Mitsubishi Electric FA Engineering Software Products

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1. EXECUTIVE SUMMARY

• CVSS v3 5.3
• Vendor: Mitsubishi Electric
• Equipment: MELIPC , MELSEC iQ-R, and MELSEC Q Series
• Vulnerabilities: Processor Optimization Removal or Modification of Security-Critical Code, Observable Discrepancy

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow a malicious attacker to disclose information in the affected products.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Mitsubishi Electric reports the following versions of FA Engineering Software Products are affected. For the correspondence table of the affected products and each vulnerability, refer to Mitsubishi Electric's security bulletin.

• MELIPC MI5122-VW: All Versions
• MELIPC MI2012-W: All Versions
• MELIPC MI1002-W: All Versions
• MELIPC MI3321G-W: All Versions
• MELIPC MI3315G-W: All Versions
• MELSEC iQ-R R102WCPU-W: All Versions
• MELSEC Q Q24DHCCPU-V: All Versions
• MELSEC Q Q24DHCCPU-VG: All Versions
• MELSEC Q Q24DHCCPU-LS: All Versions
• MELSEC Q Q26DHCCPU-LS: All Versions

3.2 Vulnerability Overview

3.2.1 PROCESSOR OPTIMIZATION REMOVAL OR MODIFICATION OF SECURITY-CRITICAL CODE CWE-1037

The affected product is vulnerable to processor optimization removal or modification of security critical code, which may allow a malicious attacker to disclose information in the affected products.

CVE-2022-21151 has been assigned to this vulnerability. A CVSS v3.1 base score of 5.3 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N).

3.2.2 OBSERVABLE DISCREPANCY CWE-203

The affected product is vulnerable to an observable discrepancy, which may allow a malicious attacker to disclose information in the affected products.

CVE-2021-33149 has been assigned to this vulnerability. A CVSS v3.1 base score of 2.5 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N).

3.3 BACKGROUND

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

3.4 RESEARCHER

Mitsubishi Electric reported these vulnerabilities to CISA.

4. MITIGATIONS

Mitsubishi Electric recommends that users take the following mitigation measures to minimize the risk of exploiting these vulnerabilities:

• Restrict physical access to the product by unauthorized users.

Please contact your local Mitsubishi Electric representative for further questions.

For additional information see Mitsubishi Electric advisory 2023-017.

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:

• Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the Internet.
• Locate control system networks and remote devices behind firewalls and isolating them from business networks.
• When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.

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.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

• Do not click web links or open attachments in unsolicited email messages.
• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time. These vulnerabilities are not exploitable remotely. These vulnerabilities have a high attack complexity.

5. UPDATE HISTORY

• December 7, 2023: Initial Publication

• Mitsubishi Electric