ESB-2017.2955 - [Appliance] Moxa NPort : Multiple vulnerabilities 2017-11-17

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2955
        Multiple vulnerabilities have been identified in Moxa NPort
                           5110, 5130, and 5150
                             17 November 2017

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

Product:           Moxa NPort
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-16719 CVE-2017-16715 CVE-2017-14028

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-320-01

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Advisory (ICSA-17-320-01)

Moxa NPort 5110, 5130, and 5150

Original release date: November 16, 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 8.6

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Moxa

Equipment: NPort 5110, 5130, 5150

Vulnerabilities: Injection, Information Exposure, Resource Exhaustion

AFFECTED PRODUCTS

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

NPort 5110 Version 2.2,

NPort 5110 Version 2.4,

NPort 5110 Version 2.6,

NPort 5110 Version 2.7,

NPort 5130 Version 3.7 and prior, and

NPort 5150 Version 3.7 and prior.

IMPACT

Successful exploitation of these vulnerabilities could allow for remote code 
execution on the device.

MITIGATION

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

NPort 5110 https://www.moxa.com/support/download.aspx?type=support&id=882 
(link is external)

NPort 5130 and NPort 5150 
https://www.moxa.com/support/download.aspx?type=support&id=356 (link is 
external)

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

VULNERABILITY OVERVIEW

IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS IN OUTPUT USED BY A DOWNSTREAM 
COMPONENT ('INJECTION') CWE-74

An attacker may be able to inject packets that could potentially disrupt the 
availability of the device.

CVE-2017-16719 has been assigned to this vulnerability. A CVSS v3 base score 
of 7.5 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

INFORMATION EXPOSURE CWE-200

An attacker may be able to exploit a flaw in the handling of Ethernet frame 
padding that may allow for information exposure.

CVE-2017-16715 has been assigned to this vulnerability. A CVSS v3 base score 
of 8.6 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L).

UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400

An attacker may be able to exhaust memory resources by sending a large amount
of TCP SYN packets.

CVE-2017-14028 has been assigned to this vulnerability. A CVSS v3 base score 
of 7.5 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

RESEARCHER

Florian Adamsky reported the vulnerabilities to ICS-CERT and tested the new 
firmware.

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 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

ICS-CERT 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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