16 February 2018
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0476 Nortek Linear eMerge E3 Series 16 February 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Nortek Linear eMerge E3 Series Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Administrator Compromise -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-5439 Reference: ASB-2017.0219 ASB-2017.0065 ASB-2017.0042 ESB-2017.1020 ESB-2017.1013 ESB-2017.1000 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-046-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-046-01) Nortek Linear eMerge E3 Series Original release date: February 15, 2018 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/. CVSS v3 9.8 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: Nortek Equipment: Linear eMerge E3 Series Vulnerability: Command Injection AFFECTED PRODUCTS The following Linear eMerge, an access control interface, versions are affected: o Linear eMerge E3 series Versions V0.32-07e and prior. IMPACT Successful exploitation of this vulnerability could allow a remote attacker to execute malicious code on the system with elevated privileges, allowing for full control of the server. MITIGATION Nortek recommends that affected users upgrade by following the process outlined on Page 47 of the E3 User Programming Guide. NCCIC recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. o Locate control system networks and remote devices behind firewalls, and isolate them from the business network. o 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. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC 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 NCCIC Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website. Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. VULNERABILITY OVERVIEW IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN A COMMAND ('COMMAND INJECTION') CWE-77 A remote attacker may be able to execute arbitrary code on a target machine with elevated privileges. CVE-2017-5439 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/ I:H/A:H). RESEARCHER Evgeny Ermakov and Sergey Gordeychik reported the vulnerability to NCCIC. BACKGROUND Critical Infrastructure Sector: Commercial Facilities Countries/Areas Deployed: Worldwide Company Headquarters Location: Italy Contact Information For any questions related to this report, please contact the NCCIC at: Email: NCCICCUSTOMERSERVICE@hq.dhs.gov Toll Free: 1-888-282-0870 For industrial control systems cybersecurity information: http://ics-cert.us-cert.gov or incident reporting: https://ics-cert.us-cert.gov/Report-Incident? - --------------------------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: https://www.auscert.org.au/bulletins/ =========================================================================== 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWoZLaox+lLeg9Ub1AQgemA//foANrwqVv88D0bt4RNYggYxkwUB8J2FY 7G14leFeQOmVwxkbXQXrTXSIld16rMcwTNppIjAeBEN4cobeVfsb/7KQs7WXNuIi 6kdQey8SZKBi94okOaeahgT6FkUIB12vfnZn0BQKMT3e8cCj9obJEMqyG4labAr3 v9IGaAeyHmyWDzEUjMjhoRMlIF8oxXgcJAzUIUBtxsATYeV4Tp0skju3RfzFH8Y8 fPigw5U4pOWOmcn0WmHDBDVc0ccXN/CvJlGodApsaF1KuU3dLKJFn4N0aA5RoGS0 4fWv/Ud8ooMh407SAxhE2rW7Qu/2RxT7MgWVpnRXp2rN1htYHtsgmmbhMch6jPUg PNoHnHmVVutA/R7GzjQE8bnSBb/2aieNzz01btRplT3/ciOMbQ98I9nMoBfWkosT aT0++uF7mCxVFlU9uYXbGfSDI1tq4u2mLFVYAqwpNPYJpmCltZevZtlSiIqGwZkj GJiPVIhUyyacgK1jweKpZJxvYFe7zMQYB4j/v0ZT9Fxaj6PQtBY3hMUojAucOrhL eOiJEgI9V9sAgBPjSwb7K3MEfKVpPf8PoR1zEQIjin6OmAMLu10MnQVMK21gR13V bclXWVXNGzX6Md8bl+8gSuiETt4qRy4O+ZcFDagLcWeKBpjiSYp/xfa8j+QQwWP9 NV4YUy8Ac7U= =CBUq -----END PGP SIGNATURE-----