ESB-2018.1306 - [Win] WECON HMI products: Multiple vulnerabilities 2018-04-27

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1306
    Stack-based buffer overflow vulnerabilities in the WECON Technology
        LeviStudio HMI Editor and PI Studio HMI Project Programmer
                               27 April 2018

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

Product:           WECON LeviStudio HMI Editor
                   WECON PI Studio HMI Project Programmer
Publisher:         ICS-CERT
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-2018-7527  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-116-02

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Advisory (ICSA-18-116-02)

WECON Technology Co., Ltd. LeviStudio HMI Editor and PI Studio HMI Project
Programmer

Original release date: April 26, 2018

Legal Notice

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provided "as is" for informational purposes only. The Department of Homeland
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information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
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For more information about TLP, see http://www.us-cert.gov/tlp/.


1. EXECUTIVE SUMMARY

  o CVSS v3 5.9
  o ATTENTION: Low skill level to exploit.
  o Vendor: WECON Technology Co., Ltd. (WECON)
  o Equipment: LeviStudio HMI Editor, and PI Studio HMI Project Programmer
  o Vulnerabilities: Stack-based Buffer Overflow

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow remote code
execution.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of LEVI Studio HMI Editor and PI Studio HMI Project
Programmer, HMI programming software products, are affected:

  o WECON LeviStudioU Version 1.10 part of Wecon LeviStudioU 1.8.29 and prior,
    and
  o PI Studio HMI Project Programmer Build: November 11, 2017 and prior.

3.2 VULNERABILITY OVERVIEW

3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121

A buffer overflow can be triggered by opening a specially crafted file.

CVE-2018-7527 has been assigned to these vulnerabilities. A CVSS v3 base score
of 5.9 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:N/S:U/
C:L/I:L/A:L).

3.3 BACKGROUND

  o Critical Infrastructure Sectors: Critical Manufacturing, Energy, Water and
    Wastewater Systems
  o Countries/Areas Deployed: Worldwide
  o Company Headquarters Location: China

3.4 RESEARCHER

Sergey Zelenyuk of RVRT and Michael DePlante of Leahy Center for Digital
Investigation at Champlain College, both working with Trend Micro's Zero Day
Initiative, reported these vulnerabilities to NCCIC.

4. MITIGATIONS

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

http://wecon-disk.oss-ap-southeast-1.aliyuncs.com/
LeviStudioU20180420%20TEST.exe

NCCIC 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.

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
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 website.

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 these vulnerabilities. These
vulnerabilities is not exploitable remotely.


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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