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Advisory (ICSA-17-061-02)

Schneider Electric Conext ComBox

Original release date: March 02, 2017

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CVSS v3 7.5

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Schneider Electric

Equipment: Conext ComBox

Vulnerability: Resource Exhaustion

AFFECTED PRODUCTS

Schneider Electric reports that the vulnerability affects the following Conext ComBox solar battery monitor:

  • Conext ComBox, model 865-1058: all firmware versions prior to V3.03 BN 830

IMPACT

Successful exploitation of this vulnerability could cause the device to self-reboot, constituting a denial of service.

MITIGATION

Schneider Electric has released a new version of firmware (V3.03 BN 830) to address this vulnerability. It is available to be downloaded from the following location:

http://solar.schneider-electric.com/product/conext-combox/

Users can learn more about this vulnerability and the associated firmware fix by reading Schneider Electric’s security notification SEVD-2017-052-01 on their web site at the following location:

http://www.schneider-electric.com/ww/en/download/document/SEVD-2017-052-01

NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:

  • 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 reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

ICS-CERT 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 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.

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.

No known public exploits specifically target this vulnerability. This vulnerability is remotely exploitable. Low skill level is needed to exploit.

VULNERABILITY OVERVIEW

A series of rapid requests to the device may cause it to reboot.

CVE-2017-6019 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

RESEARCHER

Arik Kublanov and Mark Liapustin of Nation-E Ltd reported this vulnerability.

BACKGROUND

Critical Infrastructure Sector: Energy

Areas Deployed: Worldwide

Company Headquarters Location: Paris, France

 


Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov
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International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov

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