CVE-2019-0644
📋 TL;DR
This is a remote code execution vulnerability in Microsoft Edge's scripting engine that allows attackers to execute arbitrary code by exploiting memory corruption when handling objects. It affects users running vulnerable versions of Microsoft Edge on Windows systems. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- Microsoft Edge
📦 What is this software?
Chakracore by Microsoft
Edge by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with administrative privileges, data theft, ransomware deployment, and persistent backdoor installation.
Likely Case
Browser compromise leading to session hijacking, credential theft, and installation of malware on the user's system.
If Mitigated
Limited impact due to browser sandboxing and security controls, potentially only browser crash or limited data exposure.
🎯 Exploit Status
Exploitation requires memory corruption techniques but can be triggered via normal web browsing without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Microsoft Edge versions with February 2019 security updates (KB4487026, KB4487020, etc.)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0644
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Check for updates. 3. Install all available security updates. 4. Restart the system when prompted.
🔧 Temporary Workarounds
Disable JavaScript
windowsPrevents exploitation by disabling JavaScript execution in Edge
edge://settings/content/javascript
Use Enhanced Security Configuration
windowsEnable Internet Explorer Enhanced Security Configuration for Edge compatibility mode
Control Panel > Internet Options > Security > Enable Enhanced Protected Mode
🧯 If You Can't Patch
- Migrate to Chromium-based Microsoft Edge which is not affected
- Use alternative browsers like Chrome or Firefox until patching is possible
🔍 How to Verify
Check if Vulnerable:
Check Edge version via edge://settings/help and verify it's older than February 2019 updatesCheck Version:
edge://settings/help or Get-AppxPackage Microsoft.MicrosoftEdge | Select VersionVerify Fix Applied:
Verify Windows Update history shows February 2019 security updates installed and Edge version is updated📡 Detection & Monitoring
Log Indicators:
- Edge crash reports with memory corruption errors
- Unexpected process creation from Edge
Network Indicators:
- Connections to suspicious domains following Edge usage
- Unusual outbound traffic patterns
SIEM Query:
Process Creation where (ParentImage contains 'MicrosoftEdge.exe' OR Image contains 'MicrosoftEdge.exe') AND CommandLine contains suspicious patterns