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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-19-281-04) Siemens SIMATIC IT UADM
9 October 2019
AusCERT Security Bulletin Summary
Product: Siemens SIMATIC IT UADM
Operating System: Windows
Impact/Access: Access Privileged Data -- Existing Account
CVE Names: CVE-2019-13929
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ICS Advisory (ICSA-19-281-04)
Siemens SIMATIC IT UADM
Original release date: October 08, 2019
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1. EXECUTIVE SUMMARY
o CVSS v3 6.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Siemens
o Equipment: SIMATIC IT Unified Architecture Discrete Manufacturing (UADM)
o Vulnerability: Use of Hard-coded Cryptographic Key
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to gain
read and write access to the related TeamCenter station.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Siemens SIMATIC IT UADM, a part of the SIMATIC IT
manufacturing execution system, are affected:
o SIMATIC IT UADM: All versions prior to 1.3
3.2 VULNERABILITY OVERVIEW
3.2.1 USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321
An authenticated remote attacker could recover a password over Port 1434/TCP,
which may be used to gain read/write access to the related TeamCenter station.
CVE-2019-13929 has been assigned to this vulnerability. A CVSS v3 base score of
6.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:C/C:H/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
Siemens reported this vulnerability to CISA.
Siemens recommends users update to Version 1.3, which can be obtained from a
Siemens account manager.
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce the risk:
o Protect network access to Port 1434/TCP of machines running SIMATIC IT UADM
o Apply cell protection concept and implement defense-in-depth.
As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. In order to operate the devices
in a protected IT environment, Siemens recommends configuring the environment
according to Siemens' operational guidelines for Industrial Security , and
following 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-984700 at the following
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
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.
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