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AUSCERT External Security Bulletin Redistribution
ESB-2024.0962
ICS Advisory | ICSA-24-044-01 Mitsubishi Electric MELSEC
iQ-R Series Safety CPU
14 February 2024
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric MELSEC iQ-R Series
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-6815
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-24-044-01
Comment: CVSS (Max): 6.5 CVE-2023-6815 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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ICS Advisory (ICSA-24-044-01)
Mitsubishi Electric MELSEC iQ-R Series Safety CPU
Release Date
February 13, 2024
1. EXECUTIVE SUMMARY
o CVSS v3 6.5
o ATTENTION : Exploitable remotely/low attack complexity
o Vendor : Mitsubishi Electric
o Equipment : MELSEC iQ-R Series Safety CPU and SIL2 Process CPU Module
o Vulnerability : Incorrect Privilege Assignment
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a non-administrator
user to disclose the credentials (user ID and password) of a user with a lower
access level than themselves.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Mitsubishi Electric reports that the following MELSEC iQ-R Series products are
affected:
o MELSEC iQ-R Series Safety CPU R08SFCPU: All versions
o MELSEC iQ-R Series Safety CPU R16SFCPU: All versions
o MELSEC iQ-R Series Safety CPU R32SFCPU: All versions
o MELSEC iQ-R Series Safety CPU R120SFCPU: All versions
o MELSEC iQ-R Series SIL2 Process CPU R08PSFCPU: All versions
o MELSEC iQ-R Series SIL2 Process CPU R16PSFCPU: All versions
o MELSEC iQ-R Series SIL2 Process CPU R32PSFCPU: All versions
o MELSEC iQ-R Series SIL2 Process CPU R120PSFCPU: All versions
3.2 Vulnerability Overview
3.2.1 INCORRECT PRIVILEGE ASSIGNMENT CWE-266
Information disclosure vulnerability due to incorrect privilege assignment
exists in MELSEC iQ-R Series Safety CPU and SIL2 Process CPU modules. After a
remote attacker logs into the CPU module as a non-administrator user, the
attacker may disclose the credentials (user ID and password) of a user with a
lower access level than the attacker by sending a specially crafted packet.
CVE-2023-6815 has been assigned to this vulnerability. A CVSS v3.1 base score
of 6.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U
/C:H/I:N/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
3.4 RESEARCHER
Reid Wightman of Dragos Inc. reported this vulnerability to Mitsubishi
Electric.
4. MITIGATIONS
When MELSEC iQ-R Series Safety CPU versions 27 or later is used with GX Works3
versions 1.087R or later, this attack can be prevented by enabling
"communicating with only the enhanced version of vulnerability management of GX
Works3" when writing user information to the CPU module. Mitsubishi Electric
will implement the workaround in other products in the near future. Please
contact your local Mitsubishi Electric representative to update your CPU module
to the one listed above.
Mitsubishi Electric recommends that 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 within a LAN and block access from untrusted networks and hosts through
firewalls.
o Use IP filter function to block access from untrusted hosts. For details on
the IP filter function, please refer to the following manual for each
product. "1.13 Security" - "IP filter" in the MELSEC iQ-R Ethernet User's
Manual (Application).
o Restrict physical access to the affected product as well as to the personal
computers and the network devices that can communicate with it.
o Install antivirus software on your personal computer that can access the
affected product.
For specific update instructions and additional details, see Mitsubishi
Electric advisory 2023-021 .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. 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/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 .
CISA encourages organizations to implement recommended cybersecurity strategies
for proactive defense of ICS assets .
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 exploitation specifically targeting this vulnerability has been
reported to CISA at this time.
5. UPDATE HISTORY
o February 13, 2024: Initial Publication
This product is provided subject to this Notification and this Privacy & Use
policy.
Vendor
Mitsubishi Electric
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