CVE-2020-12511 – This CSRF vulnerability in Pepperl+Fuchs Comtro... (How to Fix)

Q: What is the severity of CVE-2020-12511?

CVE-2020-12511 has a CVSS score of 8.8 (HIGH). This CSRF vulnerability in Pepperl+Fuchs Comtrol IO-Link Master web interface allows attackers to trick authenticated users into performing unauthorized actions. It affects all users of Version 1.5.48 and below who access the web interface. Attackers could modify device configurations without the user's knowledge.

📋 TL;DR

This CSRF vulnerability in Pepperl+Fuchs Comtrol IO-Link Master web interface allows attackers to trick authenticated users into performing unauthorized actions. It affects all users of Version 1.5.48 and below who access the web interface. Attackers could modify device configurations without the user's knowledge.

💻 Affected Systems

Products:

Pepperl+Fuchs Comtrol IO-Link Master

Versions: Version 1.5.48 and below

Operating Systems: Embedded/Device-specific OS

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability exists in default web interface configuration. Requires user to be authenticated to the web interface for exploitation.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete device takeover allowing attackers to reconfigure industrial control systems, disrupt operations, or create safety hazards in industrial environments.

🟠

Likely Case

Unauthorized configuration changes to IO-Link devices leading to operational disruption or data manipulation.

🟢

If Mitigated

Limited impact with proper network segmentation and CSRF protections in place.

🌐 Internet-Facing: HIGH - Web interface exposed to internet allows remote attackers to exploit without direct network access.

🏢 Internal Only: MEDIUM - Requires attacker to be on internal network or trick internal users, but industrial systems often have critical functions.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: LOW

CSRF attacks are generally low complexity but require the victim to be authenticated. No public exploit code identified in references.

🛠️ 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 update from Pepperl+Fuchs support portal. 2. Backup current configuration. 3. Apply firmware update via web interface or management tools. 4. Restart device. 5. Verify version is 1.5.49 or higher.

🔧 Temporary Workarounds

Network Segmentation

all

Isolate IO-Link Master devices from untrusted networks and user workstations.

Access Control Restrictions

all

Restrict web interface access to specific IP addresses or VLANs.

🧯 If You Can't Patch

Implement strict network segmentation to isolate devices from user networks
Use browser extensions that block CSRF attempts and educate users about phishing risks

🔍 How to Verify

Check if Vulnerable:

Check device firmware version via web interface or management software. If version is 1.5.48 or below, device is vulnerable.

Check Version:

Access web interface and navigate to System Information or use vendor-specific management tools to query version.

Verify Fix Applied:

After patching, verify firmware version shows 1.5.49 or higher in web interface or management console.

📡 Detection & Monitoring

Log Indicators:

Multiple configuration changes from different IP addresses in short timeframes
Unauthorized configuration modification attempts in audit logs

Network Indicators:

HTTP POST requests to configuration endpoints with unexpected referrer headers
Cross-origin requests to device web interface

SIEM Query:

source="io-link-master-logs" AND (event_type="config_change" AND src_ip!=expected_admin_ip)

📊 Metadata

CVE ID: CVE-2020-12511

CVSS v3 Score: 8.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE: CWE-352

Published: January 22, 2021

Last Updated: November 21, 2024

🔗 References

https://cert.vde.com/en-us/advisories/vde-2020-038 Third Party Advisory
https://cert.vde.com/en-us/advisories/vde-2020-038 Third Party Advisory

📤 Share & Export

📄 Export Markdown 📋 Export JSON

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