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TLP:WHITE

Advisory (ICSA-18-109-01)

Siemens SIMATIC WinCC OA Operator IOS App

Original release date: April 19, 2018 | Last revised: April 25, 2018

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1. EXECUTIVE SUMMARY

  • CVSS v3 4.0
  • Vendor: Siemens
  • Equipment: Simatic WinCC OA iOS App
  • Vulnerability: File and Directory Information Exposure.

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker with physical access to read sensitive data located in the app’s directory.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports this vulnerability affects the following product:

  • SIMATIC WinCC OA Operator iOS App: All Versions.

3.2 VULNERABILITY OVERVIEW

3.2.1  FILE AND DIRECTORY INFORMATION EXPOSURE CWE-538

An attacker with physical access to the mobile device could read unencrypted sensitive data from the app’s directory.

CVE-2018-4847 has been assigned to this vulnerability. A CVSS v3 base score of 4.0 has been calculated; the CVSS vector string is (AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N).

3.3 BACKGROUND

  • Critical Infrastructure Sectors: Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems
  • Countries/Areas Deployed: Worldwide
  • Company Headquarters Location: Germany

3.4 RESEARCHER

Alexander Bolshev of IOActive and Ivan Yushkevich of Embedi reported this vulnerability to Siemens.

4. MITIGATIONS

Siemens has identified the following specific workarounds and mitigations that users can apply to reduce the risk:

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 (Download: 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 mitigation practices, please see Siemens security advisory SSA-597741 on their website:

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. High skill level is needed to exploit.


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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