ESB-2018.2116 - [Appliance] Moxa NPort products: Denial of service - Remote/unauthenticated 2018-07-20

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2116
           Advisory (ICSA-18-200-04): Moxa NPort 5210 5230 5232
                               20 July 2018

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

Product:           Moxa NPort products
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10632  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-200-04

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Advisory (ICSA-18-200-04)
Moxa NPort 5210 5230 5232
Original release date: July 19, 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/.

1. EXECUTIVE SUMMARY

CVSS v3 7.5
ATTENTION: Exploitable remotely/low skill level to exploit
Vendor: Moxa
Equipment: NPort 5210, 5230, 5232
Vulnerability: Resource Exhaustion

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow a remote attacker
to send TCP SYN packages, causing a resource exhaustion condition that
would cause the device to become unavailable.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

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

NPort 5210, 5230, and 5232 Versions 2.9 build 17030709 and prior.

3.2 VULNERABILITY OVERVIEW

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

The amount of resources requested by a malicious actor are not restricted,
allowing for a denial-of-service condition.

CVE-2018-10632 has been assigned to this vulnerability. A CVSS v3
base score of 7.5 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, and
Transportation Systems
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: Taiwan

3.4 RESEARCHER

Mikael Vingaard reported this vulnerability to NCCIC.

4. MITIGATIONS

Moxa recommends that users upgrade to the latest firmware version, which
can be found at:

https://www.moxa.com/support/download.aspx?type=support&id=904

NCCIC recommends 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.

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 on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies.

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.

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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