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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-18-200-04): Moxa NPort 5210 5230 5232
20 July 2018
AusCERT Security Bulletin Summary
Product: Moxa NPort products
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-10632
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Moxa NPort 5210 5230 5232
Original release date: July 19, 2018
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1. EXECUTIVE SUMMARY
CVSS v3 7.5
ATTENTION: Exploitable remotely/low skill level to exploit
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
CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, and
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: Taiwan
Mikael Vingaard reported this vulnerability to NCCIC.
Moxa recommends that users upgrade to the latest firmware version, which
can be found at:
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
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.
For any questions related to this report, please contact the NCCIC at:
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information:
or incident reporting: https://ics-cert.us-cert.gov/Report-Incident?
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