CVE-2023-23392
📋 TL;DR
CVE-2023-23392 is a critical remote code execution vulnerability in the Windows HTTP Protocol Stack (http.sys) that allows unauthenticated attackers to execute arbitrary code with SYSTEM privileges by sending specially crafted packets. This affects Windows servers and workstations running vulnerable versions of the HTTP stack. The vulnerability is wormable and can be exploited without user interaction.
💻 Affected Systems
- Windows Server
- Windows Client
📦 What is this software?
Windows 11 21h2 by Microsoft
Windows 11 22h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM privileges leading to ransomware deployment, data exfiltration, or persistent backdoor installation across the network.
Likely Case
Attackers gain full control over vulnerable systems to install malware, steal credentials, and pivot to other network resources.
If Mitigated
Limited impact due to network segmentation, strict firewall rules, and immediate patching preventing exploitation attempts.
🎯 Exploit Status
Exploitation is reliable and does not require authentication. Multiple proof-of-concept exploits are publicly available, and Microsoft has confirmed active exploitation in the wild.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: March 2023 Security Updates (KB5023705, KB5023697, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23392
Restart Required: Yes
Instructions:
1. Apply March 2023 Windows Security Updates from Windows Update or Microsoft Update Catalog. 2. Restart affected systems. 3. Verify patch installation via winver or systeminfo command.
🔧 Temporary Workarounds
Disable HTTP Protocol Stack
windowsDisables the vulnerable http.sys component but may break web services and applications relying on it.
Disable-WindowsOptionalFeature -Online -FeatureName IIS-HttpProtocol -NoRestart
Block TCP Port 80/443 at Perimeter
allPrevents external exploitation by blocking HTTP/HTTPS traffic to vulnerable systems.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems from critical assets
- Deploy intrusion prevention systems (IPS) with signatures for CVE-2023-23392 exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Windows version and patch level via 'systeminfo' command. Vulnerable if running affected versions without March 2023 security updates.Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify March 2023 security updates are installed via 'wmic qfe list' or check Windows Update history for KB5023705/KB5023697.📡 Detection & Monitoring
Log Indicators:
- Event ID 4625 (failed logon) from SYSTEM account
- Unexpected HTTP.sys crashes in System logs
- New services or scheduled tasks created by SYSTEM
Network Indicators:
- Malformed HTTP packets to port 80/443
- Unusual outbound connections from web servers
- Exploit kit traffic patterns
SIEM Query:
source="windows" event_id=4625 user="SYSTEM" | stats count by src_ip dest_ip