PEPPERL+FUCHS: Security Advisory for PrintNightmare Vulnerability in multiple HMI Devices

A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

VDE-2021-034 (2021-07-30 09:55 UTC+0200)

CVE Identifier

CVE-2021-34527

Affected Vendors

PEPPERL+FUCHS

Affected Products

VisuNet RM*, VisuNet PC*, Box Thin Client BTC* (All products within these families)

Vulnerability Type

Improper Privilege Management (CWE-269) / Remote Code Execution

Summary

A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

See details on Microsoft Advisory CVE-2021-34527 (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527)

Impact

An attacker could install programs; view, change, or delete data; or create new accounts with full user rights.

Solution

Customers using Pepperl+Fuchs HMI devices out of VisuNet RM*, VisuNet PC* or Box Thin Client BTC* product families should follow these guidelines:

  • Pepperl+Fuchs HMI devices running RM Shell 5 should install “Security Patch PrintNightmare (18-34369)” to disable the “Allow Print Spooler to accept client connections:” group policy to block remote attacks: https://www.pepperl-fuchs.com/cgi-bin/db/doci.pl/?ShowDocByDocNo=18-34369
  • Pepperl+Fuchs HMI devices running a Windows 10 LTSB 2016 or Windows 10 LTSC 2019 should use the Windows Update functionality to update the system.
  • Customers using HMI devices based on Windows 7 or older should upgrade to a Windows 10 LTSB 2016 or Windows 10 LTSC 2019 Version.

Security updates

Please check the P+F website regularly for Windows security updates and use our security update service to be informed about the latest security incidents.

We will inform you as soon as Microsoft releases further security updates and measures for existing vulnerabilities.

Reported by

Pepperl+Fuchs SE
Coordinated by CERT@VDE

Support

For Support please contact your local Pepperl+Fuchs sales representative.