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# SSA-629512: Local Privilege Escalation Vulnerability in TIA Portal

Publication Date:        2020-01-14
Last Update:             2021-12-14
Current Version:         1.3
CVSS v3.1 Base Score:    7.8

SUMMARY
=======

The latest updates for TIA Portal fix a vulnerability that could allow a
local attacker to execute arbitrary code with SYSTEM privileges.

Update: The previously provided fixes only correctly set the permissions
on English Windows versions.

Siemens is preparing updates and recommends specific countermeasures for
products where updates are not, or not yet available.


AFFECTED PRODUCTS AND SOLUTION
==============================


* TIA Portal V14
  - Affected versions:
       All versions
  - Remediation:
       Currently no remediation is available
       See recommendations from section "Workarounds and Mitigations"

* TIA Portal V15
  - Affected versions:
       All versions
  - Remediation:
       Currently no remediation is available
       See recommendations from section "Workarounds and Mitigations"

* TIA Portal V16
  - Affected versions:
       All versions
  - Remediation:
       Currently no remediation is available
       See recommendations from section "Workarounds and Mitigations"

* TIA Portal V17
  - Affected versions:
       All versions
  - Remediation:
       Currently no remediation is available
       See recommendations from section "Workarounds and Mitigations"


WORKAROUNDS AND MITIGATIONS
===========================

Siemens has identified the following specific workarounds and mitigations that
customers can apply to reduce the risk:

* Remove write permissions for every non-administrative user on files and
folders located below the "TraceEngine" folder (usually located at
"C:\ProgramData\Siemens\Automation").

* A partially working fix for Native Language Windows Versions in English
or Multilingual User Interface (MUI) Windows Installation was included
in TIA Portal Versions V14 SP1 Update 10, V15 SP1 Update 4,V16 Update 1
and V17.



GENERAL SECURITY RECOMMENDATIONS
================================

As a general security measure, Siemens strongly recommends to protect
network access to devices with appropriate mechanisms. In order to
operate the devices in a protected IT environment, Siemens recommends to
configure the environment according to Siemens' operational guidelines
for Industrial Security (Download:
https://www.siemens.com/cert/operational-guidelines-industrial-security),
and to follow the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found
at: https://www.siemens.com/industrialsecurity

PRODUCT DESCRIPTION
===================

The Totally Integrated Automation Portal (TIA Portal) is a PC software
that provides access to the complete range of Siemens digitalized
automation services, from digital planning and integrated engineering to
transparent operation.

VULNERABILITY CLASSIFICATION
============================

The vulnerability classification has been performed by using the CVSS scoring
system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS
environmental score is specific to the customer's environment and will impact
the overall CVSS score. The environmental score should therefore be
individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a
community-developed list of common software security weaknesses. This serves as
a common language and as a baseline for weakness identification, mitigation,
and prevention efforts. A detailed list of CWE classes can be found at:
https://cwe.mitre.org/.



* Vulnerability CVE-2019-10934

  Changing the contents of a configuration file could allow an attacker to
  execute arbitrary code with SYSTEM privileges.
  
  The security vulnerability could be exploited by an attacker with a
  valid account and limited access rights on the system. No user
  interaction is required.
  
  At the time of advisory publication no public exploitation of this
  security vulnerability was known.

  CVSS v3.1 Base Score: 7.8
  CVSS Vector:          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C
  CWE:                  CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path
Traversal')


ACKNOWLEDGMENTS
===============

Siemens thanks the following parties for their efforts:

   * Siemens Energy for pointing out, that the initial fix was only partially functional
   * Wiliam Knowles from Applied Risk for reporting the vulnerability



ADDITIONAL INFORMATION
======================

For further inquiries on security vulnerabilities in Siemens products and
solutions, please contact the Siemens ProductCERT:

https://www.siemens.com/cert/advisories


HISTORY DATA
============

V1.0 (2020-01-14): Publication Date
V1.1 (2020-04-14): Added solution for TIA Portal V16
V1.2 (2021-01-12): Added solution for TIA Portal V14
V1.3 (2021-12-14): Errata: Removed solutions: The previously provided fixes only correctly
set the permissions on Native Language Windows Versions in English or
Multilingual User Interface (MUI) Windows Installations and added TIA
Portal V17 as affected product.

TERMS OF USE
============

Siemens Security Advisories are subject to the terms and conditions contained
in Siemens' underlying license terms or other applicable agreements previously
agreed to with Siemens (hereinafter "License Terms"). To the extent applicable
to information, software or documentation made available in or through a
Siemens Security Advisory, the Terms of Use of Siemens' Global Website
(https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in
particular Sections 8-10 of the Terms of Use, shall apply additionally. In case
of conflicts, the License Terms shall prevail over the Terms of Use.
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