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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2793 WECON PLC Editor security vulnerability 19 September 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: WECON PLC Editor Publisher: ICS-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Resolution: Mitigation CVE Names: CVE-2018-14792 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-261-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-261-01) WECON PLC Editor Original release date: September 18, 2018 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 6.3 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: WECON o Equipment: PLC Editor o Vulnerability: Stack-based Buffer Overflow 2. RISK EVALUATION Successful exploitation of this vulnerability could result in unauthorized code execution within the current process. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following version of PLC Editor, a ladder logic software, are reported to be affected: o 1.3.3U Additional versions may also be vulnerable. 3.2 VULNERABILITY OVERVIEW 3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121 When processing project files a stack-based overflow vulnerability can be exploited, which may allow an attacker to execute code under the current process. CVE-2018-14792 has been assigned to this vulnerability. A CVSS v3 base score of 6.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L /I:L/A:L). 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 (Natti) working with Trend Micro's Zero Day Initiative reported this vulnerability to NCCIC. 4. MITIGATIONS WECON has verified the vulnerability but has not yet released an updated version. All users should limit application interaction to only trusted files and update software to the latest version as updates become available. NCCIC recommends that users take the following 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. NCCIC also recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. o Locate control system networks and remote devices behind firewalls, and isolate them from the business network. o When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. Contact Information For any questions related to this report, please contact the NCCIC at: Email: NCCICCUSTOMERSERVICE@hq.dhs.gov Toll Free: 1-888-282-0870 For industrial control systems cybersecurity information: http:// ics-cert.us-cert.gov or incident reporting: https://ics-cert.us-cert.gov/Report-Incident? The NCCIC 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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBW6HliGaOgq3Tt24GAQgO2g//W6OmALXt7r+w5BGFrpdj3XS8OLUQhU6M /oDLIp6x2pRkpNrx5NQgAIWi1lGE7Is/GUcw3c7g+dNsC9mdONe1IieKmqncBVbd Rpygy/MzhHYVG1ceu9aGNRxSNwoCfWhSU5u+BFOMK2t0wXKE/IQLX57RwrNjffuq gYqW09ODTsRLhtuq2Nk3Ek93IKyM83/geYm71B3OoEXu8NoMraofWKP6i9GBhu2X qZo0gay4FdZHi9zAVAZRl4yI5m+KzYVvdrc8mdnBQUFXrekVZpG8y7z/B68DTI8h CnKIxBB3t7gy/ialJ2mrZzavxP41/N0V1cdFHsyFzHFx+1+gLYIcNt4spryuk8JD wc0aa9KzzPv99/I/RVsDYqTYYDU1wtC0BWK9sj5lbvaSw6VpoRjX8vP7LsZVhoyM HoHQytTqvtc3TBh99EpeDNOOwqLb2M5TBg8CL7wMAXZx4JTLjDAKHBa/9bXTrbPy brEXJ804GN+CVfo5IIO0m7L/Wv427/jC1dH9AQHFZZmbqmVMjYQIvnUcyC52I47A gYrAqsp01bw5uX9OLC2b4uOdpvYZ6behZZXe6wnKacIuF3W1SWqWtpC0SbN9UjhV BaOcZzrCUhqh3FvHRwg5DuEN0AXZEI6zX9D2xH+F661OuZchV2z4ADqisPuwb+5f ay7lBd1MIL4= =Z2WK -----END PGP SIGNATURE-----