CVE-2020-0830
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected systems by exploiting a memory corruption flaw in Microsoft browser scripting engines. Attackers can compromise systems by tricking users into visiting malicious websites. This affects users of Microsoft browsers on Windows systems.
💻 Affected Systems
- Microsoft Edge
- Internet Explorer
📦 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
Attackers gain user-level access to execute code, steal data, or install malware through drive-by downloads.
If Mitigated
With proper controls, impact limited to isolated browser process with no system-wide access.
🎯 Exploit Status
Memory corruption vulnerabilities in scripting engines are frequently exploited in the wild. No public exploit code was disclosed at time of advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: March 2020 security updates (KB4540670 for Windows 10 1909, etc.)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0830
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Click 'Check for updates'. 3. Install March 2020 security updates. 4. Restart system when prompted.
🔧 Temporary Workarounds
Disable scripting in Internet Explorer
windowsConfigure Internet Explorer to disable active scripting or run in Enhanced Security Configuration
Internet Options → Security tab → Custom level → Scripting → Disable Active Scripting
Use alternative browser
allSwitch to Chrome, Firefox, or updated Edge Chromium browser
🧯 If You Can't Patch
- Implement application whitelisting to prevent unauthorized code execution
- Use network segmentation to isolate browser traffic and limit lateral movement
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for March 2020 security updates or run 'wmic qfe list' to see installed patchesCheck Version:
wmic qfe list | findstr KB4540670Verify Fix Applied:
Verify KB4540670 (or equivalent for your Windows version) is installed in Windows Update history📡 Detection & Monitoring
Log Indicators:
- Unexpected browser crashes
- Suspicious process creation from browser processes
- Unusual network connections from browser
Network Indicators:
- Traffic to known malicious domains hosting exploit code
- Unusual JavaScript execution patterns
SIEM Query:
EventID=1 AND (ParentImage LIKE '%iexplore.exe%' OR ParentImage LIKE '%MicrosoftEdge.exe%') AND CommandLine CONTAINS 'powershell' OR CommandLine CONTAINS 'cmd'