U.S. Flag Official website of the Department of Homeland Security
U.S. Department of Homeland Security Seal. ICS-CERT. Industrial Control Systems Cyber Emergency Response Team.
TLP:WHITE

Advisory (ICSA-15-055-03)

Schneider Electric Invensys Positioner Buffer Overflow Vulnerability

Original release date: February 24, 2015

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/.



OVERVIEW

Ivan Sanchez from Nullcode Team has identified a buffer overflow security vulnerability in the DTM (Device Type Manager) software for Schneider Electric’s Invensys SRD Control Valve Positioner product line. Schneider Electric has produced a new version that mitigates this vulnerability.

AFFECTED PRODUCTS

The following Schneider Electric products are affected:

  • DTM Version 3.1.6 and all previous versions used with SRD 960 and SRD 991 Control Valve Positioners.

IMPACT

An attacker who exploits this vulnerability may be able to execute arbitrary code.

Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.

BACKGROUND

Schneider Electric’s corporate headquarters is located in Paris, France, and maintains offices in more than 100 countries worldwide.

The affected products, SRD 960 and SRD 991 Control Valve Positioners, operate pneumatic valve actuators. According to Schneider Electric, these products are deployed across several sectors including Critical Manufacturing, Energy, Water and Wastewater Systems, and others. Schneider Electric estimates that these products are used globally.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

STACK-BASED BUFFER OVERFLOWa

The vulnerability identified includes a stack buffer overflow condition in a DLL file that could possibly result in remote code execution.

CVE-2014-9206b has been assigned to this vulnerability. A CVSS v2 base score of 5.2 has been assigned; the CVSS vector string is (AV:L/AC:H/Au:N/C:P/I:P/A:C).c

VULNERABILITY DETAILS

EXPLOITABILITY

This vulnerability is not exploitable remotely and cannot be exploited without user interaction. The exploit is only triggered when a local user runs the vulnerable application and loads the malformed DLL file.

EXISTENCE OF EXPLOIT

No known public exploits specifically target this vulnerability.

DIFFICULTY

Crafting a working exploit for this vulnerability would be difficult. Social engineering is required to convince the user to accept the malformed DLL file. Additional user interaction is needed to load the malformed file. This decreases the likelihood of a successful exploit.

MITIGATION

Schneider Electric encourages customers using these products to download the latest version, V3.6.3, that mitigates this vulnerability. It can be found at the bottom of the following web site:

http://www.foxboro-eckardt.eu/download/FDT-DTMselector.html

Schneider Electric’s security notice SEVD-2015-050-01 is available at the following location:

http://download.schneider-electric.com/files?p_File_Id=740491624&p_File_Name=SEVD-2015-050-01.pdf

ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks.

  • Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.
  • Locate control system networks and remote devices behind firewalls, and isolate them from the business network.
  • 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.

ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page at: http://ics-cert.us-cert.gov/content/recommended-practices. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

Additional mitigation guidance and recommended practices are publicly available in the ICS‑CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site (http://ics-cert.us-cert.gov/).

Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.

In addition, ICS-CERT recommends that users take the following measures to protect themselves from social engineering attacks:

  1. Do not click web links or open unsolicited attachments in email messages.
  2. Refer to Recognizing and Avoiding Email Scamsd for more information on avoiding email scams.
  3. Refer to Avoiding Social Engineering and Phishing Attackse for more information on social engineering attacks.


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?

The NCCIC continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.

Was this document helpful?  Yes  |  Somewhat  |  No

Back to Top