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AUSCERT External Security Bulletin Redistribution
ICS Advisory (ICSA-20-287-01) - MOXA NPort IAW5000A-I/O Series
14 October 2020
AusCERT Security Bulletin Summary
Product: MOXA NPort IAW5000A-I/O Series
Operating System: Network Appliance
Impact/Access: Increased Privileges -- Existing Account
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Unauthorised Access -- Remote with User Interaction
CVE Names: CVE-2020-25198 CVE-2020-25196 CVE-2020-25194
CVE-2020-25192 CVE-2020-25190 CVE-2020-25153
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ICS Advisory (ICSA-20-287-01)
MOXA NPort IAW5000A-I/O Series
Original release date: October 13, 2020
All information products included in https://us-cert.gov/ics 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 https://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: MOXA
o Equipment: NPort IAW5000A-I/O Series
o Vulnerabilities: Session Fixation, Improper Privilege Management, Weak
Password Requirements, Cleartext Transmission of Sensitive Information,
Improper Restriction of Excessive Authentication Attempts, Exposure of
Sensitive Information to an Unauthorized Actor
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
gain access to and hijack a session; allow an attacker with user privileges to
perform requests with administrative privileges; allow the use of weak
passwords; allow credentials of third-party services to be transmitted in
cleartext; allow the use of brute force to bypass authentication on an SSH/
Telnet session; or allow access to sensitive information without proper
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following software versions on NPort IAW5000A-I/O, an integrated serial
device server, are affected:
o NPort: Firmware Version 2.1 or lower
3.2 VULNERABILITY OVERVIEW
3.2.1 SESSION FIXATION CWE-384
The built-in WEB server has incorrectly implemented protections from session
fixation, which may allow an attacker to gain access to a session and hijack it
by stealing the user's cookies.
CVE-2020-25198 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/
3.2.2 IMPROPER PRIVILEGE MANAGEMENT CWE-269
The built-in WEB server has improper privilege management, which may allow an
attacker with user privileges to perform requests with administrative
CVE-2020-25194 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
3.2.3 WEAK PASSWORD REQUIREMENTS CWE-521
The built-in web service does not require users to have strong passwords.
CVE-2020-25153 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
3.2.4 CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319
The built-in web server stores and transmits the credentials of third-party
services in cleartext.
CVE-2020-25190 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/
3.2.5 IMPROPER RESTRICTION OF EXCESSIVE AUTHENTICATION ATTEMPTS CWE-307
The built-in web server allows SSH/Telnet sessions, which may be vulnerable to
brute force attacks to bypass authentication.
CVE-2020-25196 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
3.2.6 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR CWE-200
The built-in web service allows sensitive information to be displayed without
CVE-2020-25192 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Energy Sector
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Taiwan
Evgeniy Druzhinin and Ilya Karpov of Rostelecom-Solar reported these
vulnerabilities to CISA.
Moxa has released an updated firmware version for the NPort IAW5000A-I/O Series
and recommends users install this update on all affected systems.
CISA recommends 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.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . 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 webpage on us-cert.gov 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 CISA for tracking
and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
CISA 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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