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AUSCERT External Security Bulletin Redistribution
ESB-2023.0271.2
Advisory (icsa-23-017-02) Mitsubishi Electric MELSEC iQ-F, iQ-R Series
27 January 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric MELSEC iQ-F, iQ-R Series
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-40267
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-23-017-02
Comment: CVSS (Max): 5.9 CVE-2022-40267 (CVSS:3.0/AV:N/AC:H/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:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Revision History: January 27 2023: Vendor Update
January 18 2023: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-23-017-02)
Mitsubishi Electric MELSEC iQ-F, iQ-R Series (Update A)
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 5.9
o ATTENTION: Exploitable remotely
o Vendor: Mitsubishi Electric
o Equipment: MELSEC iQ-F and iQ-R Series products
o Vulnerability: Predictable Seed in Pseudo-Random Number Generator (PRNG)
2. UPDATE OR REPOSTED INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-23-017-02 Mitsubishi Electric MELSEC iQ-F, iQ-R Series that was published
January 17, 2023, on the ICS webpage on cisa.gov/ICS.
3. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to access
the WEB server function by guessing the random numbers used for authentication.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following Mitsubishi Electric MELSEC products are affected:
o MELSEC iQ-F Series with serial number 17X**** or later:
FX5U-xMy/z x=32,64,80, y=T,R, z=ES,DS,ESS,DSS: Versions 1.280 and prior
FX5UC-xMy/z x=32,64,96 y=T, z=D,DSS: Versions 1.280 and prior
o MELSEC iQ-F Series with serial number 179**** and prior:
FX5U-xMy/z x=32,64,80, y=T,R, z=ES,DS,ESS,DSS: Versions 1.074 and prior
FX5UC-xMy/z x=32,64,96 y=T, z=D,DSS: Versions 1.074 and prior
o MELSEC iQ-F Series FX5UC-32MT/DS-TS, FX5UC-32MT/DSS-TS, FX5UC-32MR/DS-TS:
Versions 1.280 and prior
- --------- Begin Update A part 1 of 4 ---------
o FX5UJ-xMy/z x=24,40,60, y=T,R, z=ES,ESS: Versions 1.042 and prior
o FX5UJ-xMy/ES-A* x=24,40,60, y=T,R: Versions 1.043 and prior
o FX5S-xMy/z* x=30,40,60,80, y=T,R, z=ES,ESS: Versions 1.003 and prior
- --------- End Update A part 1 of 4 ---------
o MELSEC iQ-R Series R00/01/02CPU: All versions
o MELSEC iQ-R Series R04/08/16/32/120(EN)CPU: All versions
- --------- Begin Update A part 2 of 4 ---------
Note: These products are available in limited regions.
- --------- End Update A part 2 of 4 ---------
4.2 VULNERABILITY OVERVIEW
- --------- Begin Update A part 3 of 4 ---------
4.2.1 PREDICTABLE SEED IN PSEUDO-RANDOM NUMBER GENERATOR (PRNG) CWE-337
Mitsubishi Electric MELSEC iQ-F and iQ-R Series products both contain an
authentication bypass vulnerability in the WEB server function due to
predictable seed in the pseudo-random number generator.
CVE-2022-40267 has been assigned to this vulnerability. A CVSS v3 base score of
5.9 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/
C:N/I:H/A:N ).
- --------- End Update A part 3 of 4 ---------
4.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
4.4 RESEARCHER
Matt Wiseman of Cisco Talos reported this vulnerability to Mitsubishi Electric.
5. MITIGATIONS
Mitsubishi Electric has fixed the following products and recommends users apply
the latest firmware update to the follow products:
o MELSEC iQ-F Series with serial number 17X**** or later:
FX5U-xMy/z x=32,64,80, y=T,R, z=ES,DS,ESS,DSS: Update to v1.281 or
later
FX5UC-xMy/z x=32,64,96 y=T, z=D,DSS: Update to v1.281 or later
o MELSEC iQ-F Series with serial number 179**** and prior:
FX5U-xMy/z x=32,64,80, y=T,R, z=ES,DS,ESS,DSS: Update to v1.075 or
later
FX5UC-xMy/z x=32,64,96 y=T, z=D,DSS: Update to v1.075 or later
o MELSEC iQ-F Series FX5UC-32MT/DS-TS, FX5UC-32MT/DSS-TS, FX5UC-32MR/DS-TS:
Update to v1.281 or later
- --------- Begin Update A part 4 of 4 ---------
o FX5UJ-xMy/z x=24,40,60, y=T,R, z=ES,ESS: Update to v1.044 or later
o FX5UJ-xMy/ES-A* x=24,40,60, y=T,R: Update to v1.045 or later
o FX5S-xMy/z* x=30,40,60,80, y=T,R, z=ES,ESS: Update to v1.004 or later
Note: These products are available in limited regions. For how to get the fixed
version, users should contact Mitsubishi Electric.
- --------- End Update A part 4 of 4 ---------
Refer to the following product manual for updating the firmware:
"5 FIRMWARE UPDATE FUNCTION" in the MELSEC iQ-F FX5 User's Manual (Application)
Mitsubishi Electric recommends users take the following mitigation measures to
minimize the risk of exploiting this vulnerability:
o Use a firewall or virtual private network (VPN), etc. to prevent
unauthorized access when internet access is required.
o Use products inside a local area network (LAN) and block access from
untrusted networks and hosts through firewalls.
o Use the IP filter function* to block access from untrusted hosts. For
details on the IP filter function, refer to the manuals for each product:
"12.1 IP Filter Function" in the MELSEC iQ-F FX5 User's Manual
(Ethernet Communication)
"1.13 Security" - "IP filter" in the MELSEC iQ-R Ethernet User's Manual
(Application)
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. This
vulnerability has a high attack complexity.
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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