Mitsubishi Electric MELSEC-Q/L Series (Update B)

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1. EXECUTIVE SUMMARY

• CVSS v3 9.8
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Mitsubishi Electric
• Equipment: MELSEC-Q/L Series
• Vulnerabilities: Incorrect Pointer Scaling, Integer Overflow or Wraparound

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow a remote attacker to be able to read arbitrary information or execute malicious code on a target product by sending a specially crafted packet.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Mitsubishi Electric MELSEC-Q/L Series, a controller used for factory automation, are affected:

• MELSEC-Q Series Q03UDECPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q04UDEHCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q06UDEHCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q10UDEHCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q13UDEHCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q20UDEHCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q26UDEHCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q50UDEHCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q100UDEHCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q03UDVCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q04UDVCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q06UDVCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q13UDVCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q26UDVCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q04UDPVCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q06UDPVCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q13UDPVCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-Q Series Q26UDPVCPU: The first 5 digits of serial No. "26061" and prior
• MELSEC-L Series L02CPU(-P): The first 5 digits of serial No. "26041" and prior
• MELSEC-L Series L06CPU(-P): The first 5 digits of serial No. "26041" and prior
• MELSEC-L Series L26CPU(-P): The first 5 digits of serial No. "26041" and prior
• MELSEC-L Series L26CPU-(P)BT: The first 5 digits of serial No. "26041" and prior

3.2 Vulnerability Overview

3.2.1 Incorrect Pointer Scaling CWE-468

In the Mitsubishi Electric MELSEC-Q/L Series a remote attacker may be able to read arbitrary information from a target product or execute malicious code on a target product by sending a specially crafted packet.

CVE-2024-0802 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.2.2 Integer Overflow or Wraparound CWE-190

In the Mitsubishi Electric MELSEC-Q/L Series a remote attacker may be able to execute malicious code on a target product by sending a specially crafted packet

CVE-2024-0803 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.2.3 Incorrect Pointer Scaling CWE-468

In the Mitsubishi Electric MELSEC-Q/L Series a remote attacker may be able to execute malicious code on a target product by sending a specially crafted packet

CVE-2024-1915 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.2.4 Integer Overflow or Wraparound CWE-190

In the Mitsubishi Electric MELSEC-Q/L Series a remote attacker may be able to execute malicious code on a target product by sending a specially crafted packet

CVE-2024-1916 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.2.5 Integer Overflow or Wraparound CWE-190

In the Mitsubishi Electric MELSEC-Q/L Series a remote attacker may be able to execute malicious code on a target product by sending a specially crafted packet

CVE-2024-1917 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

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

3.4 RESEARCHER

Anton Dorfman from Positive Technologies reported these vulnerabilities to Mitsubishi Electric.

4. MITIGATIONS

Mitsubishi Electric released the fixed version of the product:

• MELSEC-Q Series Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: firmware versions where the first 5 digits of serial No. "26062" or later
• MELSEC-Q Series Q03/04/06/13/26UDVCPU: firmware versions where the first 5 digits of serial No. "26062" or later
• MELSEC-Q Series Q04/06/13/26UDPVCPU: firmware versions where the first 5 digits of serial No. "26062" or later
• MELSEC-L Series L02/06/26CPU(-P), L26CPU-(P)BT: firmware versions where the first 5 digits of serial No. "26042" or later

Mitsubishi Electric recommends that users consider replacing with MELSEC iQ-R Series.

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

• Use a firewall, virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required.
• Use within a LAN and block access from untrusted networks and hosts through firewalls.
• Restrict physical access to the affected product as well as to the personal computers and the network devices that can communicate with it.
• Install antivirus software on your personal computer that can access the affected product.

For specific additional details, see Mitsubishi Electric advisory 2023-024.

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.

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 these vulnerabilities has been reported to CISA at this time.

5. UPDATE HISTORY

• March 14, 2024: Initial Publication
• May 16, 2024: Update A - Update to the affected products and mitigations
• June 13, 2024: Update B - Update to the affected products and mitigations

• Mitsubishi Electric