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AUSCERT External Security Bulletin Redistribution
ESB-2018.3063
Advisory (ICSA-18-282-04 Siemens SIMATIC S7-1200 CPU Family Version 4
10 October 2018
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AusCERT Security Bulletin Summary
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Product: Siemen Simatic S7-1200
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Cross-site Request Forgery -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-13800
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-282-04
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Advisory (ICSA-18-282-04)
Siemens SIMATIC S7-1200 CPU Family Version 4
Original release date: October 09, 2018
Legal Notice
All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/.
1. EXECUTIVE SUMMARY
o CVSS v3 7.5
o ATTENTION: Exploitable remotely
o Vendor: Siemens
o Equipment: SIMATIC S7-1200 CPU Family Version 4
o Vulnerability: Cross-Site Request Forgery (CSRF)
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a CSRF attack if an
unsuspecting user is tricked into accessing a malicious link.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports the vulnerability affects the following SIMATIC S7-1200 CPU
products:
o SIMATIC S7-1200 CPU Family Version 4: All versions prior to 4.2.3
3.2 VULNERABILITY OVERVIEW
3.2.1 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
The web interface could allow a CSRF attack if an unsuspecting user is tricked
into accessing a malicious link. Successful exploitation requires interaction
with a legitimate user, who must be authenticated to the web interface. A
successful attack could allow an attacker to trigger actions via the web
interface that the legitimate user is allowed to perform. This could allow the
attacker to read or modify parts of the device configuration.
CVE-2018-13800 has been assigned to this vulnerability. A CVSS v3 base score
of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:R/S:U
/C:H/I:H/A:H).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Energy, Food and Agriculture,
Healthcare and Public Health, Transportation Systems, and Water and
Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Lisa Fournet and Marl Joos from P3 communications GmbH reported this
vulnerability to Siemens.
4. MITIGATIONS
Siemens provides a firmware update (v4.2.3) and recommends users update to the
new version. This update can be found on their website at the following
location:
https://support.industry.siemens.com/cs/us/en/view/109741461
To reduce the risk, Siemens recommends users not visit other websites while
being authenticated against the PLC.
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 (https://
www.siemens.com/cert/operational-guidelines-industrial-security), and
following 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 on this vulnerability and associated software updates,
please see Siemens security advisory SSA-507847 on their website:
https://www.siemens.com/cert/advisories
NCCIC 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.
NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for
tracking and correlation against other incidents.
NCCIC also recommends that 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.
High skill level is needed to exploit.
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The University of Queensland
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