CVE-2021-32947
📋 TL;DR
CVE-2021-32947 is a stack-based buffer overflow vulnerability in FATEK Automation FvDesigner software that allows attackers to execute arbitrary code on affected systems. This affects users of FvDesigner versions 1.5.88 and earlier who process malicious project files. The vulnerability could lead to complete system compromise.
💻 Affected Systems
- FATEK Automation FvDesigner
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with administrative privileges, allowing installation of persistent malware, data theft, and lateral movement within the network.
Likely Case
Remote code execution leading to system compromise, data exfiltration, and potential ransomware deployment on affected engineering workstations.
If Mitigated
Limited impact with proper network segmentation and application whitelisting preventing successful exploitation.
🎯 Exploit Status
Exploitation requires user interaction to open malicious project files. Proof-of-concept code is publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.5.89 or later
Vendor Advisory: https://us-cert.cisa.gov/ics/advisories/icsa-21-217-02
Restart Required: Yes
Instructions:
1. Download FvDesigner version 1.5.89 or later from FATEK Automation website. 2. Uninstall previous version. 3. Install updated version. 4. Restart system.
🔧 Temporary Workarounds
Restrict project file execution
windowsBlock execution of .fpj files or restrict to trusted sources only
Use Windows Group Policy to restrict .fpj file execution
Configure application whitelisting to only allow signed FvDesigner executables
Network segmentation
allIsolate engineering workstations from critical networks
Implement VLAN segmentation for engineering workstations
Configure firewall rules to restrict engineering workstation network access
🧯 If You Can't Patch
- Implement strict application whitelisting to prevent unauthorized code execution
- Isolate affected systems in a segmented network with limited access to critical assets
🔍 How to Verify
Check if Vulnerable:
Check FvDesigner version in Help > About menu. If version is 1.5.88 or earlier, system is vulnerable.Check Version:
Check FvDesigner.exe properties or use 'wmic product where name="FvDesigner" get version' in command promptVerify Fix Applied:
Verify FvDesigner version is 1.5.89 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing FvDesigner crashes
- Application logs showing abnormal .fpj file processing
- Antivirus alerts for suspicious FvDesigner behavior
Network Indicators:
- Unusual outbound connections from engineering workstations
- Traffic to known malicious IPs from FvDesigner systems
SIEM Query:
source="windows" AND (event_id=1000 OR event_id=1001) AND process_name="FvDesigner.exe"