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This updated advisory is a follow-up to the original advisory titled ICSA-23-061-01 Mitsubishi Electric MELSEC iQ-F Series that was published March 02, 2023, on the ICS webpage on cisa.gov/ICS.
Successful exploitation of this vulnerability could allow an unauthenticated attacker to login to an FTP server or web server by obtaining plaintext credentials stored in project files.
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The following Mitsubishi Electric MELSEC products are affected:
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4.2.1 PLAINTEXT STORAGE OF A PASSWORD CWE-256
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Mitsubishi Electric MELSEC iQ-F, iQ-R, Q, and L series are vulnerable to an information disclosure vulnerability due to plaintext storage of a password.
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CVE-2023-0457 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).
JeongHoon Bae, YiJoon Jung, JinYoung Kim, HyeokJong Yun and HeeA Go of HelloT reported this vulnerability to Mitsubishi Electric.
Mitsubishi Electric recommends that customers take the following mitigation measures to minimize the risk of exploiting this vulnerability:
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For details on the IP filter function, please refer to the following manuals for each product;
β12.1 IP Filter Functionβ in the MELSEC iQ-F FX5 Userβs Manual (Ethernet Communication)
β1.13 Securityβ - βIP filterβ in the MELSEC iQ-R Ethernet Userβs Manual (Application).
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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. 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-12-146-01BβTargeted 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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-0457
cisa.gov/ics
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us-cert.cisa.gov/ics/Recommended-Practices
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