CVE-2021-33009
📋 TL;DR
CVE-2021-33009 allows unauthenticated remote attackers to upload arbitrary files to the mySCADA myPRO system file system. This affects mySCADA myPRO versions prior to 8.20.0, potentially enabling attackers to execute malicious code or disrupt operations.
💻 Affected Systems
- mySCADA myPRO
📦 What is this software?
Mypro by Myscada
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or operational disruption of industrial control systems.
Likely Case
Malicious file upload enabling backdoor installation, data manipulation, or denial of service attacks.
If Mitigated
Limited impact if network segmentation and access controls prevent unauthenticated access to vulnerable systems.
🎯 Exploit Status
Unauthenticated file upload vulnerability with straightforward exploitation path; weaponization likely given ICS/SCADA impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.20.0
Vendor Advisory: https://www.myscada.org/version-8-20-0-released-security-update
Restart Required: Yes
Instructions:
1. Download mySCADA myPRO version 8.20.0 or later from official vendor site. 2. Backup current configuration and data. 3. Install the update following vendor documentation. 4. Restart the myPRO service or system.
🔧 Temporary Workarounds
Network Segmentation
allIsolate myPRO systems from untrusted networks using firewalls or network segmentation.
Access Control Lists
allImplement strict network access controls to limit connections to myPRO systems.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems from untrusted networks.
- Deploy web application firewalls (WAF) or intrusion prevention systems (IPS) to block file upload attempts.
🔍 How to Verify
Check if Vulnerable:
Check myPRO version in administration interface or configuration files; versions below 8.20.0 are vulnerable.Check Version:
Check myPRO web interface or consult vendor documentation for version verification commands.Verify Fix Applied:
Confirm version is 8.20.0 or higher in administration interface or via version check command.📡 Detection & Monitoring
Log Indicators:
- Unusual file upload activity in myPRO logs
- Unauthenticated access attempts to file upload endpoints
Network Indicators:
- HTTP POST requests to file upload endpoints from unauthorized sources
- Unusual outbound connections after file upload
SIEM Query:
source="myPRO" AND (event="file_upload" OR uri="/upload") AND user="unauthenticated"