CVE-2023-35380
📋 TL;DR
This Windows kernel vulnerability allows an authenticated attacker to execute arbitrary code with elevated SYSTEM privileges. It affects Windows operating systems and requires local access to exploit. Attackers can gain complete control over affected systems.
💻 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 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 persistent backdoor installation, credential theft, lateral movement across network, and data exfiltration.
Likely Case
Local privilege escalation from standard user to SYSTEM, enabling malware persistence, disabling security controls, and accessing sensitive system resources.
If Mitigated
Limited impact with proper endpoint protection, least privilege enforcement, and network segmentation preventing lateral movement.
🎯 Exploit Status
Requires local authenticated access. CWE-416 indicates use-after-free vulnerability requiring specific memory manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft's July 2023 or later security updates for specific KB numbers
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35380
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates via Windows Update. 2. For enterprise: Deploy through WSUS or Microsoft Endpoint Configuration Manager. 3. Verify installation with 'wmic qfe list' or 'Get-Hotfix' in PowerShell.
🔧 Temporary Workarounds
Restrict local user privileges
windowsImplement least privilege principle to limit users who could exploit this vulnerability
Enable exploit protection
windowsUse Windows Defender Exploit Guard to mitigate exploitation attempts
Set-ProcessMitigation -System -Enable DEP,ASLR,CFG
🧯 If You Can't Patch
- Implement strict endpoint detection and response (EDR) to detect privilege escalation attempts
- Segment networks to limit lateral movement if exploitation occurs
🔍 How to Verify
Check if Vulnerable:
Check Windows build number against Microsoft's advisory. Use 'winver' command or 'Get-ComputerInfo | Select WindowsProductName, WindowsVersion' in PowerShell.Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify KB patch installation with 'Get-HotFix | Where-Object {$_.HotFixID -like "KB*"}' and compare with Microsoft's fixed versions.📡 Detection & Monitoring
Log Indicators:
- Windows Security Event ID 4688 (process creation) showing unusual parent-child relationships
- Sysmon Event ID 10 (ProcessAccess) with suspicious access patterns
- Unexpected SYSTEM privilege acquisition by user processes
Network Indicators:
- Not network exploitable - focus on host-based detection
SIEM Query:
EventID=4688 AND NewProcessName="*" AND ParentProcessName="*" | where privilege_escalation_patterns_detected