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 2. News & Events
 3. Cybersecurity Advisories
 4. ICS Advisory

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ICS Advisory


MITSUBISHI ELECTRIC MELSEC IQ-F SERIES

Release Date
March 02, 2023
Alert Code
ICSA-23-061-01



1. EXECUTIVE SUMMARY

 * CVSS v3 7.5
 * ATTENTION: Exploitable remotely/low attack complexity 
 * Vendor: Mitsubishi Electric  
 * Equipment: MELSEC iQ-F Series 
 * Vulnerability: Plaintext Storage of a Password 


2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an unauthenticated
malicious actor to login to a file transfer protocol (FTP) server or web server
by obtaining plaintext credentials stored in project files. 


3. TECHNICAL DETAILS


3.1 AFFECTED PRODUCTS

The following Mitsubishi Electric MELSEC iQ-F products are affected: 

 * FX5U(C) CPU modules: All models, all versions 
 * FX5UJ CPU modules: All models, all versions 
 * FX5S CPU modules: All models, all versions 
 * FX5-ENET: All versions 
 * FX5-ENET/IP: All versions 


3.2 VULNERABILITY OVERVIEW

3.2.1 PLAINTEXT STORAGE OF A PASSWORD CWE-256(link is external) 

Mitsubishi Electric MELSEC iQ-F series products are vulnerable to an information
disclosure vulnerability due to the affected products storing passwords in
plaintext. 

CVE-2023-0457(link is external) 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:H/I:N/A:N(link is external)). 


3.3 BACKGROUND

 * CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
 * COUNTRIES/AREAS DEPLOYED: Worldwide 
 * COMPANY HEADQUARTERS LOCATION: Japan


3.4 RESEARCHER

JeongHoon Bae, YiJoon Jung, JinYoung Kim, HyeokJong Yun, and HeeA Go of HelloT
reported this vulnerability to Mitsubishi Electric. 


4. MITIGATIONS

Mitsubishi Electric recommends users take the following mitigation measures to
minimize the risk of a malicious actor exploiting this vulnerability: 

 * Encrypt the communication data or project files when sending and receiving or
   sharing these files. 
 * Use a firewall or virtual private network (VPN), etc. to prevent unauthorized
   access when internet access is required. 
 * Use product(s) within a local area network (LAN) and block access from
   untrusted networks and hosts using firewalls. 
 * Use the IP filter function to block access from untrusted hosts.  
   * For details regarding the IP filter function, users can refer to "12.1 IP
     Filter Function" in the MELSEC iQ-F FX5 User's Manual (Ethernet
     Communication). 
 * Restrict physical access to affected products. 

For specific update instructions and additional details, see the Mitsubishi
Electric advisory(link is external). 

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 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 is not exploitable remotely. 


RELATED ADVISORIES

Mar 02, 2023
ICS Advisory | ICSA-23-061-02


BAICELLS NOVA

Mar 02, 2023
ICS Advisory | ICSA-23-061-03


RITTAL CMC III ACCESS SYSTEMS

Feb 28, 2023
ICS Advisory | ICSA-23-059-02


HITACHI ENERGY GATEWAY STATION

Feb 28, 2023
ICS Advisory | ICSA-23-059-01


HITACHI ENERGY GATEWAY STATION

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