CVE-2021-32955
📋 TL;DR
Delta Electronics DIAEnergie versions 1.7.5 and earlier contain an unrestricted file upload vulnerability that allows attackers to upload malicious files without proper validation. This can lead to remote code execution on affected systems, potentially compromising industrial control environments. Organizations using DIAEnergie for energy management in industrial settings are affected.
💻 Affected Systems
- Delta Electronics DIAEnergie
📦 What is this software?
Diaenergie by Deltaww
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary code, disrupt industrial operations, steal sensitive data, and pivot to other network systems.
Likely Case
Attackers upload web shells or malicious scripts to gain persistent access, execute commands, and potentially disrupt industrial processes.
If Mitigated
With proper network segmentation and access controls, impact limited to isolated system with no critical process disruption.
🎯 Exploit Status
Unrestricted file upload vulnerabilities are commonly exploited and weaponized due to their simplicity and high impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.8.0 or later
Vendor Advisory: https://www.deltaww.com/en-US/Service/SecurityAdvisory/Detail/1
Restart Required: Yes
Instructions:
1. Download DIAEnergie version 1.8.0 or later from Delta Electronics support portal. 2. Backup current configuration and data. 3. Install the updated version following vendor instructions. 4. Restart the DIAEnergie service or system.
🔧 Temporary Workarounds
Network Segmentation
allIsolate DIAEnergie systems from internet and restrict internal network access
Web Application Firewall
allDeploy WAF with file upload filtering rules to block malicious uploads
🧯 If You Can't Patch
- Implement strict network access controls to limit connections to DIAEnergie systems
- Deploy file integrity monitoring and endpoint detection on affected systems
🔍 How to Verify
Check if Vulnerable:
Check DIAEnergie version in application interface or installation directory. Versions 1.7.5 or earlier are vulnerable.Check Version:
Check Help > About in DIAEnergie interface or examine installation filesVerify Fix Applied:
Verify installation of version 1.8.0 or later and test file upload functionality with restricted file types.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to DIAEnergie web interface
- Execution of unexpected processes from web directory
- Web shell or malicious script creation in upload directories
Network Indicators:
- HTTP POST requests with file uploads to DIAEnergie endpoints
- Outbound connections from DIAEnergie system to unknown IPs
SIEM Query:
source="DIAEnergie" AND (event="file_upload" OR event="file_write") AND file_extension IN ("php", "asp", "jsp", "exe", "bat")