11 June 2015
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1508 N-Tron 702W Hard-Coded SSH and HTTPS Encryption Keys 11 June 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: N-Tron 702W Publisher: US-CERT Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2012-4716 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-15-160-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-15-160-01) N-Tron 702W Hard-Coded SSH and HTTPS Encryption Keys Original release date: June 09, 2015 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 Neil Smith of (ZeroFox) Riskive Security has identified hard-coded SSH and HTTPS encryption keys in N-Trons 702-W Industrial Wireless Access Point device. This vulnerability could allow an attacker to compromise communications and compromise the integrity of the device. N-Tron has been notified of this reported vulnerability, and NCCIC/ICSCERT has not been able to successfully coordinate this issue with N-Tron or Red Lion because of the vendors unresponsiveness. ICS-CERT is unaware of any fix, patch, or update by N-Tron that mitigates this vulnerability. This advisory is being published to inform critical infrastructure asset owners of the risk of using this equipment and for them to increase compensating measures if possible. This vulnerability can be exploited remotely. AFFECTED PRODUCTS The following N-Tron products are affected: N-Tron 702-W Industrial Wireless Access Point, all versions. IMPACT The SSH and HTTPS private keys for secure communication can be copied from the device and the keys are the same on each device. Users do not have the ability to generate a new private key. These keys can be used to intercept communications from these devices to completely compromise the confidentiality and integrity of the transmitted data. Impact to individual organizations depends on many factors that are unique to each organization. ICSCERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. BACKGROUND Spectris plc is a United Kingdom-based instrumentation and controls company that acquired NTron on October 1, 2010, and is aligned closely with its Red Lion Controls subsidiary. In February 2013, Red Lion, Sixnet, and N-Tron were fully combined under the Red Lion Brand. N-Tron is a US-based company that maintains corporate offices in Mobile, Alabama, with representatives around the world, including Canada, China, India, Switzerland, and the United Kingdom. According to the N-Tron web site, products are deployed across several sectors including Commercial Facilities; Energy; Nuclear Reactors, Materials, and Waste; Transportation Systems; and Water and Wastewater System, as well as other miscellaneous process control applications. N-Tron estimates that these products are distributed in over 50 countries worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW HARD-CODED CRYPTOGRAPHIC KEYS [a] The SSH and HTTPS private keys used for secure traffic communication are hard-coded on the device and are not unique. An attacker can use these keys from one device to decrypt traffic from any other device. Users do not have the ability to generate new keys for the device. An attacker has the ability to use the key to completely compromise the confidentiality and integrity of the wireless traffic. CVE-2012-4716 [b] has been assigned to this vulnerability. A CVSS v2 base score of 8.8 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:C/I:C/A:N). [c] VULNERABILITY DETAILS EXPLOITABILITY This vulnerability can be exploited remotely as the keys can be pulled from firmware available from N-Tron. 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 ICS-CERT recommends users contact N-Tron customer support with further questions and for mitigation strategies. 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 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-321: Use of Hard-coded Cryptographic Key, http://cwe.mitre.org/data/definitions/321.html, web site last accessed June 09, 2015. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-4716, 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:N, web site last accessed June 09, 2015. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: firstname.lastname@example.org 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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