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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-19-353-03) WECON PLC Editor
20 December 2019
AusCERT Security Bulletin Summary
Product: WECON PLC Editor
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2019-18236
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ICS Advisory (ICSA-19-353-03)
WECON PLC Editor
Original release date: December 19, 2019
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
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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/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: WECON
o Equipment: PLC Editor
o Vulnerability: Stack-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation could allow an attacker to execute code under the
privileges of the application.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following version of PLC Editor, a ladder logic software, is reported to be
o Version 1.3.5_20190129
Additional versions may also be vulnerable.
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
Multiple buffer overflow vulnerabilities exist when processing project files.
An attacker could use a specially crafted project file to exploit and execute
code under the privileges of the application.
CVE-2019-18236 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/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: China
Francis Provencher (PRL) and Natnael Samson (Natti) working with Trend Micro's
Zero Day Initiative reported this vulnerability to CISA.
WECON has a strategy to address the issues and is currently developing a
For more information contact WECON customer service on the web or phone:
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
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.
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