ESB-2018.0139 - [Appliance] Moxa MXview: Increased privileges - Existing account 2018-01-12

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0139
                   Advisory (ICSA-18-011-02) Moxa MXview
                              12 January 2018

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

Product:           Moxa MXview
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-14030  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-011-02

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Advisory (ICSA-18-011-02)

Moxa MXview

Original release date: January 11, 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 7.8

ATTENTION: Low skill level to exploit.

Vendor: Moxa

Equipment: MXview

Vulnerability: Unquoted Search Path or Element.

AFFECTED PRODUCTS

The following versions of MXview, network management software, are affected:

  o MXview v2.8 and prior.

IMPACT

Successful exploitation of this vulnerability could allow a local authorized
user with file access to escalate privileges by inserting arbitrary code into
the unquoted service path.

MITIGATION

Moxa has produced new firmware Version 2.9 for the affected devices that can be
downloaded from:

https://www.moxa.com/support/sarch_result.aspx?prod_id=622&type_id=6&type=soft

NCCIC/ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of this vulnerability. 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.

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. This
vulnerability is not remotely exploitable.

VULNERABILITY OVERVIEW

UNQUOTED SEARCH PATH OR ELEMENT CWE-428

The unquoted service path escalation vulnerability could allow an authorized
user with file access to escalate privileges by inserting arbitrary code into
the unquoted service path.

CVE-2017-14030 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H
/I:H/A:H).

RESEARCHER

Karn Ganeshen reported the vulnerability to ICS-CERT.

BACKGROUND

Critical Infrastructure Sectors: Critical Manufacturing, Energy, 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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