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TLP:WHITE

Advisory (ICSA-19-162-04)

Siemens SCALANCE X

Original release date: June 11, 2019

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1. EXECUTIVE SUMMARY

  • CVSS v3 7.1
  • ATTENTION: Low skill level to exploit
  • Vendor: Siemens
  • Equipment: SCALANCE X Switches
  • 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: 

  • SCALANCE X-200: all versions prior to v5.2.4
  • SCALANCE X-200IRT: all versions
  • SCALANCE X-300: all versions
  • 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/I:N/A:N).

3.3 BACKGROUND

  • CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, and Water and Wastewater Systems
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens thanks Christopher Wade from Pen Test Partners for coordinated disclosure. Siemens reported this vulnerability to NCCIC.

4. MITIGATIONS

Siemens has identified the following specific workarounds/mitigations to reduce the risk from this vulnerability: 

Until additional updates are available, Siemens recommends users apply the following workarounds/mitigations to reduce the risk from this vulnerability: 

  • Restrict access to configuration backups or archived device configuration data; 
  • Restrict or disable network access to mechanisms that allow retrieval of device configuration, if enabled.
  • 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 Siemens’ 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/advisories

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.

No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely.


Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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