CVE-2020-12513
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary operating system commands on Pepperl+Fuchs Comtrol IO-Link Master devices. Attackers with valid credentials can inject malicious commands through the web interface, potentially gaining full control of affected devices. Organizations using these industrial control systems in manufacturing or industrial environments are at risk.
💻 Affected Systems
- Pepperl+Fuchs Comtrol IO-Link Master
📦 What is this software?
Io Link Master 4 Eip Firmware by Pepperl Fuchs
Io Link Master 4 Pnio Firmware by Pepperl Fuchs
Io Link Master 8 Eip Firmware by Pepperl Fuchs
Io Link Master 8 Eip L Firmware by Pepperl Fuchs
Io Link Master 8 Pnio Firmware by Pepperl Fuchs
Io Link Master 8 Pnio L Firmware by Pepperl Fuchs
Io Link Master Dr 8 Eip Firmware by Pepperl Fuchs
Io Link Master Dr 8 Eip P Firmware by Pepperl Fuchs
View all CVEs affecting Io Link Master Dr 8 Eip P Firmware →
Io Link Master Dr 8 Eip T Firmware by Pepperl Fuchs
View all CVEs affecting Io Link Master Dr 8 Eip T Firmware →
Io Link Master Dr 8 Pnio Firmware by Pepperl Fuchs
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the IO-Link Master device, allowing attackers to disrupt industrial processes, manipulate sensor/actuator data, pivot to other industrial systems, or cause physical damage to connected equipment.
Likely Case
Attackers with legitimate credentials (or stolen credentials) gain shell access to the device, enabling them to install backdoors, exfiltrate configuration data, or disrupt specific industrial operations.
If Mitigated
With proper network segmentation and credential protection, impact is limited to the specific IO-Link Master device, though lateral movement to other systems remains possible if the device is compromised.
🎯 Exploit Status
Exploitation requires valid credentials but command injection is straightforward once authenticated. No public exploit code has been released.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.5.49 or later
Vendor Advisory: https://cert.vde.com/en-us/advisories/vde-2020-038
Restart Required: Yes
Instructions:
1. Download firmware version 1.5.49 or later from Pepperl+Fuchs support portal. 2. Backup current configuration. 3. Upload new firmware via web interface. 4. Restart device. 5. Verify firmware version.
🔧 Temporary Workarounds
Network Segmentation
allIsolate IO-Link Master devices in separate network segments with strict firewall rules
Credential Hardening
allChange default credentials, implement strong password policies, and use unique credentials per device
🧯 If You Can't Patch
- Implement strict network access controls to limit which systems can communicate with IO-Link Master devices
- Monitor authentication logs for suspicious login attempts and implement account lockout policies
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface: Login > System > Firmware Information. If version is 1.5.48 or below, device is vulnerable.Check Version:
No CLI command available. Must check via web interface at System > Firmware Information.Verify Fix Applied:
After patching, verify firmware version shows 1.5.49 or later in the web interface.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Multiple failed login attempts followed by successful authentication
- Unexpected system processes or services
Network Indicators:
- Unusual outbound connections from IO-Link Master devices
- Traffic patterns inconsistent with normal industrial protocols
SIEM Query:
source="io-link-master-logs" AND (event_type="authentication" AND result="success") FOLLOWED BY event_type="system_command" WITHIN 5m