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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0835 Beckhoff TwinCAT 23 March 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Beckhoff TwinCAT Publisher: ICS-CERT Operating System: Windows Impact/Access: Administrator Compromise -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-7502 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-081-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-081-02) Beckhoff TwinCAT Original release date: March 22, 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/. CVSS v3 7.8 ATTENTION: Low skill level to exploit. Vendor: Beckhoff Equipment: TwinCAT Vulnerability: Untrusted Pointer Dereference AFFECTED PRODUCTS Beckhoff reports that the vulnerability affects the following TwinCAT PLC products: o TwinCAT 3.1 Build 4022.4 or prior, o TwinCAT 2.11 R3 2259 or prior, and o TwinCAT 3.1 C++ / Matlab (TC1210/TC1220/TC1300/TC1320). IMPACT Successful exploitation of this vulnerability could allow local attackers to escalate privileges. MITIGATION Beckhoff recommends users update to the newest version and recompile Matlab modules after updating. Please see Beckhoff Security Advisory 2018-001 at the following location for more information: https://download.beckhoff.com/download/Document/product-security/Advisories/ advisory-2018-001.pdf NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Restrict machine access to only those who need it. o Don't share usernames or passwords. o Monitor and respond to suspicious behavior. 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 in the NCCIC Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website. 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. This vulnerability is not exploitable remotely. VULNERABILITY OVERVIEW UNTRUSTED POINTER DEREFERENCE CWE-822 Several kernel drivers lack proper validation of user-supplied pointer values. An attacker who is able to execute code on the target may be able to exploit this vulnerability to obtain SYSTEM privileges. CVE-2018-7502 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:L/UI:N/S:U/C:H /I:H/A:H). RESEARCHER Steven Seeley of Source Incite reported this vulnerability to NCCIC. BACKGROUND Critical Infrastructure Sectors: Critical Manufacturing, Energy, Water and Wastewater Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany 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 iQIVAwUBWrRsyIx+lLeg9Ub1AQgDYw/+JXjN2FOvymPgZbFGjEvaRnKf0gE/OtDf Rb0uYAm+QPCtQKkIWaJm9QYwNCtIxGG6oJV14/3clxE8cDE2zEn7xDlL80BYkQOZ BehNcF8XJe2mKSPOCKObFGm7FjCbDN+6/bEz+LYCLivW4ugwsH7FugJPuLLvJZ61 f/7NrW5K6sETqpUfl9Fb0GpDq3jUqmlkLetszUEX/qfMSmNcZjeTYxiINfhUIeW3 t7hbyTtlwNNw6DjzSt9StCbEzhubtCZUZI/6fZdSO9LjVXZOFcY4JJcQkTe8UwOg G3IjX8iWr0aaDjAuzU2UMOEZWpNAFunMehsN1Q5nkb5Oa4hp2puv/Z4CF8WgIPHt 5KI76tgNWdo2u/w95yDa35nIigfL0jzrPab0v6XeZ8HIc2WhIp4NCRGRw2S6eUHI wWVYpNlfrfOrJHI3Q1HRsfp+Ar24Qw8sGi04GaiMRlOugJhpePwhXTWKqvlP29b3 3mFKj6WWTFyleu1FAeaBig+N1Fj1WdE+v/uKpaKPJd/jZO5whKGPPuZx1QSY2qs2 RDS4tAlgCgkGNNI+oy9kerXPvehkItEGgRHkJoNXZHqVViIxdRP8rKSm4fex2Cm6 9QD8oR4PJ5/7ewKjSlhCiTGniW4tK6sn12rdVgherco4hAYWTGOVuotgAvUEagx6 NzL3H2WWV5c= =wSQY -----END PGP SIGNATURE-----