CVE-2024-51364
📋 TL;DR
An arbitrary file upload vulnerability in ModbusMechanic v3.0 allows attackers to upload malicious .xml files that can lead to remote code execution. This affects all users running ModbusMechanic v3.0 who have the vulnerable file upload functionality exposed. Attackers can gain complete control of affected systems.
💻 Affected Systems
- ModbusMechanic
⚠️ 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
Full system compromise with attacker gaining root/administrator privileges, data exfiltration, ransomware deployment, and lateral movement within the network.
Likely Case
Remote code execution leading to system compromise, data theft, and potential use as a foothold for further attacks.
If Mitigated
Limited impact with proper network segmentation and file upload restrictions, potentially only affecting the application service.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub, making exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://modbusmechanic.com
Restart Required: No
Instructions:
No official patch available. Check vendor website for updates. Consider workarounds or alternative software.
🔧 Temporary Workarounds
Disable XML File Upload
allRemove or disable the vulnerable file upload functionality that accepts .xml files.
# Configuration dependent - modify application settings to disable XML upload
Web Application Firewall Rules
allImplement WAF rules to block .xml file uploads to ModbusMechanic endpoints.
# WAF specific - create rule to block POST requests with .xml files to /upload paths
🧯 If You Can't Patch
- Network segmentation: Isolate ModbusMechanic instances from critical systems and internet access.
- Implement strict file upload validation: Allow only specific file types and implement content verification.
🔍 How to Verify
Check if Vulnerable:
Check if ModbusMechanic v3.0 is installed and if the XML file upload functionality is accessible via HTTP requests.Check Version:
# Check application version in interface or configuration filesVerify Fix Applied:
Test if XML file uploads are properly blocked or validated. Attempt to upload a test XML file and verify it's rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual XML file uploads
- Large XML files being processed
- Unexpected process execution following file upload
Network Indicators:
- HTTP POST requests with .xml files to upload endpoints
- Unusual outbound connections from ModbusMechanic server
SIEM Query:
source="modbusmechanic.log" AND ("upload" AND ".xml") OR ("POST" AND "/upload" AND "Content-Type: text/xml")