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ID

VDE-2022-060

Published

2023-02-27 12:00 (CET)

Last update

2023-02-27 15:35 (CET)

Vendor(s)

WAGO GmbH & Co. KG

Product(s)

Article No┬░ Product Name Affected Version(s)
751-9301 Compact Controller CC100 FW16 <= FW22
751-9301 Compact Controller CC100 = FW23
752-8303/8000-002 Edge Controller = FW23
752-8303/8000-002 Edge Controller FW18 <= FW22
750-81xx/xxx-xxx PFC100 FW16 <= FW22
750-81xx/xxx-xxx PFC100 = FW23
750-82xx/xxx-xxx PFC200 FW16 <= FW22
750-82xx/xxx-xxx PFC200 = FW23
762-5xxx Touch Panel 600 Advanced Line FW16 <= FW22
762-5xxx Touch Panel 600 Advanced Line = FW23
762-6xxx Touch Panel 600 Marine Line FW16 <= FW22
762-6xxx Touch Panel 600 Marine Line = FW23
762-4xxx Touch Panel 600 Standard Line FW16 <= FW22
762-4xxx Touch Panel 600 Standard Line = FW23

Summary

The Web-Based Management (WBM) of WAGOs programmable logic controller (PLC) is typically used for administration, commissioning and updates.

The configuration backend can in some cases be used without authentication and to write data with root privileges. Additionally, the web-based management suffers a CORS misconfiguration and allows reflected XSS (Cross-Site Scripting) attacks.

Vulnerabilities



Last Update
Feb. 13, 2023, 4:24 p.m.
Weakness
Missing Authentication for Critical Function (CWE-306)
Summary

The configuration backend of the web-based management can be used by unauthenticated users, although only authenticated users should be able to use the API. The vulnerability allows an unauthenticated attacker to read and set several device parameters that can lead to full compromise of the device.

Last Update
Feb. 13, 2023, 4:25 p.m.
Weakness
Missing Authentication for Critical Function (CWE-306)
Summary

The configuration backend allows an unauthenticated user to write arbitrary data with root privileges to the storage, which could lead to unauthenticated remote code execution and full system compromise.

Last Update
Feb. 13, 2023, 4:24 p.m.
Weakness
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CWE-79)
Summary

The configuration backend of the web-based management is vulnerable to reflected XSS (Cross-Site Scripting) attacks that targets the users browser. This leads to a limited impact of confidentiality and integrity but no impact of availability.

Last Update
Feb. 13, 2023, 4:24 p.m.
Weakness
Origin Validation Error (CWE-346)
Summary

A CORS Misconfiguration in the web-based management allows a malicious third party webserver to misuse all basic information pages on the webserver. In combination with CVE-2022-45138 this could lead to disclosure of device information like CPU diagnostics. As there is just a limited amount of information readable the impact only affects a small subset of confidentiality.

Impact

The web-based management of affected products is vulnerable to Reflective Cross-Site Scripting. This can be used to install malicious code and to gain access to confidential information on a System that connects to the WBM after it has been compromised.

Additionally, the web-based management of affected products is vulnerable to stealing and setting device parameters and remote code execution by an unauthenticated attacker.

Solution

Mitigation

  • If not needed, you can deactivate the web-based management to prevent attacks (command line)
  • Restrict network access to the device.
  • Do not directly connect the device to the internet

Remediation

We recommend all users of affected products to install FW22 Patch 1 or FW 24 or higher.

Reported by

These vulnerabilities were reported to WAGO by Ryan Pickren from Georgia Institute of Technology's Cyber-Physical Security Lab
Coordination done by CERT@VDE.