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AUSCERT External Security Bulletin Redistribution
ESB-2020.3906
Advisory (icsa-20-310-01) WECON PLC Editor
6 November 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: WECON PLC Editor
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-25181 CVE-2020-25177
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-310-01
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ICS Advisory (ICSA-20-310-01)
WECON PLC Editor
Original release date: November 05, 2020
Legal Notice
All information products included in https://us-cert.cisa.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://us-cert.cisa.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 Vulnerabilities: Stack-based Buffer Overflow, Heap-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
execute code under the privileges of the application.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of PLC Editor, a ladder logic software, are affected:
o PLC Editor Versions 1.3.8 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
A stack-based buffer overflow vulnerability has been identified that may allow
arbitrary code execution.
CVE-2020-25177 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 ).
3.2.2 HEAP-BASED BUFFER OVERFLOW CWE-122
Heap-based buffer overflow vulnerabilities have been identified that may allow
arbitrary code execution.
CVE-2020-25181 has been assigned to these vulnerabilities. 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 (@NattiSamson) and Francis Provencher {PRL}, working with Trend
Micro's Zero Day Initiative, reported these vulnerabilities to CISA.
4. MITIGATIONS
WECON is aware of these vulnerabilities and is currently developing a solution.
For more information, contact WECON online or by phone: 0086-591-87868869-894
CISA recommends users take defensive measures to protect themselves from social
engineering attacks:
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.cisa.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.cisa.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 these vulnerabilities. These
vulnerabilities are 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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