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AUSCERT External Security Bulletin Redistribution
ESB-2018.0476
Nortek Linear eMerge E3 Series
16 February 2018
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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
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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?
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