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# SSA-428051: Privilege Escalation Vulnerability in TIA Administrator

Publication Date:        2021-02-09
Last Update:             2021-09-14
Current Version:         1.1
CVSS v3.1 Base Score:    7.8

SUMMARY
=======

The latest update for TIA Administrator, installed together with TIA
Portal and PCS neo, fixes a privilege escalation vulnerability that
could allow local users to escalate privileges and execute code as local
SYSTEM user.

Siemens has released updates for the affected products and recommends to
update to the latest versions.


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


* PCS neo (Administration Console) 
  - Affected versions:
       All versions < V3.1
  - Remediation:
       Update to V3.1 or later version
  - Download:
       To obtain SIMATIC PCS neo V3.1 contact your local customer support.

* TIA Portal 
  - Affected versions:
       V15, V15.1 and V16
  - Remediation:
       Update TIA Administrator to V1.0 SP2 Upd2 or later version
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/114358/


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

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

* Restrict local access to authorized users.

* For PCS neo apply measures described in "Industrial Security in SIMATIC
PCS neo": https://support.industry.siemens.com/cs/ww/en/view/109771524



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
===================

SIMATIC PCS neo is a distributed control system (DCS).

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.

TIA Administrator is a web-based framework that can incorporate
different function modules for administrative tasks, as well as
functions for managing SIMATIC software and licenses.

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-2020-25238

  Manipulating certain files in specific folders could allow a local
  attacker to execute code with SYSTEM privileges.
  
  The security vulnerability could be exploited by an attacker with a
  valid account and limited access rights on the system.

  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:O/RC:C
  CWE:                  CWE-284: Improper Access Control


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

Siemens thanks the following parties for their efforts:

   * Will Dormann from CERT Coordination Center (CERT/CC) for coordinated disclosure



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 (2021-02-09): Publication Date
V1.1 (2021-09-14): Added solution for SIMATIC PCS neo

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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