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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.0564 Schneider Electric Building Operation Automation Server Vulnerability 3 March 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Schneider Electric Building Operation Automation Server Publisher: US-CERT Operating System: Linux variants Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2016-2278 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-16-061-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-061-01) Schneider Electric Building Operation Automation Server Vulnerability Original release date: March 01, 2016 | Last revised: March 02, 2016 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/. OVERVIEW Independent researcher Karn Ganeshen has identified a vulnerability in servers programmed with Schneider Electrics StruxureWare Building Operation software. Schneider Electric has produced a new version to mitigate this vulnerability. This vulnerability could be exploited remotely. AFFECTED PRODUCTS Schneider Electric reports that the vulnerability affects the following products from the StruxureWare Building Operations line: Automation Server, V1.7.0 and prior. IMPACT A malicious authenticated user could exploit this vulnerability to circumvent the Linux operating system's user access controls. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. BACKGROUND Schneider Electrics corporate headquarters is located in Paris, France, and it maintains offices in more than 100 countries worldwide. The affected product, Automation Server, is a building automation system for small and medium-sized buildings. According to Schneider Electric, Automation Server is deployed in the Commercial Facilities sector. Schneider Electric estimates that this product is used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW OS COMMAND INJECTION[a] Some functions can allow administrative users to circumvent the Linux operating system's user access controls. CVE-2016-2278[b] has been assigned to this vulnerability. A CVSS v3 base score of 7.2 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).[c] VULNERABILITY DETAILS EXPLOITABILITY This vulnerability could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target this vulnerability. DIFFICULTY A malicious authenticated user with a low skill would be able to exploit this vulnerability. MITIGATION Schneider Electric has released a new version of Automation Server firmware which remediates this vulnerability. The user is no longer allowed to operate the system with default credentials and the minimal msh shell can no longer be circumvented. Users should contact their authorized Schneider Electric service channel to access the firmware update. For more information, please see Schneider Electrics Security Notification number SEVD-2016-025-01 at the following location on their web site: http://www.schneider-electric.com/ww/en/download/document/SEVD-2016-025-01 (link is external) ICS-CERT recommends that 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. 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 at: http://ics-cert.us-cert.gov/content/recommended-practices. 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 (http://ics-cert.us-cert.gov/). 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-78: Improper Neutralization of Special Elements used in an OS Command (OS Command Injection), http://cwe.mitre.org/data/definitions/78.html, web site last accessed March 01, 2016 b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-2278, 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:H/UI:N/S..., web site last accessed March 01, 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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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). 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