CVE-2020-1119
📋 TL;DR
CVE-2020-1119 is an information disclosure vulnerability in Windows StartTileData.dll that could allow an attacker to read sensitive memory contents. This affects Windows systems where an attacker has local access and can run a crafted application. The vulnerability could provide information useful for further system compromise.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could read sensitive memory contents, potentially obtaining credentials, encryption keys, or other sensitive data that could lead to full system compromise.
Likely Case
Local information disclosure that could aid in privilege escalation or lateral movement within a compromised environment.
If Mitigated
Minimal impact with proper access controls preventing unauthorized local execution.
🎯 Exploit Status
Requires local access and ability to execute specially crafted code. No known public exploits as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: May 2020 security updates
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1119
Restart Required: Yes
Instructions:
1. Apply May 2020 Windows security updates. 2. For Windows 10: KB4556799. 3. For Windows Server 2016/2019: corresponding security updates. 4. Restart system after installation.
🔧 Temporary Workarounds
Restrict local user privileges
windowsLimit local user accounts to prevent execution of unauthorized applications
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local execution
- Monitor for suspicious local process execution and memory access patterns
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for May 2020 security updates or verify StartTileData.dll versionCheck Version:
wmic qfe list | findstr "KB4556799" or systeminfo | findstr "KB"Verify Fix Applied:
Verify May 2020 security updates are installed via Windows Update or check system version📡 Detection & Monitoring
Log Indicators:
- Unusual process creation events, suspicious DLL loading patterns
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
Process creation events with unusual parent-child relationships or DLL loading from non-standard locations