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AUSCERT External Security Bulletin Redistribution
ESB-2022.0079
Advisory (icsa-21-357-01) Moxa MGate Protocol Gateways
7 January 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Moxa MGate Protocol Gateways
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2021-4161
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-357-01
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ICS Advisory (ICSA-21-357-01)
Moxa MGate Protocol Gateways
Original release date: December 23, 2021
Legal Notice
All information products included in https://us-cert.cisa.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://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Moxa
o Equipment: MGate MB3180/MB3280/MB3480 Series Protocol Gateways
o Vulnerability: Cleartext Transmission of Sensitive Information
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow remote attackers to
obtain sensitive information.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following firmware versions of MGate MB3000 Series, a serial-to-Ethernet
Modbus gateway, are affected:
o MGate MB3180 Series: Firmware Version 2.2 or lower
o MGate MB3280 Series: Firmware Version 4.1 or lower
o MGate MB3480 Series: Firmware Version 3.2 or lower
3.2 VULNERABILITY OVERVIEW
3.2.1 CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319
The affected products contain vulnerable firmware, which could allow an
attacker to sniff the traffic and decrypt login credential details. This could
give an attacker admin rights through the HTTP web server.
CVE-2021-4161 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/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Taiwan
3.4 RESEARCHER
Parul Sindhwad, Anurag M. Chevendra, and Dr. Faruk Kazi of CoE-CNDS Lab; VJTI;
and Mumbai-INDIA reported this vulnerability to Moxa.
4. MITIGATIONS
Moxa has developed the following mitigations to address this vulnerability.
o Enable 'HTTPS' and disable the HTTP console function under 'Console
Settings'
Moxa also recommends users refer to Tech Note: Moxa Security Hardening Guide
for MGate MB3000 Series
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 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 VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its 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 cisa.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 cisa.gov 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 CISA 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 CISA at:
Email: CISAservicedesk@cisa.dhs.gov
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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