CVE-2019-0593
📋 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 compromise 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 lateral movement within the network.
If Mitigated
Limited impact with proper patch management and browser sandboxing preventing full system compromise.
🎯 Exploit Status
Exploitation requires user interaction such as visiting a malicious website. The vulnerability is in the scripting engine memory handling.
🛠️ 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-2019-0593
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Check for updates. 3. Install the February 2019 security update for Microsoft Edge. 4. Restart the computer to complete installation.
🔧 Temporary Workarounds
Disable JavaScript
windowsDisable JavaScript in Microsoft Edge to prevent exploitation via malicious scripts
Use Enhanced Protected Mode
windowsEnable Enhanced Protected Mode in Microsoft Edge for additional sandboxing
🧯 If You Can't Patch
- Migrate to Chromium-based Microsoft Edge which is not affected by this vulnerability
- Implement application whitelisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check Microsoft Edge version in Settings > About Microsoft Edge. If version is prior to the February 2019 update, the system is vulnerable.Check Version:
msedge --versionVerify Fix Applied:
Verify Windows Update history shows the February 2019 security update for Microsoft Edge is installed.📡 Detection & Monitoring
Log Indicators:
- Unexpected Edge crashes
- Suspicious process creation from Edge
- Memory access violations in Edge logs
Network Indicators:
- Connections to known malicious domains from Edge
- Unusual outbound traffic patterns
SIEM Query:
Process Creation where ParentImage contains 'msedge.exe' and CommandLine contains suspicious patterns