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AUSCERT External Security Bulletin Redistribution
ESB-2018.3064
Advisory (ICSA-18-282-02) Siemens SCALANCE W1750D
10 October 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens Scalance W1750D
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-13099
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-282-02
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Advisory (ICSA-18-282-02)
Siemens SCALANCE W1750D
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 5.9
o ATTENTION: Exploitable remotely/public exploits are available
o Vendor: Siemens
o Equipment: SCALANCE W1750D
o Vulnerability: Cryptographic issues
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to
decrypt TLS traffic.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports the vulnerability affects the following SCALANCE W1750D
products:
o SCALANCE W1750D: All versions prior to v8.3.0.1
3.2 VULNERABILITY OVERVIEW
3.2.1 CRYPTOGRAPHIC ISSUES CWE-310
An attacker with network access to affected devices could potentially obtain a
TLS session key. If the attacker is able to observe TLS traffic between a
legitimate user and the device, the attacker could decrypt the TLS traffic.
CVE-2017-13099 has been assigned to this vulnerability. A CVSS v3 base score
of 5.9 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/
C:H/I:N/A:N).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Energy, Food and Agriculture,
Healthcare and Public Health, Transportation Systems, Water and Wastewater
Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported this vulnerability to NCCIC.
4. MITIGATIONS
Siemens provides a firmware update (v8.3.0.1) and recommends users to 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/109760581
To reduce the risk, Siemens recommends administrators restrict access to the
web interface of the affected devices.
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-464260 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.
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