write-Output "FAIL"; exit 1}

Remediation

This is applicable to unclassified systems, for other systems this is NA.

Configure the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> EMET -> "System SEHOP" to "Enabled" with "Application Opt-Out" selected.

The Enhanced Mitigation Experience Toolkit must be installed on the system and the administrative template files added to make this setting available.

Document applications that do not function properly due to this setting, and are opted out, with the ISSO.

Opted out exceptions can be configured with the following command:
EMET_Conf --Set "application path\executable name" -SEHOP