Microsoft Internet Explorer Scripting Engine Remote Code Execution Vulnerability (CVE-2019-0752) Technical Analysis and Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTSystems running Internet Explorer 11 and legacy scripting engines on Windows platforms, including Windows 10
Successful exploitation allows remote attackers to execute arbitrary code in the context of the current user, potentially leading to full system compromise
Apply the latest Microsoft cumulative security updates and disable or transition away from legacy Internet Explorer to modern browsers
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the latest cumulative security updates provided by Microsoft. You can force Windows Update to scan and install missing security patches using PowerShell.
# Install Windows Update module and apply all pending security patches
Install-Module PSWindowsUpdate -Force -Verbose
Get-WindowsUpdate -AcceptAll -Install -AutoReboot2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, disable Internet Explorer 11 via the registry to mitigate the attack vector.
# Disable Internet Explorer 11 via Registry Policy
$RegistryPath = 'HKLM:\SOFTWARE\Policies\Microsoft\Internet Explorer\Main'
If (-not (Test-Path $RegistryPath)) {
New-Item -Path $RegistryPath -Force | Out-Null
}
New-ItemProperty -Path $RegistryPath -Name 'DisableInternetExplorer' -Value 1 -PropertyType DWord -Force3. Log Audit & IoC Verification Commands
Verify the file versions of critical scripting engine libraries to ensure they have been updated past the vulnerable thresholds.
# Check file versions of mshtml.dll and jscript.dll
$dlls = @('C:\Windows\System32\mshtml.dll', 'C:\Windows\System32\jscript.dll')
foreach ($dll in $dlls) {
if (Test-Path $dll) {
$versionInfo = (Get-Item $dll).VersionInfo
Write-Host 'File: ' $dll ' | Version: ' $versionInfo.FileVersion
} else {
Write-Host 'File not found: ' $dll
}
}Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2019-0752) is a Type Confusion (CWE-843) and memory corruption vulnerability that exists in the way the Microsoft Internet Explorer scripting engine (such as Chakra or JScript) handles objects in memory. The root cause lies in the engine's failure to properly validate object types or memory states during script execution, leading to unsafe memory access.
2. Exploitation Mechanics & Attack Scenario
An attacker exploits this vulnerability by hosting a specially crafted website containing malicious JavaScript designed to manipulate the browser's memory layout. When a victim visits the site (via phishing or watering hole attacks), the scripting engine processes the malicious code, triggering a type confusion state. This allows the attacker to bypass memory protections, gain read/write primitives, and execute arbitrary shellcode with the privileges of the logged-in user.
3. Infrastructure & Business Impact
As a CISA KEV-listed vulnerability, this flaw has been actively exploited in the wild. If an attacker successfully compromises an endpoint, they can establish an initial foothold within the enterprise network. Combined with local privilege escalation (LPE) techniques, this can lead to domain-wide compromise, data exfiltration, and ransomware deployment.
Official Vendor Advisories & References
A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka 'Scripting Engine Memory Corruption Vulnerability'. This CVE ID is unique from CVE-2019-0739, CVE-2019-0753, CVE-2019-0862.
Frequently Asked SecOps Questions (CVE-2019-0752)
FAQQ1. How critical is CVE-2019-0752 and is it actively exploited in the wild?
CVE-2019-0752 is rated CVSS 7.5 (HIGH) with a 30-day EPSS exploitation probability of 81.7%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2019-0752?
Primary impacted vendors include microsoft across internet_explorer, windows. Scope summary: Internet Explorer 11 on Windows 7, 8.1, 10, and Windows Server 2008, 2012, 2016, 2019
Q3. What temporary mitigations or workarounds exist for CVE-2019-0752 before patching?
[Mitigation] Apply the latest Microsoft cumulative security updates and disable or transition away from legacy Internet Explorer to modern browsers Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2019-0752
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