ESB-2017.1977 - [Win][Appliance] Moxa SoftNVR-IA Live Viewer: Execute arbitrary code/commands - Existing account 2017-08-10

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1977
          Advisory (ICSA-17-220-02): Moxa SoftNVR-IA Live Viewer
                              10 August 2017

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

Product:           Moxa SoftNVR-IA Live Viewer
Publisher:         ICS-CERT
Operating System:  Network Appliance
                   Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-5170  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-220-02

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Advisory (ICSA-17-220-02)
Moxa SoftNVR-IA Live Viewer
Original release date: August 08, 2017

All information products included in http://ics-cert.us-cert.gov are provided
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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 7.2

Vendor: Moxa

Equipment: SoftNVR-IA Live Viewer

Vulnerability: Uncontrolled Search Path Element

AFFECTED PRODUCTS

The following versions of SoftNVR-IA Live Viewer, a video surveillance
software designed for industrial automation systems, are affected:

SoftNVR-IA Live Viewer, Version 3.30.3122 and prior versions.

IMPACT

Successful exploitation of this vulnerability may allow an attacker to
execute code from a malicious DLL on the affected system with the same
privileges as the application that loaded the malicious DLL.

MITIGATION

Moxa has provided software update Version 3.4 for SoftNVR-IA Live Viewer
which fixes this vulnerability. Moxa recommends users update to the new
version, which is available at the following location:

https://www.moxa.com/support/download.aspx?type=support&id=11320 (link
is external)

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.

In addition, ICS-CERT recommends that users take the following measures
to protect themselves from social engineering attacks:

Do not click web links or open unsolicited attachments in email messages.
Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.

Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.

No known public exploits specifically target this vulnerability. This
vulnerability is not remotely exploitable. High skill level is needed
to exploit.

VULNERABILITY OVERVIEW

UNCONTROLLED SEARCH PATH ELEMENT CWE-427

An uncontrolled search path element (DLL Hijacking) vulnerability has
been identified.

To exploit this vulnerability, an attacker could rename a malicious DLL
to meet the criteria of the application, and the application would not
verify that the DLL is correct. The attacker needs to have administrative
access to the default install location in order to plant the insecure
DLL. Once loaded by the application, the DLL could run malicious code at
the privilege level of the application.

CVE-2017-5170 has been assigned to this vulnerability. A CVSS v3
base score of 7.2 has been assigned; the CVSS vector string is
(AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H).

RESEARCHER

Independent security researcher Karn Ganeshen identified this vulnerability.

BACKGROUND

Critical Infrastructure Sector(s): 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 ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900

For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov

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