Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2022.0185
Advisory (icsa-22-013-07) Mitsubishi Electric MELSEC-F Series
14 January 2022
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric MELSEC-F Series
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20613
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-013-07
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-22-013-07)
Mitsubishi Electric MELSEC-F Series
Original release date: January 13, 2022
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
o Equipment: MELSEC-F Series
o Vulnerability: Improper Initialization
2. RISK EVALUATION
Successful exploitation of this vulnerability may cause a denial-of-service
condition in the affected product.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of MELSEC-F Series with FX3U-ENET, an Ethernet-Internet
block, are affected:
o FX3U-ENET: Firmware Version 1.16 and prior
o FX3U-ENET-L: Firmware Version 1.16 and prior
o FX3U-ENET-P502: Firmware Version 1.16 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INITIALIZATION CWE-665
An attacker could send a specially crafted packet that could create a
denial-of-service condition in the communication function of the product. A
system reset is required for recovery.
CVE-2021-20613 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:N/A:H ).
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 corrected this vulnerability in the following products and
versions, as follows:
o FX3U-ENET: Firmware Version 1.17 or later
o FX3U-ENET-L: Firmware Version 1.17 or later
o FX3U-ENET-P502: Firmware Version 1.17 or later
Mitsubishi Electric also recommends users take the following mitigation
measures to minimize the risk of exploiting this vulnerability:
o Use a firewall, VPN, or other barrier to prevent unauthorized access when
Internet access is required.
o Use within a LAN and block access from untrusted networks and hosts through
firewalls.
For specific update instructions and additional details see the Mitsubishi
Electric advisory .
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.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=LDDI
-----END PGP SIGNATURE-----