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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2917
                Advisory (icsa-20-238-03) WECON LeviStudioU
                              26 August 2020

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

Product:           WECON LeviStudioU
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-16243  

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-20-238-03

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ICS Advisory (ICSA-20-238-03)

WECON LeviStudioU

Original release date: August 25, 2020

Legal Notice

All information products included in https://us-cert.gov/ics 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 https://www.us-cert.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.8
  o ATTENTION: Low skill level to exploit
  o Vendor: WECON Technology Co., Ltd (WECON)
  o Equipment: LeviStudioU
  o Vulnerability: Stack-based Buffer Overflow

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to
execute code under the privileges of the application.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of LeviStudioU are reported to be affected:

  o LeviStudioU: Version 2019-09-21 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121

Multiple buffer overflow vulnerabilities exist when processing project files.
Opening a specially crafted project file could allow an attacker to exploit and
execute code under the privileges of the application.

CVE-2019-16243 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).

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

Natnael Samson working with Trend Micro's Zero Day Initiative reported this
vulnerability to CISA.

4. MITIGATIONS

WECON is aware of the issue and is currently developed a solution. For more
information, contact WECON online or by phone: 0086-591-87868869-894

CISA recommends users take the following measures to protect themselves from
social engineering attacks:

  o Only use project files from trusted sources.
  o Do not click web links or open unsolicited attachments in email messages.
  o Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
  o Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

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

CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . 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
on the ICS webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.

No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely.

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

CISA 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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