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ID

VDE-2023-006

Published

2023-06-25 08:00 (CEST)

Last update

2024-07-08 10:12 (CEST)

Vendor(s)

WAGO GmbH & Co. KG

Summary

An authenticated attacker can send a malformed packet to trigger a device crash via the CODESYS V2 runtime commands parsing.

Update: 08.07.2024 release date of the updates has been changed.

Vulnerabilities



Last Update
30. August 2024 09:28
Weakness
Improper Input Validation (CWE-20)
Summary

Multiple WAGO devices in multiple versions may allow an authenticated remote attacker with high privileges to DoS the device by sending a malformed packet.

Last Update
30. August 2024 09:28
Weakness
Improper Input Validation (CWE-20)
Summary

Multiple WAGO devices in multiple versions may allow an authenticated remote attacker with high privileges to DoS the device by sending a specifically crafted packet to the CODESYS V2 runtime.

Impact

Abusing these vulnerabilities an attacker can crash an affected product, which fully prevents the product to work as intended. After a complete restart the component works as expected.

Solution

Mitigation

If the PLC runtime is running, but you do not need it, you can deactivate the plc runtime programming port over the product settings in the web-based management. You can find this option under “Configuration > PLC Runtime Services > CODESYS 2 > communication enabled”.

As general security measures strongly WAGO recommends:

  1. Use general security best practices to protect systems from local and network attacks.
  2. Do not allow direct access to the device from untrusted networks.
  3. Update to the latest firmware according to the table in chapter solutions.
  4. Industrial control systems (ICS) should not be directly accessible from the Internet, but should be protected by consistently applying the defense-in-depth strategy.

The BSI provides general information on securing ICS in the ICS Compendium (https://www.bsi.bund.de/SharedDocs/Downloads/EN/BSI/ICS/ICS-Security_compendium.pdf).

Remediation

We recommend all effected users to update to the firmware version listed below:

Order No. Firmware Version
PFC200 Family
750-8202/xxx-xxx FW 22 Patch 2
750-8203/xxx-xxx
750-8204/xxx-xxx
750-8206/xxx-xxx
750-8207/xxx-xxx
750-8208/xxx-xxx
750-8210/xxx-xxx
750-8211/xxx-xxx
750-8212/xxx-xxx
750-8213/xxx-xxx
750-8214/xxx-xxx
750-8216/xxx-xxx
750-8217/xxx-xxx
Ethernet Controller 4th Generation family
750-823 FW 11 
750-332
750-832/xxx-xxx
750-862
750-890/xxx-xxx
750-891
750-893
Ethernet Controller 3rd Generation family
750-331 FW 17 (after BACnet certification)
750-829
750-831/xxx-xxx
750-852 FW 17 (already available)
750-880/xxx-xxx
750-881
750-882
750-885/xxx-xxx
750-889

Reported by

The vulnerability was reported by Daniel dos Santos and Abdelrahman Hassanien from Forescout.

Coordination done by CERT@VDE.