ESB-2018.0476 - ALERT [Appliance] Nortek Linear eMerge E3 Series: Administrator compromise - Remote/unauthenticated 2018-02-16

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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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