CVE-2024-38242
📋 TL;DR
This vulnerability allows attackers to gain elevated privileges on Windows systems by exploiting a heap-based buffer overflow in the Kernel Streaming Service Driver. It affects Windows systems where an authenticated attacker can execute code locally. The vulnerability enables privilege escalation from a lower-privileged account to SYSTEM level.
💻 Affected Systems
- Windows
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 21h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 24h2 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 enabling attackers to bypass security controls, install additional payloads, and maintain persistence on compromised systems.
If Mitigated
Limited impact if proper access controls, least privilege principles, and endpoint protection are in place to detect and block exploitation attempts.
🎯 Exploit Status
Requires authenticated access and local code execution. Exploitation involves triggering a heap-based buffer overflow (CWE-122).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2024 security updates (KB5040442 for Windows 10, KB5040437 for Windows 11, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38242
Restart Required: Yes
Instructions:
1. Apply July 2024 Windows security updates via Windows Update. 2. For enterprise environments, deploy updates through WSUS or Microsoft Endpoint Configuration Manager. 3. Restart systems after patch installation.
🔧 Temporary Workarounds
Disable Kernel Streaming Service Driver
windowsDisable the vulnerable driver component if not required for system functionality.
sc config ks.sys start= disabled
sc stop ks.sys
🧯 If You Can't Patch
- Implement strict access controls and least privilege principles to limit local user privileges.
- Deploy endpoint detection and response (EDR) solutions to monitor for privilege escalation attempts.
🔍 How to Verify
Check if Vulnerable:
Check if system is running affected Windows versions without July 2024 security updates installed.Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify July 2024 security updates (KB5040442, KB5040437, or equivalent) are installed via 'winver' or 'systeminfo' command.📡 Detection & Monitoring
Log Indicators:
- Event ID 4688 with suspicious process creation from low-privilege accounts
- Driver load events for ks.sys with unusual parent processes
Network Indicators:
- Not applicable - local privilege escalation vulnerability
SIEM Query:
EventID=4688 AND (NewProcessName="*\cmd.exe" OR NewProcessName="*\powershell.exe") AND SubjectUserName="*" AND NOT SubjectUserName="SYSTEM" AND NOT SubjectUserName="LOCAL SERVICE" AND NOT SubjectUserName="NETWORK SERVICE"