ESB-2018.0138 - [Win] WECON LeviStudio HMI Editor: Multiple vulnerabilities 2018-01-12

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0138
Advisory (ICSA-18-011-01) WECON Technology Co., Ltd. LeviStudio HMI Editor
                              12 January 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           WECON LeviStudio HMI Editor
Publisher:         ICS
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Denial of Service               -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-16739 CVE-2017-16737 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-011-01

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Advisory (ICSA-18-011-01)

WECON Technology Co., Ltd. LeviStudio HMI Editor

Original release date: January 11, 2018

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/.

CVSS v3 5.3

ATTENTION: Locally exploitable/low skill level to exploit.

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

Equipment: LeviStudio HMI Editor

Vulnerabilities: Buffer Overflows

AFFECTED PRODUCTS

The following versions of LEVI Studio HMI Editor, an HMI programming software
product, are affected:

  o LEVI Studio HMI Editor v1.8.29 and prior.

IMPACT

Successful exploitation of these vulnerabilities may result in arbitrary 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 these vulnerabilities. Specifically, users should:

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

VULNERABILITY OVERVIEW

STACK-BASED BUFFER OVERFLOW CWE-121

Specially-crafted malicious files may be able to cause stack-based buffer
overflow vulnerabilities, which may allow remote code execution.

CVE-2017-16739 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L
/I:L/A:L).

HEAP-BASED BUFFER OVERFLOW CWE-122

A specially-crafted malicious file may be able to cause a heap-based buffer
overflow vulnerability when opened by a user.

CVE-2017-16737 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:L
/I:L/A:L).

RESEARCHER

Sergey Zelenyuk of RVRT, HanM0u of CloverSec Labs, and Brian Gorenc working
with Zero Day Initiative reported the vulnerabilities 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?

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.

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