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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.0088 ICS-CERT ADVISORY ICSA-13-016-01 - SCHNEIDER ELECTRIC AUTHENTICATED COMMUNICATION RISK VULNERABILITY 21 January 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Schneider Electric Software Update Publisher: US-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2013-0655 Original Bulletin: http://www.us-cert.gov/control_systems/pdf/ICSA-13-016-01.pdf - --------------------------BEGIN INCLUDED TEXT-------------------- ICS-CERT ADVISORY ICSA-13-016-01 - SCHNEIDER ELECTRIC AUTHENTICATED COMMUNICATION RISK VULNERABILITY January 16, 2013 OVERVIEW ICS-CERT has received a report from Schneider Electric concerning an Authenticated Communication Risk vulnerability in the Schneider Electric Software Update utility (SESU). This vulnerability was reported to Schneider Electric by security researcher Arthur Gervais. The SESU is a centralized update mechanism for updating Schneider Electric software on Windows PC. Schneider Electric has updated the SESU client as of January 2013, which adds the use of HTTPS to resolve this vulnerability. This vulnerability could be exploited remotely. AFFECTED PRODUCTS According to Schneider Electric, the following products and versions are affected by use of the SESU mechanism: * Unity Pro, V5.0 L, M, S, XL, * Unity Pro, V6.0 L, M, S, XL, * Unity Pro, V6.1 L, M, S, XL, * Unity Pro, V0 L, M, S, XL, XLS, * Vijeo Designer V6.0.x, V6.1.0.x, V5.0.0.x, V5.1.0.x, * Vijeo Designer Opti V6.0.x, V5.1.0.x, V5.0.0.x, * Web Gate Client Files V5.1.x, * IDS V1.0, V2.0, * PowerSuite 2.5, * Smart Widget Acti 9 V1.0.0.0, * Smart Widget H8035 V1.0.0.0, * Smart Widget H8036 V1.0.0.0, * Smart Widget PM201 V1.0.0.0, * Smart Widget PM710 V1.0.0.0, * Smart Widget PM750 V1.0.0.0, * SoMachine V1.2.1, * Spacail.pro V1.0.0.x, and * SESU V1.0.x, V1.1.x IMPACT Successfully exploiting this vulnerability could result in arbitrary code execution. Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. BACKGROUND Schneider Electric is a manufacturer and integrator of energy management equipment and software. According to Schneider Electric, their products are used in energy, industry, and building automation worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW AUTHENTICATED COMMUNICATIONS RISK [a] Schneider Electric software on the customer PC uses the SESU service as the mechanism of communication with the Schneider Electric central update server in order to receive periodic software updates. The SESU client on the customer PC does not check the authenticity of the origin. By redirecting messages to Port 80/TCP on an unauthorized source, an attacker could execute arbitrary code on a vulnerable system that could result in loss of availability, integrity, and confidentiality. CVE-2013-0655 [b] has been assigned to this vulnerability. A CVSS v2 base score of 9.3 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:C/I:C/A:C). [c] VULNERABILITY DETAILS EXPLOITABILITY This vulnerability could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits exist that target this vulnerability. DIFFICULTY An attacker with a medium skill level would be able to exploit this vulnerability. MITIGATION Schneider Electric has produced a customer notification [d] that contains mitigations to resolve this vulnerability. According to Schneider Electric, in order to resolve the vulnerability with the software server, Schneider Electric has taken the following actions: 1. The SESU server has been updated to the latest version. Currently, both HTTP and HTTPS are supported in parallel. HTTPS does ensure signed communication. 2. The new SESU client has been updated as of January 2013 to use HTTPS instead of HTTP. The new version of the SESU Client will be made available to customers for distribution via the SESU mechanism in January 2013. 3. Customers can also use an updated software product CD that will contain the updated SESU client, when the CD becomes available. Contact your local support desk for details. 4. While both HTTP and HTTPS SESU client functionality is supported currently, several months after starting to update the SESU clients (May 2013) the HTTP port of the SESU server will be disabled. This means that only HTTPS will be supportedduring SESU client updates from that time forward, which mitigates this current vulnerability. ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks. * Minimize network exposure for all control system devices. Critical devices should not directly face 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 VPN is only as secure as the connected devices. ICS-CERT also provides a section for control systems security recommended practices on the US-CERT Web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. [e] ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures. Additional mitigation guidance and recommended practices are publicly available in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01A - Targeted Cyber Intrusion Detection and Mitigation Strategies, [f] that is available for download from the ICS-CERT Web page (www.ics-cert.org) 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. ICS-CERT CONTACT For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov Toll Free: 1-877-776-7585 For industrial control systems security information and incident reporting: www.ics-cert.org ICS-CERT continuously strives to improve its products and services. You can help by answering a short series of questions about this product at the following URL: http. s://forms.us-cert.gov/ncsd-feedback/ DOCUMENT FAQ What is an ICS-CERT Advisory? An ICS-CERT Advisory is intended to provide awareness orsolicit feedback from critical infrastructure owners and operators concerningongoing cyber events or activity with the potential to impact critical infrastructure computing networks. When is vulnerability attribution provided to researchers? Attribution for vulnerability discovery is always provided to the vulnerability reporter unless the reporter notifies ICS-CERT that they wish to remain anonymous. ICS-CERT encourages researchers to coordinate vulnerability details before public release. The public release of vulnerability details prior to the development of proper mitigations may put industrial control systems and the public at avoidable risk. a. CWE-287: Improper Authentication, http://cwe.mitre.org/data/definitions/287.html, CWE-287, Improper Authentication, Web site last accessed January 16, 2013. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-0655, 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, http://nvd.nist.gov/cvss.cfm?version=2&vector=(AV:N/AC:M/Au:N/C:C/I:C/A:C), Web site last accessed January 16, 2013. d. Schneider Electric Customer Notification, http://www2.schneider-electric.com/corporate/en/support/cybersecurity/viewer-news.page?c_filepath=/templatedata/Content/News/data/en/local/cybersecurity/general_information/2013/01/20130109_advisory_of_vulnerability_affecting_schneider_electric_s_software_upda.xml, Web site last accessed January 16, 2012. e. CSSP Recommended Practices, http://www.us-cert.gov/control_systems/practices/Recommended_Practices.html, Web site last accessed January 16, 2013. f. Targeted Cyber Intrusion Detection and Mitigation Strategies, http://www.us-cert.gov/control_systems/pdf/ICS-TIP-12-146-01A.pdf, Web site last accessed January 16, 2013. - --------------------------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: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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 iQIVAwUBUPyzOe4yVqjM2NGpAQJLuhAArEZqLy5GcSxLv5Qa8eSs5LlgQ/JFPU0i f8n+cVkT5QQ6IjMYyIdrNuKZz/oGMq9akT4BOrCb9oshIjslyQEOXFPXHv3/QqwB 6Nw8mb1n5LEpTSmMbmJiTDezuTeH3QpDXR3ZWkx+1VdUsVKMLMm8Gq1lCGDcjsZR 4muJ1aaUC8QGBHIG9JphYpsXRHLAIcI4Uues2piio7gIFnkQiBga7lWw/vs6jdIG syleo0lUtNAo1pTIxmof4xZw4GuK7z6IomsmnwH8Z4w7LfHkRyYsWDfd2xvdcJrL IdxY4Nln9kj66IzAGOcA8q+LmBDD22y56LQ25WwkX2xYR5TiDGVGybSMPWMcsIlp IGWUJGcNIoYLxULVCDrAr3Yl45PfJ7wJtNeO17OSgZm9modzM9F2UZV4O8PEEu7y Uq/tAuPfKW40c4PAqxzJbAhUbkF/UnCIf+bbEUNfATKDDpQqvWUlNGzkTwDRJlP+ QgcGAohvQh3MiaC41gFtnUD7yptT9Lm+M6rXYYcBar++fsSIDnNwibcw4b0x5Thy +HCL6Yj8Q4P1clHTdTENY7nCNm4LDPJzWeoiV8J/uWlOPDBADh8Jv/q0+p7Na7z1 F5IvEXHvJEYjjaHFde4YFr5OFWwOE1dQRyJBGgRjPIpUy8rqO1TivUlJApIK2GeQ j5onBeaRvVQ= =9sCt -----END PGP SIGNATURE-----