WAGO: Command Injection Vulnerability in I/O-Check Service

The reported vulnerability allows an attacker who has network access to the device to execute code with specially crafted packets.

VDE-2020-045 (2020-12-17 10:00 UTC+0100)

CVE Identifier

CVE-2020-12522

Affected Vendors

WAGO

Affected Products

  • Series PFC100 (750-81xx/xxx-xxx)
  • Series PFC200 (750-82xx/xxx-xxx)
  • Series Wago Touch Panel 600 Standard Line (762-4xxx)
  • Series Wago Touch Panel 600 Advanced Line (762-5xxx)
  • Series Wago Touch Panel 600 Marine Line (762-6xxx)


All FW versions <= FW10 are affected.

Summary

The reported vulnerability allows an attacker who has network access to the device to execute code with specially crafted packets.

Impact

By exploiting the described vulnerabilities the attacker potentially is able to manipulate or disrupt the device.

Solution

The I/O-Check service protocol is only needed during installation and commissioning, not during normal operations. It is highly recommended to disable the I/O-Check service after commissioning. This is the easiest and securest way to protect your device from the listed vulnerabilities.

Regardless to the action described above, the vulnerability has been fixed in FW11, released in December 2017.

Mitigation

  • Disable I/O-Check service
  • Restrict network access to the device.
  • Do not directly connect the device to the internet.

Reported by

This vulnerability was originally found by Florian Seidel of WAGO and was rediscovered by Uri Katz of Claroty. We thank CERT@VDE for the management of this coordinated disclosure.