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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4626 Advisory (icsa-19-344-01) Siemens SCALANCE W700 and W1700 11 December 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SCALANCE W700 and W1700 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-14526 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-19-344-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-19-344-01) Siemens SCALANCE W700 and W1700 Original release date: December 10, 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 6.5 o ATTENTION: Low skill level to exploit o Vendor: Siemens o Equipment: SCALANCE W700 and W1700 o Vulnerability: Improper Enforcement of Message Integrity During Transmission in a Communication Channel 2. RISK EVALUATION Successful exploitation of this vulnerability could allow an attacker to access confidential data. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of SCALANCE W700 and W1700, wireless communication devices, are affected: o SCALANCE W700 Versions 6.3 and prior o SCALANCE W1700 Versions 1.0 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER ENFORCEMENT OF MESSAGE INTEGRITY DURING TRANSMISSION IN A COMMUNICATION CHANNEL CWE-924 Under certain conditions, the integrity of EAPOL-key messages might not be checked, leading to a decryption oracle. This could be exploited by an attacker within range of the access point, which could allow the abuse of the vulnerability to access confidential data. CVE-2018-14526 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/ C:H/I:N/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Siemens reported this vulnerability to CISA. 4. MITIGATIONS Siemens recommends installing the following software updates to address this vulnerability: o SCALANCE W700: Update to v6.4 or later o SCALANCE W1700: Update to v1.1 or later Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk: o Whenever possible, use AES-CCMP instead of TKIP in the WPA/WPA2 networks. This can be configured for both the SCALANCE W-700 and W-1700 families over the Web Based Management (web server). For more information, go for the respective Manual. As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for Industrial Security and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity For more information on this vulnerability and more detailed mitigation instructions, please see Siemens security advisory SSA-344983 at the following location: http://www.siemens.com/cert/advisories CISA 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. 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. 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 iQIVAwUBXfBw02aOgq3Tt24GAQiSzxAAsgD3rRR2hN4AvCZEOcgeL51zqZGt0t0k PWDuiZXnRFvB57p1heEtdOIh021w/CTu/uX8BsWULX10wGrgBirMY3DW5RdEsVmU 1xi8ZNoJdWimI3pAq4Iylgganw1MYiWR5JMWwMKBDvI3d+08i739lwhfBDHarqUf N2QDSXwHrEAvM3FQqbGMHpMBZS+GUAcYaTMK18QDWhWvJ5IMpiXohvnE0oCecHMm 4Kl1sIb7izZ8QaF2d8+Ixj842bMd0VfQGLkebC4VLDTa6xis1dHIjCMEFJzzIg/O WpwUrodynSHUisL0uMt3i8kjatPgboztqsZG/ZvI6K7Ckwjjc4236xS+gbLKFnrP IAv52Np3bnIBH1gjAK1vr4jOfFtkEeHyHEZnF9wkilodrIB9sflxsLCgFNPKbOOG xmWl88PNqljtwF7NBZFpVtBwictcwk4lwDwS/gIWApAhf5hejtsy+ewpi0XIdo1X qZ0lXjUyUWPjvkJDKMZG1oeM3Xi0uc8ZTE8z4wzKUh60hc6O7EPEm5jrOYVHepqX Tz7vIL9hR9Uh8JP0U0EUJYqOJAVYu1KNhit6gKds0oIGd3n+C+KrTJOXMZiI385f v6aVKel3K/1rJ3+Lvtil+lRO0b5bIkZGqiQzcxKu7BBtTS4X8m6HlE9qyGh//Cgk 7gi7br1y/vI= =DhbL -----END PGP SIGNATURE-----