CVE-2020-1260
📋 TL;DR
This vulnerability allows remote code execution through the VBScript engine when it improperly handles objects in memory. Attackers can exploit this by tricking users into viewing specially crafted content, potentially taking control of affected systems. This primarily affects Windows systems with Internet Explorer or applications using the VBScript engine.
💻 Affected Systems
- Windows 10
- Windows Server 2016
- Windows Server 2019
- Internet Explorer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control, data theft, ransomware deployment, and lateral movement across the network.
Likely Case
Malware installation, credential theft, and system compromise when users visit malicious websites or open crafted documents.
If Mitigated
Limited impact with proper patching, application control, and user education preventing successful exploitation.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious site or opening crafted content). No public exploit code was available at advisory publication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security updates from June 2020
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1260
Restart Required: Yes
Instructions:
1. Apply Microsoft security updates from June 2020. 2. Use Windows Update or download from Microsoft Update Catalog. 3. Restart system after installation.
🔧 Temporary Workarounds
Disable VBScript in Internet Explorer
windowsPrevents VBScript execution in Internet Explorer, mitigating the vulnerability
Set registry key: HKLM\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{B54F3741-5B07-11CF-A4B0-00AA004A55E8} with Compatibility Flags = 0x400
Restrict Internet Explorer to Internet Zone
windowsLimits VBScript execution to trusted sites only
Configure Internet Explorer security settings via Group Policy or local settings
🧯 If You Can't Patch
- Implement application control to block unauthorized VBScript execution
- Educate users about risks of opening untrusted content and visiting unknown websites
🔍 How to Verify
Check if Vulnerable:
Check if June 2020 security updates are installed via Windows Update history or systeminfo commandCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify KB4560960 (Windows 10 1903/1909) or corresponding security update is installed📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing script execution errors
- Process creation events for unexpected scripting hosts
Network Indicators:
- HTTP requests to known malicious domains serving crafted content
- Unusual outbound connections after visiting websites
SIEM Query:
EventID=4688 AND (NewProcessName="*cscript.exe" OR NewProcessName="*wscript.exe") AND CommandLine CONTAINS suspicious.vbs