CVE-2020-1060
📋 TL;DR
This vulnerability allows remote code execution through malicious VBScript content, enabling attackers to take control of affected systems. It affects Windows systems with Internet Explorer or applications using the VBScript engine. The vulnerability is particularly dangerous when users visit compromised websites or open malicious documents.
💻 Affected Systems
- Windows 10
- Windows Server 2016
- Windows Server 2019
- Windows Server 2012
- Windows Server 2012 R2
- Windows 8.1
- Windows RT 8.1
- Windows 7
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative privileges, data theft, ransomware deployment, and lateral movement across networks.
Likely Case
Malware installation, credential theft, and persistence establishment on individual workstations.
If Mitigated
Limited impact with proper application whitelisting, restricted user privileges, and network segmentation.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious content) but no authentication. Multiple exploit chains have been observed in the wild.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: May 2020 security updates (KB4556799, KB4556813, etc.)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1060
Restart Required: Yes
Instructions:
1. Apply May 2020 Windows security updates via Windows Update. 2. For enterprise: Deploy through WSUS or SCCM. 3. Verify update installation with wmic qfe list. 4. Restart systems as required.
🔧 Temporary Workarounds
Disable VBScript in Internet Explorer
windowsPrevents VBScript execution in Internet Explorer browser
Set registry key: HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3\1400 = 3
Or use Group Policy: Computer Configuration > Administrative Templates > Windows Components > Internet Explorer > Internet Control Panel > Security Page > Turn off script execution (Internet Explorer)
Restrict Office VBA Macros
windowsPrevents VBScript execution in Office documents
Set registry key: HKCU\Software\Microsoft\Office\16.0\Excel\Security\AccessVBOM = 0
Use Group Policy: Block macros from running in Office files from the internet
🧯 If You Can't Patch
- Implement application control/whitelisting to prevent unauthorized script execution
- Use network segmentation to isolate vulnerable systems and restrict internet access
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for May 2020 security updates or run: wmic qfe list | findstr KB4556799Check Version:
wmic os get caption,version,buildnumberVerify Fix Applied:
Verify KB4556799 or equivalent May 2020 update is installed and system has been restarted📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs: Process creation from script hosts (cscript.exe, wscript.exe)
- Security logs: Unexpected PowerShell or cmd.exe execution from script contexts
- Application logs: Internet Explorer crashes or unusual script errors
Network Indicators:
- Outbound connections from script hosts to unknown IPs
- DNS requests for suspicious domains from workstations
SIEM Query:
source="windows" (process_name="cscript.exe" OR process_name="wscript.exe") AND (parent_process="iexplore.exe" OR parent_process="winword.exe" OR parent_process="excel.exe")