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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-20-196-02) Moxa EDR-G902 and EDR-G903 Series Routers
15 July 2020
AusCERT Security Bulletin Summary
Product: Moxa EDR-G902 and EDR-G903 Series Routers
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
CVE Names: CVE-20209-14511
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ICS Advisory (ICSA-20-196-02)
Moxa EDR-G902 and EDR-G903 Series Routers
Original release date: July 14, 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: EDR-G902 and EDR-G903 Series Routers
o Vulnerability: Stack-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation of this vulnerability could crash the device being
accessed; a buffer overflow condition may allow remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Moxa Series routers are affected:
o EDR-G902 Series: firmware versions 5.4 and prior
o EDR-G903 Series: firmware versions 5.4 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
Malicious operation of the crafted web browser cookie may cause a stack-based
buffer overflow in the system web server.
CVE-20209-14511 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
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, and
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Taiwan
Tal Keren of Claroty reported this vulnerability to Moxa.
Moxa recommends users implement the following to mitigate the vulnerability:
o Install firmware patch. Patches may be downloaded from Moxa's security
advisory page .
Please see Moxa's security advisory for more information.
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 this vulnerability.
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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