CVE-2025-66715
📋 TL;DR
This DLL hijacking vulnerability in Axtion ODISSAAS ODIS v1.8.4 allows attackers to place a malicious DLL in a location where the application searches for legitimate DLLs, enabling arbitrary code execution. Organizations using this specific version of ODISSAAS ODIS are affected. The vulnerability requires local access or the ability to place files on the target system.
💻 Affected Systems
- Axtion ODISSAAS ODIS
📦 What is this software?
Odis by Axtion
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with administrative privileges, data theft, ransomware deployment, and lateral movement across the network.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive ODIS data and potential credential harvesting.
If Mitigated
Limited impact if proper file permissions and application whitelisting prevent DLL placement in vulnerable directories.
🎯 Exploit Status
DLL hijacking is a well-known technique with readily available tools. Exploitation requires the ability to place a DLL file in a specific directory accessible to the application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.axtion.nl/odis/
Restart Required: No
Instructions:
Check the vendor website for security updates. If a patch is released, download and install it according to vendor instructions.
🔧 Temporary Workarounds
Restrict DLL Search Path
windowsConfigure the application to use absolute paths for DLL loading or set the SafeDllSearchMode registry key to restrict DLL search order.
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager" /v SafeDllSearchMode /t REG_DWORD /d 1 /f
File System Permissions
windowsSet strict permissions on application directories to prevent unauthorized users from writing DLL files.
icacls "C:\Program Files\ODIS" /deny Everyone:(OI)(CI)(W)
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized DLLs.
- Monitor for suspicious DLL file creation in application directories using file integrity monitoring.
🔍 How to Verify
Check if Vulnerable:
Check if ODIS v1.8.4 is installed by examining the application version in the program files directory or via the vendor's update mechanism.Check Version:
Check the application executable properties or installation directory for version information.Verify Fix Applied:
Verify that the application no longer loads DLLs from untrusted directories by testing with a benign test DLL and monitoring DLL load events.📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing DLL load events from unusual locations (Event ID 7 in Sysmon)
- Application logs indicating unexpected DLL loading errors
Network Indicators:
- Unusual outbound connections from the ODIS process post-exploitation
SIEM Query:
EventID=7 AND (Image LIKE '%odis%' OR Image LIKE '%ODIS%') AND (ImageLoaded NOT LIKE '%system32%' AND ImageLoaded NOT LIKE '%program files%')