CVE-2019-1367
📋 TL;DR
This is a remote code execution vulnerability in Internet Explorer's scripting engine that allows attackers to execute arbitrary code on affected systems. It affects users running vulnerable versions of Internet Explorer on Windows systems. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- Internet Explorer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with administrative privileges, data theft, ransomware deployment, and lateral movement within the network.
Likely Case
Malware installation, credential theft, and system compromise leading to data exfiltration or botnet recruitment.
If Mitigated
Limited impact with proper network segmentation, application whitelisting, and user privilege restrictions.
🎯 Exploit Status
This vulnerability has been actively exploited in the wild. Attackers can exploit it by tricking users to visit malicious websites.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: October 2019 security updates (KB4519976, KB4520004, KB4520007, etc.)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1367
Restart Required: Yes
Instructions:
1. Apply the October 2019 security updates from Microsoft. 2. Restart affected systems. 3. Verify the patch is installed via Windows Update history.
🔧 Temporary Workarounds
Disable Internet Explorer scripting
windowsDisable Active Scripting in Internet Explorer to prevent exploitation
Set Internet Options > Security > Custom Level > Scripting > Active Scripting to Disable
Restrict Internet Explorer access
windowsUse Group Policy to restrict Internet Explorer usage or disable it entirely
gpedit.msc > Computer Configuration > Administrative Templates > Windows Components > Internet Explorer
🧯 If You Can't Patch
- Disable Internet Explorer and use alternative browsers like Microsoft Edge or Chrome
- Implement application whitelisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check Internet Explorer version via Help > About Internet Explorer. If version is 9, 10, or 11 without October 2019 updates, system is vulnerable.Check Version:
wmic datafile where name="C:\\Program Files\\Internet Explorer\\iexplore.exe" get versionVerify Fix Applied:
Check Windows Update history for October 2019 security updates (KB4519976, KB4520004, KB4520007, etc.)📡 Detection & Monitoring
Log Indicators:
- Internet Explorer crash logs with memory corruption errors
- Windows Event Logs showing unexpected process creation
Network Indicators:
- Outbound connections from Internet Explorer to suspicious IPs
- HTTP requests to known exploit domains
SIEM Query:
source="Windows Security" AND event_id=4688 AND process_name="iexplore.exe" AND parent_process NOT IN ("explorer.exe", "userinit.exe")