CVE-2023-23385
📋 TL;DR
This vulnerability allows an attacker to gain SYSTEM-level privileges on Windows systems by exploiting an integer overflow in the PPPoE driver. It affects Windows systems with PPPoE enabled, which is commonly used for DSL internet connections.
💻 Affected Systems
- Windows 10
- Windows 11
- Windows Server 2019
- Windows Server 2022
📦 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
Complete system compromise with SYSTEM privileges, allowing installation of malware, data theft, and persistence mechanisms.
Likely Case
Local privilege escalation from a standard user account to SYSTEM, enabling lateral movement and credential harvesting.
If Mitigated
Limited impact if proper network segmentation and least privilege principles are followed, though local compromise remains possible.
🎯 Exploit Status
Requires local access and user-level privileges to exploit. No public exploit code available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: March 2023 security updates (KB5023696 for Windows 10, KB5023705 for Windows 11, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23385
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Click 'Check for updates'. 3. Install March 2023 security updates. 4. Restart the system when prompted.
🔧 Temporary Workarounds
Disable PPPoE service
windowsDisables the vulnerable PPPoE driver if not needed for network connectivity
sc config RasMan start= disabled
sc stop RasMan
🧯 If You Can't Patch
- Implement strict network segmentation to limit lateral movement
- Enforce least privilege principles and monitor for privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check if PPPoE service is running and system has not installed March 2023 security updatesCheck Version:
winverVerify Fix Applied:
Verify March 2023 security updates are installed via 'winver' command or Windows Update history📡 Detection & Monitoring
Log Indicators:
- Event ID 4697: Service installation in Security logs
- Unexpected SYSTEM privilege processes
Network Indicators:
- Unusual PPPoE connection attempts from internal systems
SIEM Query:
EventID=4697 AND ServiceName="RasMan" OR ProcessName="svchost.exe" AND ParentProcessName="services.exe" AND CommandLine LIKE "%pppoe%"