CVE-2020-0824
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected systems by exploiting memory corruption in Internet Explorer. Attackers can compromise user systems by tricking victims into viewing specially crafted web content. This affects users running vulnerable versions of Internet Explorer on Windows systems.
💻 Affected Systems
- Internet Explorer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's computer, enabling data theft, ransomware deployment, or lateral movement within networks.
Likely Case
Malware installation leading to credential theft, data exfiltration, or system disruption for individual users.
If Mitigated
Limited impact with proper security controls like application whitelisting, memory protection, and network segmentation preventing successful exploitation.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious website). No public exploit code was available at disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: March 2020 Security Updates
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0824
Restart Required: Yes
Instructions:
1. Apply March 2020 Windows security updates via Windows Update. 2. For enterprise: Deploy through WSUS or SCCM. 3. Verify patch installation in Windows Update history.
🔧 Temporary Workarounds
Disable Internet Explorer
windowsDisable or restrict Internet Explorer usage in favor of Microsoft Edge or other modern browsers.
Disable via Group Policy: Computer Configuration > Administrative Templates > Windows Components > Internet Explorer
Enable Enhanced Protected Mode
windowsEnable Enhanced Protected Mode in Internet Explorer settings to add memory protection layers.
Internet Options > Advanced tab > Enable Enhanced Protected Mode
🧯 If You Can't Patch
- Implement application control policies to block unauthorized code execution
- Use network segmentation to isolate Internet Explorer usage to specific segments
🔍 How to Verify
Check if Vulnerable:
Check Internet Explorer version (Help > About) and compare with patched versions. Systems without March 2020 updates are vulnerable.Check Version:
wmic qfe list | findstr KB4540673Verify Fix Applied:
Verify KB4540673 (Windows 10) or equivalent March 2020 security update is installed via Windows Update history or 'wmic qfe list' command.📡 Detection & Monitoring
Log Indicators:
- Internet Explorer crash events in Windows Event Logs
- Unexpected process creation from iexplore.exe
- Memory access violation errors
Network Indicators:
- Unusual outbound connections from Internet Explorer processes
- Traffic to known malicious domains
SIEM Query:
EventID=1000 OR EventID=1001 AND ProcessName="iexplore.exe" | stats count by host