CVE-2021-32089
📋 TL;DR
CVE-2021-32089 allows unauthenticated attackers to upload arbitrary files to Zebra FX9500 RFID Reader filesystems, which can then be accessed via the web interface. This can lead to information disclosure and remote code execution. Only affects FX9500 devices that are no longer supported by the vendor.
💻 Affected Systems
- Zebra (formerly Motorola Solutions) Fixed RFID Reader FX9500
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via remote code execution, allowing attacker to control the RFID reader, steal sensitive RFID data, and pivot to other network systems.
Likely Case
Information disclosure of sensitive configuration files and potential malware deployment on vulnerable devices.
If Mitigated
Limited impact if devices are isolated from untrusted networks and have strict access controls.
🎯 Exploit Status
The vulnerability requires no authentication and has publicly available exploit details, making exploitation trivial for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://www.zebra.com/us/en/support-downloads/rfid/rfid-readers/fx9500.html
Restart Required: No
Instructions:
No official patch available. Zebra has ended support for FX9500 devices. Consider upgrading to supported hardware.
🔧 Temporary Workarounds
Network Isolation
linuxIsolate FX9500 devices from untrusted networks and restrict access to authorized IPs only.
Use firewall rules to restrict access: iptables -A INPUT -s [TRUSTED_IP] -p tcp --dport [WEB_PORT] -j ACCEPT
iptables -A INPUT -p tcp --dport [WEB_PORT] -j DROP
Disable Web Interface
allDisable the web interface if not required for operations.
Disable via device configuration if available
Block web port at firewall level
🧯 If You Can't Patch
- Replace with supported hardware (Zebra recommends upgrading to newer RFID readers)
- Implement strict network segmentation and zero-trust principles around these devices
🔍 How to Verify
Check if Vulnerable:
Check device model and support status. If it's an FX9500 RFID Reader, it is vulnerable as no patches exist.Check Version:
Check device web interface or serial console for model informationVerify Fix Applied:
No fix available to verify. Only mitigation through network controls or hardware replacement.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads via web interface
- Unauthenticated access attempts to upload endpoints
- Unexpected file creation in web-accessible directories
Network Indicators:
- HTTP POST requests to file upload endpoints from unauthorized sources
- Unusual outbound connections from RFID readers
SIEM Query:
source="fx9500" AND (http_method="POST" AND uri CONTAINS "upload") AND user="-"