CVE-2023-23407
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Windows systems by sending specially crafted PPPoE packets. It affects Windows systems with PPPoE enabled, primarily impacting systems using broadband connections or VPNs that rely on PPPoE.
💻 Affected Systems
- Windows 10
- Windows 11
- Windows Server 2016
- 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
Full system compromise with administrative privileges, allowing attacker to install malware, steal data, or pivot to other systems.
Likely Case
System compromise leading to data theft, ransomware deployment, or creation of persistent backdoor access.
If Mitigated
Limited impact due to network segmentation and proper patching, potentially only affecting isolated systems.
🎯 Exploit Status
Exploitation requires network access to PPPoE interface and knowledge of PPPoE protocol manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: March 2023 security updates (KB5023696, KB5023697, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23407
Restart Required: Yes
Instructions:
1. Apply March 2023 Windows security updates via Windows Update. 2. For enterprise: Deploy updates through WSUS or SCCM. 3. Restart affected systems after patching.
🔧 Temporary Workarounds
Disable PPPoE
windowsDisable PPPoE protocol if not required for network connectivity
netsh interface set interface "PPPoE Connection" admin=disable
Network Segmentation
allIsolate systems using PPPoE from untrusted networks
🧯 If You Can't Patch
- Implement strict network segmentation to isolate PPPoE-enabled systems
- Deploy network-based intrusion prevention systems to detect and block malicious PPPoE traffic
🔍 How to Verify
Check if Vulnerable:
Check Windows version and installed updates. Systems without March 2023 security updates are vulnerable if PPPoE is enabled.Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify March 2023 security updates are installed via 'systeminfo' command or Windows Update history.📡 Detection & Monitoring
Log Indicators:
- Unusual PPPoE connection attempts
- System crashes related to raspppoe.sys
- Unexpected network interface changes
Network Indicators:
- Malformed PPPoE packets
- PPPoE traffic from unexpected sources
- Protocol anomalies in PPPoE sessions
SIEM Query:
EventID=1000 OR EventID=1001 AND SourceName="RasPPPoE" OR ProcessName="raspppoe.sys"