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AUSCERT External Security Bulletin Redistribution
ESB-2021.0492
Advisory (icsa-21-040-05) Siemens TIA Administrator
11 February 2021
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AusCERT Security Bulletin Summary
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Product: Siemens TIA Administrator
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-25238
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ICS Advisory (ICSA-21-040-05)
Siemens TIA Administrator
Original release date: February 09, 2021
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Siemens
o Equipment: TIA Portal and PCS neo
o Vulnerability: Improper Access Control
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow local users to
escalate privileges and execute code as a local SYSTEM user.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Siemens products, are affected:
o PCS neo (Administration Console): v3.0
o TIA Portal: v15, v15.1, and v16
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER ACCESS CONTROL CWE-284
The affected product has improper access controls, which may allow an attacker
to execute code with SYSTEM privileges.
CVE-2020-25238 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Will Dormann from CERT Coordination Center (CERT/CC) reported this
vulnerability to Siemens.
4. MITIGATIONS
Siemens has released the following update and recommends it be applied:
Tia Portal: Update TIA Administrator to v1.0 SP2 Upd2 or later version
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce the risk:
o Restrict local access to authorized users.
o For PCS neo apply measures described in Industrial Security in SIMATIC PCS
neo
As a general security measure, Siemens strongly recommends users protect
network access to devices with appropriate mechanisms. In order to operate the
devices in a protected IT environment, Siemens recommends users configure the
environment according to Siemens' operational guidelines for industrial
security , and follow the recommendations in the product manuals.
Additional information on industrial security by Siemens can be found at:
https://www.siemens.com/industrialsecurity
For more information see Siemens security advisory SSA-428051
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.cisa.gov . Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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