CVE-2023-35358
📋 TL;DR
This Windows kernel vulnerability allows attackers to gain elevated system privileges by exploiting improper memory handling. It affects Windows systems where an attacker already has local access. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
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 takeover with SYSTEM privileges, enabling installation of malware, data theft, and persistence mechanisms.
Likely Case
Local privilege escalation allowing attackers to bypass security controls and execute arbitrary code with higher privileges.
If Mitigated
Limited impact if proper patch management and least privilege principles are enforced, though local attackers could still escalate.
🎯 Exploit Status
Exploit requires local access and some technical knowledge; proof-of-concept code is publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2023 security updates (KB5028185 for Windows 10, KB5028182 for Windows 11, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35358
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Check for updates. 3. Install July 2023 security updates. 4. Restart the system when prompted.
🔧 Temporary Workarounds
Restrict local user privileges
windowsApply least privilege principles to limit local user accounts to only necessary permissions.
🧯 If You Can't Patch
- Implement strict access controls and monitor for suspicious local privilege escalation attempts.
- Use application whitelisting and endpoint detection to prevent unauthorized code execution.
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for July 2023 security updates or use 'systeminfo' command to verify OS build number.Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify that July 2023 security updates are installed via Windows Update history or 'wmic qfe list' command.📡 Detection & Monitoring
Log Indicators:
- Event ID 4688 (process creation) with suspicious parent-child privilege relationships
- Unexpected SYSTEM privilege processes from non-admin users
Network Indicators:
- Not applicable - local exploit only
SIEM Query:
EventID=4688 AND NewProcessName="*" AND SubjectUserName!="SYSTEM" AND TokenElevationType="%%1936"