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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-20-014-05) Siemens TIA Portal
16 January 2020
AusCERT Security Bulletin Summary
Product: Siemens TIA Portal
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Existing Account
CVE Names: CVE-2019-10934
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ICS Advisory (ICSA-20-014-05)
Siemens TIA Portal
Original release date: January 14, 2020
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1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Siemens
o Equipment: TIA Portal
o Vulnerability: Path Traversal
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a local attacker to
execute arbitrary code with SYSTEM privileges.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of TIA Portal, the Totally Integrated Automation Portal,
o TIA Portal v14: All versions
o TIA Portal v15: All versions prior to v15.1 Upd 4
o TIA Portal v16: All versions
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH
Changing the contents of a configuration file could allow an attacker to
execute arbitrary code with SYSTEM privileges. This vulnerability could be
exploited by an attacker with a valid account and limited access rights on the
system. No user interaction is required.
CVE-2019-10934 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/
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy,
Food and Agriculture, Water and Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
\William Knowles from Applied Risk reported this vulnerability to Siemens.
Siemens recommends installing the following software update to address this
o TIA Portal V15: Update to v15.1 Upd 4
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce the risk:
o Remove write permissions for every non-administrative user on files and
folders located below the "TraceEngine" folder (usually located at "C:\
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:
For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens security advisory SSA-629512
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.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.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
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.
No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely.
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