CVE-2019-1196
📋 TL;DR
This is a remote code execution vulnerability in Microsoft Edge's Chakra JavaScript engine that allows attackers to execute arbitrary code by tricking users into visiting malicious websites. It affects users running vulnerable versions of Microsoft Edge on Windows systems. Successful exploitation gives attackers the same privileges as the current user.
💻 Affected Systems
- Microsoft Edge (HTML-based)
📦 What is this software?
Edge by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative privileges, allowing installation of malware, data theft, and creation of new accounts.
Likely Case
Attacker gains user-level access to the system, potentially leading to credential theft, data exfiltration, or lateral movement.
If Mitigated
Limited impact with proper browser sandboxing and user privilege restrictions, potentially contained to browser process.
🎯 Exploit Status
Exploitation requires user to visit malicious website but no authentication needed. Memory corruption vulnerability requires specific conditions to achieve reliable code execution.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Microsoft Edge version with August 2019 security updates
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1196
Restart Required: Yes
Instructions:
1. Open Windows Settings 2. Go to Update & Security 3. Click Check for updates 4. Install all available updates 5. Restart computer when prompted
🔧 Temporary Workarounds
Disable JavaScript in Microsoft Edge
windowsPrevents exploitation by disabling JavaScript execution, but breaks most modern websites
Settings → View advanced settings → Privacy and services → JavaScript → Off
Use Application Control
windowsRestrict execution of unauthorized applications to prevent payload execution
🧯 If You Can't Patch
- Switch to Chromium-based Microsoft Edge or alternative browser
- Implement network filtering to block known malicious websites and restrict web browsing
🔍 How to Verify
Check if Vulnerable:
Check Microsoft Edge version in Settings → About Microsoft Edge. If version is prior to August 2019 updates, system is vulnerable.Check Version:
msedge://settings/helpVerify Fix Applied:
Verify Windows Update history shows August 2019 security updates installed and Microsoft Edge version is updated.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from Microsoft Edge
- Suspicious network connections from browser to unknown IPs
- Crash reports from Microsoft Edge
Network Indicators:
- HTTP requests to known exploit domains
- Unusual outbound connections following web browsing
SIEM Query:
Process Creation where ParentImage contains 'msedge.exe' AND CommandLine contains suspicious patterns