CVE-2022-30308 – CVE-2022-30308 allows unauthenticated attackers... (How to Fix)

Q: What is the severity of CVE-2022-30308?

CVE-2022-30308 has a CVSS score of 9.8 (CRITICAL). CVE-2022-30308 allows unauthenticated attackers to execute arbitrary system commands with root privileges on Festo CECC-X-M1 controllers via command injection in a specific HTTP endpoint. This affects all organizations using vulnerable versions of these industrial controllers. The vulnerability requires no authentication and provides complete system control.

📋 TL;DR

CVE-2022-30308 allows unauthenticated attackers to execute arbitrary system commands with root privileges on Festo CECC-X-M1 controllers via command injection in a specific HTTP endpoint. This affects all organizations using vulnerable versions of these industrial controllers. The vulnerability requires no authentication and provides complete system control.

💻 Affected Systems

Products:

Festo Controller CECC-X-M1 product family

Versions: Multiple versions (specific versions not detailed in provided references)

Operating Systems: Embedded Linux-based controller OS

Default Config Vulnerable: ⚠️ Yes

Notes: All default installations with web interface enabled are vulnerable. The vulnerability exists in the cecc-x-web-viewer-request-on endpoint.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete compromise of industrial control system allowing attackers to modify control logic, disrupt operations, steal sensitive data, or cause physical damage to equipment.

🟠

Likely Case

Unauthorized access to controller with ability to read/write configuration, disrupt operations, or use as pivot point into industrial network.

🟢

If Mitigated

Limited impact if controllers are isolated in segmented networks with strict firewall rules blocking external access.

🌐 Internet-Facing: HIGH - Controllers exposed to internet can be directly exploited without authentication.

🏢 Internal Only: HIGH - Even internally, any compromised device or malicious insider can exploit this vulnerability.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires sending a crafted POST request to the vulnerable endpoint. No authentication needed. Weaponization is likely due to high impact and low complexity.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Check Festo security advisory for specific patched versions

Vendor Advisory: https://cert.vde.com/en/advisories/VDE-2022-020/

Restart Required: Yes

Instructions:

1. Check current controller firmware version. 2. Download latest firmware from Festo support portal. 3. Follow Festo's firmware update procedure for CECC-X-M1 controllers. 4. Verify update completed successfully. 5. Restart controller.

🔧 Temporary Workarounds

Network Segmentation

all

Isolate controllers in dedicated network segments with strict firewall rules

Disable Web Interface

all

Disable HTTP/HTTPS services if not required for operations

🧯 If You Can't Patch

Implement strict network access controls allowing only trusted IPs to communicate with controllers
Deploy intrusion detection systems monitoring for suspicious HTTP requests to controller endpoints

🔍 How to Verify

Check if Vulnerable:

Check if controller responds to POST requests at /cecc-x-web-viewer-request-on endpoint and test with safe payloads if authorized

Check Version:

Check via web interface or Festo configuration tools for firmware version

Verify Fix Applied:

Verify firmware version matches patched version from Festo advisory and test endpoint no longer accepts malicious payloads

📡 Detection & Monitoring

Log Indicators:

Unusual POST requests to cecc-x-web-viewer-request-on endpoint
System command execution logs from web service user

Network Indicators:

HTTP POST requests to controller on unusual ports
Unexpected outbound connections from controller

SIEM Query:

source="controller_logs" AND (uri="/cecc-x-web-viewer-request-on" OR process="web_service" AND cmd="*sh*")

📊 Metadata

CVE ID: CVE-2022-30308

CVSS v3 Score: 9.8 (CRITICAL)

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

CWE: CWE-78

Published: June 13, 2022

Last Updated: November 21, 2024

🔗 References

https://cert.vde.com/en/advisories/VDE-2022-020/ Third Party Advisory
https://cert.vde.com/en/advisories/VDE-2022-020/ Third Party Advisory

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