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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4726 Advisory (icsa-19-353-03) WECON PLC Editor 20 December 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: WECON PLC Editor Publisher: ICS-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Mitigation CVE Names: CVE-2019-18236 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-19-353-03 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-19-353-03) WECON PLC Editor Original release date: December 19, 2019 Legal Notice 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 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 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 affected: 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/ 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 Francis Provencher (PRL) and Natnael Samson (Natti) working with Trend Micro's Zero Day Initiative reported this vulnerability to CISA. 4. MITIGATIONS WECON has a strategy to address the issues and is currently developing a solution. For more information contact WECON customer service on the web or 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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