CVE-2020-25244
📋 TL;DR
CVE-2020-25244 is a DLL hijacking vulnerability in Siemens LOGO! Soft Comfort software that allows local attackers to execute arbitrary code by placing malicious DLLs in directories searched by the application. This affects all versions before V8.4. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- Siemens LOGO! Soft Comfort
📦 What is this software?
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Local attacker gains SYSTEM/administrator privileges and full control of the host machine, enabling data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local user with limited privileges escalates to administrator rights, installs malware, or steals sensitive data from the compromised system.
If Mitigated
Attack fails due to proper file permissions, application whitelisting, or lack of local access to vulnerable directories.
🎯 Exploit Status
DLL hijacking is a well-known attack vector with established techniques. Exploitation requires local access to place malicious DLLs in writable directories searched by the application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V8.4 and later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-983300.pdf
Restart Required: Yes
Instructions:
1. Download LOGO! Soft Comfort V8.4 or later from Siemens official website. 2. Uninstall previous versions. 3. Install the updated version. 4. Restart the system.
🔧 Temporary Workarounds
Restrict directory permissions
windowsSet strict file permissions on directories where LOGO! Soft Comfort runs to prevent unauthorized DLL placement
icacls "C:\Program Files\Siemens\LOGO! Soft Comfort\" /deny Users:(OI)(CI)W
Application whitelisting
windowsUse Windows AppLocker or similar to restrict which DLLs can be loaded by LOGO! Soft Comfort
🧯 If You Can't Patch
- Restrict local access to systems running LOGO! Soft Comfort to trusted users only
- Monitor for suspicious DLL loading events using Windows Event Logs or EDR solutions
🔍 How to Verify
Check if Vulnerable:
Check LOGO! Soft Comfort version via Help > About in the application interfaceCheck Version:
Not applicable - version check is through GUI onlyVerify Fix Applied:
Confirm version is V8.4 or higher in Help > About menu📡 Detection & Monitoring
Log Indicators:
- Windows Event ID 4688 (process creation) showing LOGO! Soft Comfort loading DLLs from unusual locations
- Sysmon Event ID 7 (Image loaded) for suspicious DLL paths
Network Indicators:
- No network indicators - this is a local exploitation vulnerability
SIEM Query:
source="Windows Security" EventID=4688 ProcessName="*LOGO*" | search CommandLine="*.dll"