| Article No° | Product Name | Affected Version(s) |
|---|---|---|
| 750-81xx/xxx-xxx (PFC100) | >= FW11 | |
| 750-82xx/xxx-xxx (PFC200) | >= FW11 | |
| 762-4xxx | >= FW11 | |
| 762-5xxx | >= FW11 | |
| 762-6xxx | >= FW11 |
The Cloud Connectivity of the WAGO PLCs is used to connect the device with the cloud services from different providers. It also supports maintenance functionality with the firmware update function from the WAGO cloud.
An attacker needs an authorized login with administrative privileges on the device in order to exploit the mentioned vulnerabilities.
An exploitable improper host validation vulnerability exists in the Cloud Connectivity functionality of WAGO PFC200 Firmware versions 03.02.02(14), 03.01.07(13), and 03.00.39(12). A specially crafted HTTPS POST request can cause the software to connect to an unauthorized host, resulting in unauthorized access to firmware update functionality. An attacker can send an authenticated HTTPS POST request to direct the Cloud Connectivity software to connect to an attacker controlled Azure IoT Hub node.
An exploitable command injection vulnerability exists in the cloud connectivity functionality of WAGO PFC200 versions 03.02.02(14), 03.01.07(13), and 03.00.39(12). An attacker can inject operating system commands into the TimeoutPrepared parameter value contained in the firmware update command.
An exploitable command injection vulnerability exists in the Cloud Connectivity functionality of WAGO PFC200 Firmware versions 03.02.02(14), 03.01.07(13), and 03.00.39(12). An attacker can inject OS commands into the TimeoutUnconfirmed parameter value contained in the Firmware Update command.
An exploitable command injection vulnerability exists in the cloud connectivity feature of WAGO PFC200. An attacker can inject operating system commands into any of the parameter values contained in the firmware update command. This affects WAGO PFC200 Firmware version 03.02.02(14), version 03.01.07(13), and version 03.00.39(12)
These vulnerabilities allow an attacker which has admin privileges, an Azure cloud account and access to the device to redirect the cloud connection. With thus he is able to get sensitive data.
Mitigation
Follow the instructions in WAGOs handbook Cyber Security for Controller
Restrict network access to the device.
Do not directly connect the device to the internet
Solution
Use strong passwords for all user accounts, especially for administrative user accounts on the device.
These vulnerabilities were reported by Kelly Leuschner of Cisco Talos to WAGO.
Coordination done by CERT@VDE.