CVE-2020-0848
📋 TL;DR
This is a remote code execution vulnerability in ChakraCore, Microsoft's JavaScript engine used in Edge browser. Attackers can exploit memory corruption to execute arbitrary code on affected systems. Users running vulnerable versions of Microsoft Edge are primarily affected.
💻 Affected Systems
- Microsoft Edge
- ChakraCore
📦 What is this software?
Chakracore by Microsoft
Edge by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install programs, view/change/delete data, or create new accounts with full user rights.
Likely Case
Browser compromise leading to data theft, malware installation, or system takeover when users visit malicious websites.
If Mitigated
Limited impact with proper browser sandboxing and security controls in place, potentially containing exploitation to browser process.
🎯 Exploit Status
Memory corruption vulnerabilities in scripting engines are frequently exploited in the wild, though no specific weaponization of this CVE has been confirmed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: March 2020 security updates for Windows 10 and Windows Server
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0848
Restart Required: Yes
Instructions:
1. Apply Windows Update for March 2020 security patches. 2. Ensure Microsoft Edge is updated through Windows Update. 3. Restart system to complete installation.
🔧 Temporary Workarounds
Disable JavaScript
windowsDisable JavaScript in Microsoft Edge to prevent exploitation, though this breaks most web functionality.
Switch to Chromium-based Edge
windowsMigrate to the newer Chromium-based Microsoft Edge which is not affected by this vulnerability.
🧯 If You Can't Patch
- Implement application whitelisting to prevent unauthorized code execution
- Use network segmentation to isolate vulnerable systems and restrict browser access to untrusted content
🔍 How to Verify
Check if Vulnerable:
Check Microsoft Edge version: Open Edge → Settings → About Microsoft Edge. If version is before the March 2020 update, system is vulnerable.Check Version:
In Edge browser address bar, type: edge://settings/helpVerify Fix Applied:
Verify Windows Update history shows March 2020 security updates installed and Edge version is updated.📡 Detection & Monitoring
Log Indicators:
- Unexpected Edge crashes
- Suspicious process creation from Edge
- Memory access violations in Edge process
Network Indicators:
- Unusual outbound connections from Edge browser
- Traffic to known malicious domains
SIEM Query:
Process Creation where (ParentImage contains "msedge.exe" OR Image contains "msedge.exe") AND CommandLine contains suspicious patterns