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TLP:WHITE

Advisory (ICSA-17-353-05)

WECON Technology Co., Ltd. LeviStudio HMI Editor

Original release date: December 19, 2017 | Last revised: February 20, 2018

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CVSS v3 7.3

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: WECON Technology Co., Ltd. (WECON)

Equipment: LeviStudio HMI editor                

Vulnerability: Heap-based Buffer Overflow

AFFECTED PRODUCTS

All versions of LeviStudio HMI, an HMI editor, are affected.

IMPACT

Successful exploitation of this vulnerability could cause the device that the attacker is accessing to crash; a buffer overflow condition may allow remote code execution.

MITIGATION

WECON recommends that users update to the latest version, which can be found at the following location:

http://www.we-con.com.cn/en/download.aspx?id=45

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.

VULNERABILITY OVERVIEW

The heap-based buffer overflow vulnerability has been identified, which may allow remote code execution.

CVE-2017-16717 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

RESEARCHER

Michael DePlante, working with Trend Micro’s Zero Day Initiative, reported the vulnerability to ICS-CERT.

BACKGROUND

Critical Infrastructure Sectors: Critical Manufacturing, Energy, Water and Wastewater Systems

Countries/Areas Deployed: Worldwide

Company Headquarters Location: China


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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