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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.1311 Advisory (ICSA-19-106-02) WAGO Series 750-88x and 750-87x 17 April 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: WAGO Series 750-88x and 750-87x PLCs Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Increased Privileges -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-10712 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-19-106-02 - --------------------------BEGIN INCLUDED TEXT-------------------- TITLE: Advisory (ICSA-19-106-02) WAGO Series 750-88x and 750-87x Original release date: April 16, 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 9.8 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: WAGO o Equipment: Series 750-88x and 750-87x o Vulnerability: Use of Hard-coded Credentials 2. RISK EVALUATION This vulnerability allows a remote attacker to change the settings or alter the programming of the device. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Series 750-88x and 750-87x, programmable logic controllers, are affected: o Series 750-88x 750-330 firmware versions prior to FW14 750-352 firmware versions prior to FW14 750-829 firmware versions prior to FW14 750-831 firmware versions prior to FW14 750-852 firmware versions prior to FW14 750-880 firmware versions prior to FW14 750-881 firmware versions prior to FW14 750-882 firmware versions prior to FW14 750-884 firmware versions prior to FW14 750-885 firmware versions prior to FW14 750-889 firmware versions prior to FW14 o Series 750-87x 750-830 firmware versions prior to FW06 750-849 firmware versions prior to FW08 750-871 firmware versions prior to FW11 750-872 firmware versions prior to FW07 750-873 firmware versions prior to FW07 3.2 VULNERABILITY OVERVIEW 3.2.1 USE OF HARD-CODED CREDENTIALS CWE-798 By exploiting the undocumented service access, it is possible to change the settings of a device and access web-based management with administrator privileges. An attacker can exploit this vulnerability to lock other users out from the device or open closed network ports. It is also possible to use this service access as an FTP user and exchange or delete the application. CVE-2019-10712 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical Manufacturing, Energy, Transportation Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United States, Germany, Switzerland, Poland, China, India 3.4 RESEARCHER Reported by Jorn Schneeweisz/Recurity Labs to CERT-Bund coordinated by CERT@VDE with NCCIC. 4. MITIGATIONS WAGO released a security advisory available at: https://www.wago.com/de/download/public/Sicherheitshinweis-SA-SYS-2019-001/ SA-SYS-2019-001.pdf WAGO recommends updating to the newest firmware as listed above and taking the following defensive measures: o Restrict network access to the web server. o Restrict network access to the device. o Do not directly connect the device to the Internet. CERT@VDE has published an advisory regarding this vulnerability at the following location: https://cert.vde.com/en-us/advisories/vde-2019-008 NCCIC 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. - --------------------------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 iQIVAwUBXLZx72aOgq3Tt24GAQjv1BAAzy2flm06Y0B6mOBHAFdvw3+3C/R0MFwy 4wGaaT5gLtdp/uOWAgPHdW9rSBi0Gy8vk5tbMshqmIxKC930r3fKkpqOqdJrQhTA RIbwqrntVH8shJFQJpZPyt/WRtVuHSVJMRJQ0+r64CJRFg7hqGAiC+LtftyuUwVQ WaARSBB8+YXeIniI8gtACcf6WlQ/foKRXyXNYlkaBaXTJjxS5d+SkWHd7kxSjcoU XO4WV1/xNK76kPiGI5GgeTeeQ0hMlwiUrkKO+UsJrdqpsGBHnqS3L++dOuRDglqt d735olE6PjYicrxHZNuTmzXXK0VHN/BqijaWegJZRnCfqNLIuGUbELHvJC6QiLE3 HaKcBOIlHM1LMVHAyNnpvqp45pHAgD2B23s+TDWtfR6LHl+TWSdFYlO/oqIo9yBI PFKNmo+OG4K9S7Mt/JE7Nbb3HI1RNGJ9NeN/aivgPUzN1KxpxB0m4Uuc5YZALn7u CKeWklwPSa1h3EUzkpvednMD66HJWyrbRK+hI6yq6ru6dvcQODXYVl9P3pq1Kvml q269dPw6aAbQ0lvIL/ov9doMt4nJMknIXQazRz/Y4UeyVuoMqnOyYmRzHO4x0g0/ SyqsHgwsOB5GdZqAsXlI2aDsBGnw3PddlK7fMpOIz6teMbOrpC/hY0ADAYhIYd1a t99l2va+Wuk= =SYQG -----END PGP SIGNATURE-----