Microsoft Internet Explorer Memory Corruption Remote Code Execution Vulnerability (CVE-2017-0149)
Executive & SecOps Summary
SECOPS ASSESSMENTMicrosoft Internet Explorer versions 9 through 11
Remote attackers can execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site
Apply official Microsoft security updates, disable Internet Explorer, and transition to modern browsers like Microsoft Edge
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Since Internet Explorer has reached End of Life (EOL), systems should be updated to the latest Windows Cumulative Updates, and users should transition to Microsoft Edge. Use the following PowerShell commands to force Windows Updates:
# 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 immediate patching is not feasible, disable Internet Explorer 11 using Group Policy or the registry to mitigate the attack vector:
# Disable Internet Explorer 11 standalone browser via Registry
$RegistryPath = 'HKLM:\SOFTWARE\Policies\Microsoft\Internet Explorer\Main'
if (-not (Test-Path $RegistryPath)) {
New-Item -Path $RegistryPath -Force
}
Set-ItemProperty -Path $RegistryPath -Name 'DisableIE11' -Value 'Yes' -Type String3. Log Audit & IoC Verification Commands
Run the following PowerShell script to audit the installed Internet Explorer version and check for active processes:
# Retrieve the installed Internet Explorer version
$IEVersion = (Get-ItemProperty 'HKLM:\Software\Microsoft\Internet Explorer').Version
Write-Output 'Installed IE Version: ' $IEVersion
# Check for running Internet Explorer processes
Get-Process -Name iexplore -ErrorAction SilentlyContinue | Select-Object Id, ProcessName, PathBlock 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-2017-0149) is a memory corruption vulnerability existing in Microsoft Internet Explorer 9, 10, and 11. It is caused by the rendering engine improperly handling objects in memory, leading to an Out-of-bounds Write (CWE-787) condition.
2. Exploitation Mechanics & Attack Scenario
An attacker hosts a specially crafted website containing malicious HTML, JavaScript, or CSS. When a user is enticed to visit this website (via phishing or watering hole attacks), the browser processes the malicious content, triggering memory corruption. This allows the attacker to manipulate the memory layout, inject shellcode, and execute it with the privileges of the current user.
3. Infrastructure & Business Impact
As this vulnerability is listed in the CISA KEV catalog, it has been actively exploited in the wild. Successful exploitation allows complete system compromise, enabling attackers to establish a foothold, move laterally within the network, and deploy ransomware or exfiltrate sensitive data.
Official Vendor Advisories & References
Microsoft Internet Explorer 9 through 11 allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability." This vulnerability is different from those described in CVE-2017-0018 and CVE-2017-0037.
Frequently Asked SecOps Questions (CVE-2017-0149)
FAQQ1. How critical is CVE-2017-0149 and is it actively exploited in the wild?
CVE-2017-0149 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 28.5%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2017-0149?
Primary impacted vendors include microsoft across internet explorer. Scope summary: Microsoft Internet Explorer 9, 10, and 11 on supported Windows client and server operating systems
Q3. What temporary mitigations or workarounds exist for CVE-2017-0149 before patching?
[Mitigation] Apply official Microsoft security updates, disable Internet Explorer, and transition to modern browsers like Microsoft Edge 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-2017-0149
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
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