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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2116 Advisory (ICSA-18-200-04): Moxa NPort 5210 5230 5232 20 July 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Moxa NPort products Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-10632 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-200-04 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-200-04) Moxa NPort 5210 5230 5232 Original release date: July 19, 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/. 1. EXECUTIVE SUMMARY CVSS v3 7.5 ATTENTION: Exploitable remotely/low skill level to exploit Vendor: Moxa Equipment: NPort 5210, 5230, 5232 Vulnerability: Resource Exhaustion 2. RISK EVALUATION Successful exploitation of this vulnerability could allow a remote attacker to send TCP SYN packages, causing a resource exhaustion condition that would cause the device to become unavailable. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of NPort, a serial network interface, are affected: NPort 5210, 5230, and 5232 Versions 2.9 build 17030709 and prior. 3.2 VULNERABILITY OVERVIEW 3.2.1 UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400 The amount of resources requested by a malicious actor are not restricted, allowing for a denial-of-service condition. CVE-2018-10632 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H). 3.3 BACKGROUND CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, and Transportation Systems COUNTRIES/AREAS DEPLOYED: Worldwide COMPANY HEADQUARTERS LOCATION: Taiwan 3.4 RESEARCHER Mikael Vingaard reported this vulnerability to NCCIC. 4. MITIGATIONS Moxa recommends that users upgrade to the latest firmware version, which can be found at: https://www.moxa.com/support/download.aspx?type=support&id=904 NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. Locate control system networks and remote devices behind firewalls, and isolate them from the business network. 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. 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? - --------------------------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 iQIVAwUBW1F1W2aOgq3Tt24GAQhNnA//YmpPbEHkeFF7XCspC67nzIZuTXQQPAcC MW+6p/rBt8AzEHGbNWJtk35suqPnMEUT7hRZVUJOIbvEvRF4yBY7O/MFNiz7sd6k jig9CGGZYnURpqWSfwbz9APQSi4li6PLz3Sbm56/g+TV/DcZafeIPU3AKiG4ksmO OnBedYcRSc8DTVWMKNaeeb6EpVjaczVvq5GI+SVp/wolMBC8ZvHh68IDjEACBsWX mNq66wUXptxm7YUjnNdvWRWQkkH5SmKW4zSx7aoVcpkP/m3M0SECaf3c/w3s8no5 2wzolqTBxkqxIm+qWfQ7UJ8ZGIVSYdH8im0Tg7d3xI84mLVnSD3n5eJ2Q3O+jDjL p6GuhjNuHu+NCSyBRJZHtXOPEF0XXyLx45WNrjq+Iknzjgkynbu33J3knrCf0Z4Y y+lOg5PyF37MIDdqF6c/qjK5JId8PMfnQfQ0dP0tHk4vheXrWLuKqGjgyhOJNerf ohOCH8sLA/DWNngpcG8yxX053eClEIyqu7LRxMM0WZIjMmkEwPNbG1MheTBtEW7x e5SVTsyhx5sjvnIHaSHpPLscREvAia1o/6lxkCEp6wq4wzEBASl6i3VfncUSib0s A9XciIuEdY3mBAV/k8gKnyEiwE+7jSxVjBOpQuhUmGCYZ1e2QUBGVImcxKPubG5Z VEsxCVC3xs8= =lnRr -----END PGP SIGNATURE-----