ESB-2017.3249 - [Appliance] LeviStudio HMI: Execute arbitrary code/commands - Remote/unauthenticated 2017-12-20

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.3249
              Remote code execution patched in LeviStudio HMI
                             20 December 2017

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

Product:           LeviStudio HMI
Publisher:         Wecon Technology Co
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-16717  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-353-05

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ATTENTION: Remotely exploitable/low skill level to exploit.

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

Equipment: LeviStudio HMI                                       

Vulnerability: Heap-based Buffer Overflow

AFFECTED PRODUCTS

All versions of LeviStudio HMI, an HMI, 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

HEAP-BASED BUFFER OVERFLOW CWE-122

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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===========================================================================
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The University of Queensland
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