10 October 2016
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2356 GE Bently Nevada 3500/22M Improper Authorization Vulnerability 10 October 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: GE Bently Nevada 3500/22M Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2016-5788 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-16-252-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-252-01) GE Bently Nevada 3500/22M Improper Authorization Vulnerability Original release date: October 06, 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 This advisory was originally posted to the US-CERT secure Portal library on September 8, 2016, and is being released to the NCCIC/ICS-CERT web site. GE has identified an improper authorization vulnerability in the GE Bently Nevada 3500/22M monitoring system. GE has produced a new firmware version to mitigate this vulnerability in the USB version of the GE Bently Nevada 3500/22M monitoring system. This vulnerability could be exploited remotely. AFFECTED PRODUCT The following GE Bently Nevada 3500/22M firmware versions are affected: - - GE Bently Nevada 3500/22M (USB version), all versions prior to firmware Version 5.0, and - - GE Bently Nevada 3500/22M (serial version), all versions. IMPACT Successful exploitation of the identified vulnerability may allow a remote attacker to gain unauthorized access to the affected device with elevated privileges. 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 GE Bently Nevada is a wholly owned subsidiary of GE, a US-based company that maintains offices in several countries around the world. The affected product, GE Bently Nevada 3500/22M, is a vibration monitoring system. According to GE, the GE Bently Nevada 3500/22M is deployed across several sectors including Chemical and Energy. GE estimates that these products are used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW IMPROPER AUTHORIZATION [a] Several open ports have been identified on the affected device, which allow unauthorized access to the device with elevated privileges. CVE-2016-5788 [b] has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/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 An attacker with a low skill would be able to exploit this vulnerability. MITIGATION GE has released a new firmware version for the GE Bently Nevada 3500/22M TDI USB monitoring system, Version 5.0. GEs new firmware can only be applied to the USB version of the GE Bently Nevada 3500/22M monitoring system. Users registered with a GE Bently Nevada Technical Support Agreement can download Version 5.0 and access GEs Technical Information Letter (TIL-149700250) detailing further mitigation strategies at the following URL with a valid account: http://www.bntechsupport.com (link is external) GE recommends that users using the serial version of the GE Bently Nevada 3500/22M upgrade the affected device. Users who are concerned about the security of their GE Bently Nevada 3500 System should: - - Employ system hardening techniques for GE Bently Nevadas 3500 System as outlined in document 106M9733 - 3500 Hardening Guideline. This document is available through www.bntechsupport.com (link is external). - - Contact GE Bently Nevada for information regarding installations compliant to IEC 62443-2-4 Level 1. - - Implement a bump-in-the-wire solution to provide secure communication between endpoints, which may enhance security. - - Effectively segment networks and implement demilitarized zones (DMZs) with properly configured firewalls to selectively control and monitor traffic passed between zones. ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 ICSCERT 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-285: Improper Authorization, http://cwe.mitre.org/data/definitions/285.html, web site last accessed October 06, 2016. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5788, 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 October 06, 2016. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: firstname.lastname@example.org (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 email@example.com 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: firstname.lastname@example.org 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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