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AUSCERT External Security Bulletin Redistribution
ESB-2023.0510
Advisory (icsa-23-026-05) Mitsubishi Electric MELFA SD/SQ
series and F-series Robot Controllers
27 January 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric MELFA SD/SQ series and F-series Robot Controllers
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-33323
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-23-026-05
Comment: CVSS (Max): 7.5 CVE-2022-33323 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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ICS Advisory (ICSA-23-026-05)
Mitsubishi Electric MELFA SD/SQ series and F-series Robot Controllers
Original release date: January 26, 2023
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 7.5
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Mitsubishi Electric Corporation
o Equipment: MELFA SD/SQ series and F-series Robot Controllers
o Vulnerability: Active Debug Code
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to gain
unauthorized access to a robot controller.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Mitsubishi Electric reports this vulnerability affects the following Robot
Controllers:
o MELFA SD/SQ Series: firmware version S7x and prior
o MELFA SD/SQ Series: firmware version R7x and prior
o MELFA F-Series: firmware version S7x and prior
o MELFA F-Series: firmware version R7x and prior
Note: The affected firmware version depends on the model name; see Mitsubishi
Electric's publication for the specific model names and controller types.
3.2 VULNERABILITY OVERVIEW
3.2.1 ACTIVE DEBUG CODE CWE-489
An authentication bypass vulnerability due to active debug code exists in
Mitsubishi Electric MELFA SD/SQ series and F-series controllers for industrial
robots. An attacker could gain unauthorized access to a robot controller by
performing an unauthorized telnet login.
CVE-2022-33323 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:H/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
3.4 RESEARCHER
Mitsubishi Electric reported this vulnerability to CISA.
4. MITIGATIONS
Mitsubishi Electric released new firmware versions to address the issue. The
fixed firmware version depends on the model name. Users should contact
Mitsubishi Electric to obtain the latest firmware version:
o MELFA SD/SQ Series: Update to firmware version S7y or later
o MELFA SD/SQ Series: Update to firmware version R7y or later
o MELFA F-Series: Update to firmware version S7y or later
o MELFA F-Series: Update to firmware version R7y or later
Mitsubishi Electric recommends users take the following mitigation measures to
minimize the risk of an attacker exploiting this vulnerability:
o Use a firewall or virtual private network (VPN), etc. to prevent
unauthorized access when internet access is required.
o Use affected products within a local area network (LAN) and block access
from untrusted networks and hosts through firewalls.
For specific update instructions and additional details, see the Mitsubishi
Electric advisory .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability these vulnerabilities. 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 business networks.
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 at cisa.gov/ics . Several CISA products detailing cyber
defense best 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 at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing suspected malicious activity should follow established
internal procedures and report 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
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