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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3906 Advisory (icsa-20-310-01) WECON PLC Editor 6 November 2020 =========================================================================== 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 - --------------------------BEGIN INCLUDED TEXT-------------------- 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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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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