CVE-2023-37243
📋 TL;DR
This vulnerability allows standard users to achieve privilege escalation to SYSTEM level through DLL hijacking. When the system reboots, a vulnerable executable in the Windows Temp folder runs with SYSTEM privileges, and users can place malicious DLLs in that folder due to inherited permissions. This affects Windows systems with the vulnerable component installed.
💻 Affected Systems
- Agent.Package.Availability component
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full SYSTEM privilege compromise leading to complete system takeover, persistence installation, credential theft, and lateral movement across the network.
Likely Case
Local privilege escalation from standard user to SYSTEM, enabling installation of malware, disabling security controls, and accessing protected system resources.
If Mitigated
Limited impact with proper access controls, monitoring, and least privilege principles in place.
🎯 Exploit Status
Exploitation requires standard user access and system reboot. The DLL hijacking technique is well-documented and easy to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No vendor advisory found in provided references
Restart Required: Yes
Instructions:
No official patch identified. Apply workarounds and monitor for vendor updates.
🔧 Temporary Workarounds
Restrict folder permissions
windowsModify permissions on C:\Windows\Temp\Agent.Package.Availability to prevent user write access
icacls "C:\Windows\Temp\Agent.Package.Availability" /inheritance:r
icacls "C:\Windows\Temp\Agent.Package.Availability" /grant SYSTEM:F
icacls "C:\Windows\Temp\Agent.Package.Availability" /grant Administrators:F
Remove vulnerable executable
windowsDelete or rename the vulnerable executable to prevent automatic execution
del "C:\Windows\Temp\Agent.Package.Availability\Agent.Package.Availability.exe"
ren "C:\Windows\Temp\Agent.Package.Availability\Agent.Package.Availability.exe" Agent.Package.Availability.exe.bak
🧯 If You Can't Patch
- Implement strict least privilege principles - limit standard user access to sensitive systems
- Enable auditing and monitoring for file creation/modification in C:\Windows\Temp\Agent.Package.Availability folder
🔍 How to Verify
Check if Vulnerable:
Check if C:\Windows\Temp\Agent.Package.Availability\Agent.Package.Availability.exe exists and if standard users have write permissions to the folder using: icacls "C:\Windows\Temp\Agent.Package.Availability"Check Version:
No specific version check command available for this componentVerify Fix Applied:
Verify standard users cannot write to the folder and the executable is removed or permissions are restricted📡 Detection & Monitoring
Log Indicators:
- File creation/modification events in C:\Windows\Temp\Agent.Package.Availability
- Process execution of Agent.Package.Availability.exe with SYSTEM privileges
- DLL loading from suspicious locations
Network Indicators:
- No specific network indicators - local privilege escalation
SIEM Query:
EventID=4688 OR EventID=4689 WHERE ProcessName='Agent.Package.Availability.exe' AND IntegrityLevel='System'