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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-19-162-04) Siemens SCALANCE X
12 June 2019
AusCERT Security Bulletin Summary
Product: Siemens SCALANCE X
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Console/Physical
CVE Names: CVE-2019-6567
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Siemens SCALANCE X
Original release date: June 11, 2019
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1. EXECUTIVE SUMMARY
o CVSS v3 7.1
o ATTENTION: Low skill level to exploit
o Vendor: Siemens
o Equipment: SCALANCE X Switches
o Vulnerability: Storing Passwords in a Recoverable Format
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to
reconstruct passwords for users of the affected devices, if the attacker is
able to obtain a backup of the device configuration.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Siemens SCALANCE X products are affected by this vulnerability:
o SCALANCE X-200:all versions prior to v5.2.4
o SCALANCE X-200IRT: all versions
o SCALANCE X-300: all versions
o SCALANCE X-414-3E: all versions
3.2 VULNERABILITY OVERVIEW
3.2.1 STORING PASWORDS IN A RECOVERABLE FORMAT CWE-257
The affected devices store passwords in a recoverable format. An attacker may
extract and recover device passwords from the device configuration. Successful
exploitation requires access to a device configuration backup and impacts
confidentiality of the stored passwords.
CVE-2019-6567 has been assigned to this vulnerability. A CVSS v3 base score of
7.1 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:C/C:H/
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy,
Food and Agriculture, and Water and Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
Siemens thanks Christopher Wade from Pen Test Partners for coordinated
disclosure. Siemens reported this vulnerability to NCCIC.
Siemens has identified the following specific workarounds/mitigations to reduce
the risk from this vulnerability:
o SCALANCE X-200: Update to v5.2.4 at: https://support.industry.siemens.com/
o SCALANCE X-200IRT: See recommendations following
o SCALANCE X-300: See recommendations following
o SCALANCE X-414-3E: Migrate to the SCALANCE XM400 product line
Until additional updates are available, Siemens recommends users apply the
following workarounds/mitigations to reduce the risk from this vulnerability:
o Restrict access to configuration backups or archived device configuration
o Restrict or disable network access to mechanisms that allow retrieval of
device configuration, if enabled.
o Restrict access to device configuration module C-PLUG, if in use.
As a general security measure, Siemens strongly recommends that users protect
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 S iemens' operational guidelines for Industrial
Security , and to follow the recommendations in the product manuals.
For further inquiries on security vulnerabilities in Siemens products and
solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert
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
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.
No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely.
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