CVE-2019-0914
📋 TL;DR
A memory corruption vulnerability in Microsoft Edge's Chakra JavaScript engine allows remote attackers to execute arbitrary code on affected systems. This affects users running vulnerable versions of Microsoft Edge on Windows 10 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 over the victim's machine, enabling data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Browser compromise leading to session hijacking, credential theft, and installation of malware or spyware on the victim's system.
If Mitigated
Limited impact due to browser sandboxing and modern exploit mitigations, potentially resulting in browser crash rather than code execution.
🎯 Exploit Status
Memory corruption vulnerabilities typically require sophisticated exploitation techniques to bypass modern mitigations like ASLR and DEP.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Microsoft Edge version with May 2019 security updates (EdgeHTML 44.17763.771.0)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0914
Restart Required: Yes
Instructions:
1. Open Windows Settings > Update & Security > Windows Update. 2. Click 'Check for updates'. 3. Install all available updates, particularly the May 2019 cumulative update for Windows 10. 4. Restart your computer when prompted.
🔧 Temporary Workarounds
Disable JavaScript in Microsoft Edge
windowsTemporarily disable JavaScript execution to prevent exploitation while awaiting patch deployment
1. Open Microsoft Edge > Settings > View advanced settings
2. Under 'Privacy and services', toggle 'JavaScript' to Off
Use Enhanced Protected Mode
windowsEnable Enhanced Protected Mode to add additional sandboxing layers
1. Open Internet Options (inetcpl.cpl)
2. Go to Advanced tab
3. Under Security, check 'Enable Enhanced Protected Mode'
4. Apply and restart Edge
🧯 If You Can't Patch
- Switch to alternative browsers like Chrome or Firefox until patching is possible
- Implement network filtering to block known malicious domains and restrict access to untrusted websites
🔍 How to Verify
Check if Vulnerable:
Check Microsoft Edge version by navigating to edge://settings/help and comparing against patched version (44.17763.771.0 or later)Check Version:
In Microsoft Edge address bar, type: edge://settings/helpVerify Fix Applied:
Verify Windows Update history shows May 2019 cumulative update (KB4494441 or similar) installed successfully📡 Detection & Monitoring
Log Indicators:
- Unexpected Edge crashes with memory access violation errors
- Suspicious JavaScript execution patterns in browser logs
Network Indicators:
- Connections to known exploit kit domains following Edge usage
- Unusual outbound traffic patterns from Edge processes
SIEM Query:
EventID=1000 OR EventID=1001 Source=Application Error ProcessName=MicrosoftEdge.exe FaultingModuleName=chakra.dll