CVE-2023-24864
📋 TL;DR
This vulnerability allows attackers to exploit Microsoft PostScript and PCL6 Class Printer Drivers to gain SYSTEM-level privileges on Windows systems. It affects Windows servers and workstations where these printer drivers are installed. Successful exploitation requires local access to the target system.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 20h2 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 21h2 by Microsoft
Windows 11 22h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could execute arbitrary code with SYSTEM privileges, enabling complete system compromise, persistence, lateral movement, and data exfiltration.
Likely Case
Malicious insiders or attackers who have gained initial foothold could escalate privileges to SYSTEM, bypassing security controls and accessing sensitive resources.
If Mitigated
With proper patch management and least privilege principles, impact is limited to systems where attackers already have local access but cannot escalate beyond their current privileges.
🎯 Exploit Status
Requires local access and specific conditions to trigger the privilege escalation. No public exploit code was available at the time of disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security updates released in March 2023 Patch Tuesday
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-24864
Restart Required: Yes
Instructions:
1. Apply March 2023 Windows security updates via Windows Update. 2. For enterprise environments, deploy through WSUS or Microsoft Endpoint Configuration Manager. 3. Restart affected systems after patch installation.
🔧 Temporary Workarounds
Disable vulnerable printer drivers
windowsRemove or disable PostScript and PCL6 Class Printer Drivers if not required for business operations
Remove via Control Panel > Devices and Printers > Right-click printer > Remove device
Or use PowerShell: Remove-Printer -Name "PrinterName"
Restrict printer driver installation
windowsConfigure Group Policy to restrict printer driver installation to administrators only
gpedit.msc > Computer Configuration > Administrative Templates > Printers > Point and Print Restrictions > Enable and configure restrictions
🧯 If You Can't Patch
- Implement strict least privilege principles to limit local user privileges
- Monitor for suspicious printer driver installation or modification activities
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for March 2023 security updates or run: wmic qfe list | findstr "KB5023696 KB5023697 KB5023702"Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify March 2023 security updates are installed via Settings > Update & Security > View update history📡 Detection & Monitoring
Log Indicators:
- Event ID 307 (Print spooler service events)
- Unexpected printer driver installation
- Process creation with SYSTEM privileges from print-related processes
Network Indicators:
- Unusual print server communications
- Lateral movement attempts following printer driver modifications
SIEM Query:
EventID=307 AND (ProcessName="spoolsv.exe" OR CommandLine CONTAINS "PostScript" OR CommandLine CONTAINS "PCL6")