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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.3445 Advisory (icsa-19-253-04) Siemens IE-WSN-PA Link WirelessHART Gateway 11 September 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens IE-WSN-PA Link WirelessHART Gateway Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Cross-site Scripting -- Remote with User Interaction Resolution: Mitigation CVE Names: CVE-2019-13923 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-19-253-04 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-19-253-04) Siemens IE-WSN-PA Link WirelessHART Gateway Original release date: September 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 7.5 o ATTENTION: Exploitable remotely o Vendor: Siemens o Equipment: IE/WSN-PA Link WirelessHART Gateway o Vulnerability: Cross-site Scripting 2. RISK EVALUATION Successful exploitation of this vulnerability could allow information disclosure, code execution, or denial-of-service. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS All versions of IE/WSN-PA Link WirelessHART Gateway are affected. 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE SCRIPTING') CWE-79 An attacker sending a malicious link to an unsuspecting user may be able to execute a cross-site scripting attack, which may allow information disclosure, code execution, or denial-of-service. CVE-2019-13923 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/ C:H/I:H/A:H ). 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 has identified the following specific workarounds and mitigations that users can apply to reduce the risk: o Only access links from trusted sources in the browser used to configure IE/ WSN-PA Link. As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens' operational guidelines for industrial security (download: https://www.siemens.com/cert/ operational-guidelines-industrial-security ), and 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, please see Siemens Security Advisory SSA-191683 at the following location: http://www.siemens.com/cert/advisories CISA recommends 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. 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. High skill level is needed to exploit. - --------------------------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 iQIVAwUBXXhaFGaOgq3Tt24GAQjarA/+JW05Ct/cRLb+ZYxvq1nOXkPpX+fYnSoc WAbG2/ykwr2pKieOuoKBGs8rqgWZX6emajctJ2YdXa7P8DkheZ5EGH168aPMvr6d WVQxZwa4NGHCW96WA82K7qMqTqko7N1hj15QVZYMk4vnxj1nQobz7CuWs3twrzzi A+/J0HopXOlq3XESemknZXzc0G/AeUsbfj+Jtqz8u4wghH16AorIQSB0cVnexnfX Y4jhOoG0NuEyxHAZ48pRWb4YsZ+O06KHKCB8Fa9xKyLLjyEKRnXu90bV72ghGfvo zB7ANhKFS+ToKqZU4SnAgx2g9m0YerTgMZdv2NDp//4ACpqz1dbTHN1VsGamulxV ZkbSCdLjJv2yQolmJyN7yhakSEnIG+amuJrIJ4wHTijCO3m9Daic6TZ1kZpudMvT nSZvhJoT4HkvoUpMaDB/eNCjLzicnfH4madD3VjusrNKQwPtOpaIA0tyFEoHSf7s OqsHyJa3SpetSq/JrXhnA6IcUHQI+merHpnPpyY3ivasPdmPLHQlAKnbHcQdt0vy 1yVEBoCo65qS7yMGfDatIfF3ZBZaKVHczqpf7sXMkwsDso6sZk/rEpAE7OAZi5tz TqwEowjqr0xQ1+r5iY57/huN5JByuBpbySiMy0GfWxQV4N92GDmIWE87tt2tZckD vo1w3TQLrKM= =QhCo -----END PGP SIGNATURE-----