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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0939 Advisory (icsa-21-075-01) Advantech WebAccess/SCADA 17 March 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Advantech WebAccess/SCAD Publisher: ICS-CERT Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Cross-site Scripting -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2021-27436 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-075-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-075-01) Advantech WebAccess/SCADA Original release date: March 16, 2021 Legal Notice All information products included in https://us-cert.cisa.gov/ics 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 https://us-cert.cisa.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 5.4 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Advantech o Equipment: WebAccess/SCADA o Vulnerability: Cross-site Scripting 2. RISK EVALUATION Successful exploitation of this vulnerability could allow an unauthorized user to steal a user's cookie/session token or redirect an authorized user to a malicious webpage. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of WebAccess/SCADA, a browser-based SCADA software package, are affected: o WebAccess/SCADA Versions 9.0 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE SCRIPTING') CWE-79 The affected product is vulnerable to cross-site scripting, which may allow an attacker to send malicious JavaScript code to an unsuspecting user, which could result in hijacking of the user's cookie/session tokens, redirecting the user to a malicious webpage and performing unintended browser actions. CVE-2021-27436 has been assigned to this vulnerability. A CVSS v3 base score of 5.4 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/ C:L/I:L/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: East Asia, Europe, United States o COMPANY HEADQUARTERS LOCATION: Taiwan 3.4 RESEARCHER Chizuru Toyama of TXOne IoT/ICS Security Research Labs of Trend Micro reported this vulnerability to CISA. 4. MITIGATIONS Advantech recommends users update to Version 9.0.1 or later. 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.cisa.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.cisa.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. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov Toll Free: 1-888-282-0870 CISA 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 iQIVAwUBYFGBU+NLKJtyKPYoAQgDbg/+NqDdLYDQv1SDnH+w8ng4ln5Hr9HS0xzG o4shlTeTNBrDp8ea6mBFO4o4IS1fPSAd73A6eSmlgIqq0qenMTZlT1LYqkPGs1CQ K5B1n4jjNfNE3LHEbh2FIMqaV9JE64LU7yGbZjAy7j04/+bfVb7roYSMRqEecJCj vQ9YtPITWm/OqWRWvAl6BbxATvH/VdCMoA6qYAnlJfoy8+N0X8RWqzkfsKejLr7Z tL3Idg/5ASavaYwz2jEhvIUhxJGabrojGfQ9OTpy65nTj9HQa+63+2Hb3vnhaKJy cTIUchQNICpqEDyCdJ1GbqmBGYC8ooGKdhWsawulR3j+ddHxRZOzdooWhU+H+XYd wJSoEQ5JMmqo3RfCxXmujmVMUMsXssf+KpjWW6g8RDsWJCUY+FpQX8mrJMU72tSw lKPG0mkLMZFqcGTjLtVRZDHOyWkwkusucVDHQcMniakfVxTqtQPKoz5Pz0EJOu/D YXMJHH6Zlpg1m23W4zFpK1CY3EtVM+sYTVOfwSBuEZ1JPNjBsHuIZpeSw2/2pK2j 0jShSfqkpk240xe28tM8y6uHDMjDiHr01cZ/UN391W6/6ebt5Z4V9Tz4abfTo4mI eRqdU/0VclM7xXcnKlcB22jYbCBKeywpfKUtpV2GI0vNuiyvKdTcIoBxtvfCwN1E 9+Ov1kC+JJQ= =hP9O -----END PGP SIGNATURE-----