ESB-2018.0003 - [Appliance] Moxa NPort W2150A and W2250A: Root compromise - Remote/unauthenticated 2018-01-02

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0003
                       Moxa NPort W2150A and W2250A
                              2 January 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Moxa NPort W2150A and W2250A
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Root Compromise -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-16727  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-355-01

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Advisory (ICSA-17-355-01)

Moxa NPort W2150A and W2250A

Original release date: December 21, 2017

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 6.5

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Moxa

Equipment: NPort W2150A and W2250A

Vulnerability: Credentials Management

AFFECTED PRODUCTS

The following versions of NPort, a serial network interface, are affected:

    NPort W2150A Versions prior to 1.11, and
    NPort W2250A Versions prior to 1.11.

IMPACT

Successful exploitation of this vulnerability could allow unauthorized
access.

MITIGATION

Moxa has produced new firmware Version 2.1 for the affected devices that
can be downloaded from:

https://www.moxa.com/support/download.aspx?type=support&id=14781

NCCIC/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. 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 ICS-CERT 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.

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.

No known public exploits specifically target this vulnerability.

VULNERABILITY OVERVIEW

CREDENTIALS MANAGEMENT CWE-255

The default password is empty on the device. An unauthorized user can
access the device without a password. An unauthorized user has the ability
to completely compromise the confidentiality and integrity of the wireless
traffic.

CVE-2017-16727 has been assigned to this vulnerability. A CVSS
v3 base score of 6.5 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).

RESEARCHER

Federico Maggi reported the vulnerability to ICS-CERT.

BACKGROUND

Critical Infrastructure Sectors: Critical Manufacturing, Energy, and
Transportation Systems

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Taiwan

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?

The NCCIC continuously strives to improve its products and services. You
can help by choosing one of the links below to provide feedback about
this product.

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