CVE-2019-0642
📋 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 attacker gaining full control, data theft, ransomware deployment, or lateral movement across the network.
Likely Case
Malicious code execution in browser context leading to credential theft, session hijacking, or malware installation.
If Mitigated
Limited impact with proper browser sandboxing and security controls preventing full system compromise.
🎯 Exploit Status
Exploitation requires memory corruption techniques but no authentication is needed - user just needs to visit malicious site.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: February 2019 security update for Microsoft Edge
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0642
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Check for updates. 3. Install February 2019 security updates. 4. Restart system to complete installation.
🔧 Temporary Workarounds
Disable JavaScript
windowsDisable JavaScript in Microsoft Edge to prevent exploitation of scripting engine vulnerabilities
Use Enhanced Security Configuration
windowsEnable Enhanced Security Configuration for Internet Explorer mode in Edge
🧯 If You Can't Patch
- Migrate to Chromium-based Microsoft Edge which is not affected
- Implement application whitelisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check Edge version via edge://settings/help and verify it's older than February 2019 updatesCheck Version:
Get-AppxPackage Microsoft.MicrosoftEdge | Select VersionVerify Fix Applied:
Verify Windows Update history shows February 2019 security updates installed for Microsoft Edge📡 Detection & Monitoring
Log Indicators:
- Edge crash reports with memory corruption signatures
- Unexpected process creation from Edge
Network Indicators:
- Connections to known malicious domains from Edge process
- Unusual outbound traffic patterns
SIEM Query:
Process Creation where Parent Process contains 'MicrosoftEdge' and Command Line contains suspicious patterns