CVE-2020-1250
📋 TL;DR
CVE-2020-1250 is a Windows kernel information disclosure vulnerability in the win32k component. An attacker with local access can run a specially crafted application to leak kernel memory information, which could help them escalate privileges or bypass security mechanisms. This affects Windows systems where an attacker has already gained initial access.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 7 by Microsoft
Windows 8.1 by Microsoft
Windows Rt 8.1 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Information disclosure could reveal kernel memory addresses or sensitive data, enabling privilege escalation or bypassing security controls like ASLR, leading to full system compromise.
Likely Case
Local attacker uses leaked kernel information to develop more reliable exploits for privilege escalation or to bypass security mitigations.
If Mitigated
With proper patching and security controls, the vulnerability is neutralized; information disclosure alone doesn't directly compromise systems without additional exploits.
🎯 Exploit Status
Exploitation requires local access and running a crafted application; no public proof-of-concept known as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply the security update from Microsoft's May 2020 Patch Tuesday or later
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1250
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Check for updates and install all available security updates. 3. Restart the system if prompted. For enterprise environments, deploy via WSUS or Microsoft Endpoint Configuration Manager.
🔧 Temporary Workarounds
Restrict local user privileges
windowsLimit users to standard accounts to reduce the ability to run arbitrary applications.
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local logins.
- Use application whitelisting to block execution of untrusted applications.
🔍 How to Verify
Check if Vulnerable:
Check if the May 2020 or later Windows security update is installed via 'wmic qfe list' or 'systeminfo' command.Check Version:
wmic os get versionVerify Fix Applied:
Verify the update is applied by checking the installed updates list in Windows Update history or using 'Get-Hotfix -Id KB4551853' (specific KB may vary).📡 Detection & Monitoring
Log Indicators:
- Unusual process creation events for win32k-related processes
- Security logs showing local privilege escalation attempts
Network Indicators:
- Not applicable as this is a local exploit
SIEM Query:
EventID=4688 AND (ProcessName LIKE '%win32k%' OR CommandLine CONTAINS 'win32k')