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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2610 Schneider Electric Magelis HMI Resource Consumption Vulnerabilities 4 November 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Schneider Electric Magelis HMI Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2016-8374 CVE-2016-8367 Original Bulletin: http://ics-cert.us-cert.gov/advisories/ICSA-16-308-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-308-02) Schneider Electric Magelis HMI Resource Consumption Vulnerabilities Original release date: November 03, 2016 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/. OVERVIEW NCCIC/ICS-CERT is aware of a public report of resource consumption vulnerabilities affecting Schneider Electric's Magelis human-machine interface (HMI) products. The researcher Eran Goldstein, in collaboration with Check Point Software Technologies and CRITIFENCE, released vulnerability information after coordination with the vendor and ICS-CERT. Schneider Electric has validated the resource consumption vulnerabilities and is planning to release new versions to mitigate these vulnerabilities. These vulnerabilities could be exploited remotely. Detailed vulnerability information is publicly available that could be used to develop an exploit that targets these vulnerabilities. AFFECTED PRODUCTS Schneider Electric reports that the vulnerabilities affect the following versions of Magelis HMI: Magelis GTO Advanced Optimum Panels, all versions, Magelis GTU Universal Panel, all versions, Magelis STO5xx and STU Small panels, all versions, Magelis XBT GH Advanced Hand-held Panels, all versions, Magelis XBT GK Advanced Touchscreen Panels with Keyboard, all versions, Magelis XBT GT Advanced Touchscreen Panels, all versions, and Magelis XBT GTW Advanced Open Touchscreen Panels (Windows XPe). IMPACT Successful exploitation of these vulnerabilities could result in a denial of service for the affected devices. Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation. BACKGROUND Schneider Electric's corporate headquarters is located in Paris, France, and maintains offices in more than 100 countries worldwide. The affected products, Magelis, are human-machine interfaces. According to Schneider Electric, the Magelis HMIs are deployed across several sectors including Critical Manufacturing, and Food and Agriculture. Schneider Electric estimates that these products are used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW UNCONTROLLED RESOURCE CONSUMPTION [a] An attacker can open multiple connections to a targeted web server and keep connections open preventing new connections from being made, rendering the web server unavailable during an attack. CVE-2016-8367 [b] has been assigned to this vulnerability. Schneider Electric's CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). [c] UNCONTROLLED RESOURCE CONSUMPTION [d] An attacker may be able to disrupt a targeted web server, resulting in a denial of service. The disruption requires the affected device to be rebooted in order to regain operation. CVE-2016-8374 [e] has been assigned to this vulnerability. Schneider Electric's 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). [f] VULNERABILITY DETAILS EXPLOITABILITY These vulnerabilities could be exploited remotely. EXISTENCE OF EXPLOIT Detailed vulnerability information is publicly available that could be used to develop an exploit that targets these vulnerabilities. DIFFICULTY An attacker with low skill would be able to exploit these vulnerabilities. MITIGATION Schneider Electric is working to release new versions for the affected products that mitigate the identified vulnerabilities, which is planned for release by the end of March 2017. Schneider Electric recommends that users apply the following measures to minimize potential exposure: Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. Minimize potential attack surface by leaving the Web Gate Server set to its default disabled state if it is not needed. Place control system networks and devices behind firewalls, and isolate them from the business network. Limit traffic on the local network with managed switches. Where possible, avoid Wi-Fi capabilities; but when Wi-Fi is essential, use only secure communications (such as WPA2 encryption). Do not grant access to unknown computers. When remote access is essential, use secure methods, such as Virtual Private Networks (VPNs); and ensure the remote access solution(s), as well as the remote computer(s), are kept up-to-date with the latest security patches. For further information on vulnerabilities, please visit the Schneider Electric cybersecurity web page at: http://www.schneider-electric.com/en/download/document/SEVD-2016-302-01/ (link is external) ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. ICS-CERT 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 ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site. Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents. a. CWE-400: Uncontrolled Resource Consumption ('Resource Exhaustion'), https://cwe.mitre.org/data/definitions/400.html, web site last accessed November 3, 2016. b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8367, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. c. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed November 3, 2016. d. CWE-400: Uncontrolled Resource Consumption ('Resource Exhaustion'), https://cwe.mitre.org/data/definitions/400.html, web site last accessed November 3, 2016. e. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8374, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. f. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed November 3, 2016. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov (link sends e-mail) Toll Free: 1-877-776-7585 International Callers: (208) 526-0900 For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov ICS-CERT 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. 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