CVE-2025-1066
📋 TL;DR
OpenPLC_V3 contains an arbitrary file upload vulnerability that allows attackers to upload malicious files to the server. This could enable remote code execution, malware deployment, or phishing campaigns. Any organization using vulnerable versions of OpenPLC_V3 is affected.
💻 Affected Systems
- OpenPLC_V3
⚠️ 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
Complete system compromise leading to ransomware deployment, data exfiltration, or disruption of industrial control processes
Likely Case
Malware installation for persistence, credential theft, or use as phishing/malvertising platform
If Mitigated
Limited impact if proper file upload validation and access controls are implemented
🎯 Exploit Status
Exploit details published in Medium article; simple file upload bypass techniques
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit d1b1a3b7e97f2b3fef0876056cf9d7879991744a or later
Vendor Advisory: https://github.com/thiagoralves/OpenPLC_v3/commit/d1b1a3b7e97f2b3fef0876056cf9d7879991744a
Restart Required: Yes
Instructions:
1. Pull latest OpenPLC_V3 from GitHub. 2. Apply commit d1b1a3b7e97f2b3fef0876056cf9d7879991744a. 3. Restart OpenPLC service.
🔧 Temporary Workarounds
Disable file upload functionality
allTemporarily disable file upload endpoints if not required
Modify OpenPLC configuration to remove/disable upload handlers
Implement file type validation
allAdd server-side validation to restrict allowed file types
Add file extension and MIME type validation to upload handlers
🧯 If You Can't Patch
- Implement strict network segmentation to isolate OpenPLC systems
- Deploy web application firewall with file upload protection rules
🔍 How to Verify
Check if Vulnerable:
Check if OpenPLC version predates commit d1b1a3b7e97f2b3fef0876056cf9d7879991744aCheck Version:
git log --oneline | head -5Verify Fix Applied:
Verify commit d1b1a3b7e97f2b3fef0876056cf9d7879991744a is applied and test file upload with malicious extensions📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with executable extensions
- Multiple failed upload attempts
- Uploads from unexpected IP addresses
Network Indicators:
- HTTP POST requests to upload endpoints with suspicious file names
- Outbound connections from OpenPLC server to unknown destinations
SIEM Query:
source="openplc.log" AND ("upload" OR "POST") AND ("exe" OR "php" OR "jsp" OR "sh")