Mitsubishi Electric FA Engineering Software Products (Update H)

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v4 8.7
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Mitsubishi Electric
• Equipment: FA Engineering Software Products
• Vulnerabilities: Heap-based Buffer Overflow, Improper Handling of Length Parameter Inconsistency

2. RISK EVALUATION

Successful exploitation of these vulnerabilities may cause a denial-of-service condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Mitsubishi Electric reports these vulnerabilities affect the following FA Engineering Software Products that communicate with MELSEC, FREQROL, or GOT products:

• CPU Module Logging Configuration Tool: Version 1.112R and prior
• CW Configurator: Version 1.011M and prior
• Data Transfer: Version 3.44W and prior
• EZSocket: Version 5.4 and prior
• FR Configurator: All versions
• FR Configurator SW3: All versions
• FR Configurator2: Version 1.24A and prior
• GT Designer3 Version1(GOT1000): Version 1.250L and prior
• GT Designer3 Version1(GOT2000): Version 1.250L and prior
• GT SoftGOT1000 Version3: Version 3.245F and prior
• GT SoftGOT2000 Version1: Version 1.250L and prior
• GX Configurator-DP: Version 7.14Q and prior
• GX Configurator-QP: All versions
• GX Developer: Version 8.506C and prior
• GX Explorer: All versions
• GX IEC Developer: All versions
• GX LogViewer: Version 1.115U and prior
• GX RemoteService-I: All versions
• GX Works2: Version 1.597X and prior
• GX Works3: Version 1.070Y and prior
• iQ Monozukuri ANDON (Data Transfer): Version 1.003D and prior
• iQ Monozukuri Process Remote Monitoring (Data Transfer): Version 1.002C and prior
• M_CommDTM-HART: All versions
• M_CommDTM-IO-Link: Version 1.03D and prior
• MELFA-Works: Version 4.4 and prior
• MELSEC WinCPU Setting Utility: All versions
• MELSOFT EM Software Development Kit (EM Configurator): Version 1.015R and prior
• MELSOFT Navigator: Version 2.74C and prior
• MH11 SettingTool Version2: Version 2.004E and prior
• MI Configurator: Version 1.004E and prior
• MT Works2: Version 1.167Z and prior
• MX Component: Version 5.001B and prior
• Network Interface Board CC IE Control utility: Version 1.29F and prior
• Network Interface Board CC IE Field Utility: Version 1.16S and prior
• Network Interface Board CC-Link Ver.2 Utility: Version 1.23Z and prior
• Network Interface Board MNETH utility: Version 34L and prior
• PX Developer: Version 1.53F and prior
• RT ToolBox2: Version 3.73B and prior
• RT ToolBox3: Version 1.82L and prior
• Setting/monitoring tools for the C Controller module (SW4PVC-CCPU): Version 4.12N and prior
• SLMP Data Collector: Version 1.04E and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 Heap-based Buffer Overflow CWE-122

A malicious attacker may cause a denial-of-service condition by spoofing MELSEC, GOT, or FREQROL, and returning crafted reply packets.

CVE-2021-20587 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for CVE-2021-20587. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.2 Improper Handling of Length Parameter Inconsistency CWE-130

A malicious attacker may cause a denial-of-service condition by spoofing MELSEC, GOT, or FREQROL, and returning crafted reply packets.

CVE-2021-20588 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for CVE-2021-20588. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

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

3.4 RESEARCHER

dliangfun reported these vulnerabilities to Mitsubishi Electric.

4. MITIGATIONS

Mitsubishi Electric has released updated versions for the following products to address these vulnerabilities. Download and install the updates from the Mitsubishi Electric download site.:

• CPU Module Logging Configuration Tool: Version 1.118X or later
• CW Configurator: Version 1.012N or later
• Data Transfer: Version 3.45X or later
• EZSocket: Version 5.5 or later
• FR Configurator2: Version 1.25B or later
• GT Designer3 Version1(GOT1000): Version 1.255R or later
• GT Designer3 Version1(GOT2000): Version 1.255R or later
• GT SoftGOT1000 Version3: Version 3.255R or later
• GT SoftGOT2000 Version1: Version 1.255R or later
• GX Configurator-DP: Version 7.15R or later
• GX Developer: Version 8.507D or later
• GX LogViewer: Version 1.118X or later
• GX Works2: Version 1.600A or later
• GX Works3: Version 1.072A or later
• iQ Monozukuri ANDON (Data Transfer): Version 1.004E or later
• iQ Monozukuri Process Remote Monitoring (Data Transfer): Version 1.005F or later
• M_CommDTM-IO-Link: Version 1.04E or later
• MELFA-Works: Version 4.5 or later
• MELSOFT EM Software Development Kit (EM Configurator): Version 1.020W or later
• MELSOFT Navigator: Version 2.78G or later
• MH11 SettingTool Version2: Version 2.005F or later
• MI Configurator: Version 1.005F or later
• MT Works2: Version 1.170C or later
• MX Component: Version 5.002C or later
• Network Interface Board CC IE Control utility: Version 1.30G or later
• Network Interface Board CC IE Field Utility: Version 1.17T or later
• Network Interface Board CC-Link Ver.2 Utility: Version 1.24A or later
• Network Interface Board MNETH utility: Version 35M or later
• PX Developer: Version 1.54G or later
• RT ToolBox2: Version 3.74C or later
• RT ToolBox3: Version 1.90U or later
• Setting/monitoring tools for the C Controller module (SW4PVC-CCPU): Version 4.13P or later
• SLMP Data Collector: Version 1.05F or later

Mitsubishi Electric has no plans to release fixed versions for the following products:

• FR Configurator
• FR Configurator SW3
• GX Configurator-QP
• GX Explorer
• GX IEC Developer
• GX RemoteService-I
• M_CommDTM-HART
• MELSEC WinCPU Setting Utility

For users of products that do not have a fixed version or who cannot immediately update the product, Mitsubishi Electric recommends taking the following mitigations to minimize the risk of exploiting these vulnerabilities:

• Install the fixed version of GX Works3 on your personal computer running the products when communicating with MELSEC. GX Works3 provides comprehensive countermeasures that provide the same level of protection to other products.
• Install the fixed version of FR Configurator2 on your personal computer running the products when communicating with FREQROL. FR Configurator2 provides comprehensive countermeasures that provide the same level of protection to other products.
• Install the fixed version of GT Designer3 on your personal computer running the products when communicating with GOT. GT Designer3 provides comprehensive countermeasures that provide the same level of protection to other products.
• Operate the products under an account that does not have administrator privileges.
• Install antivirus software on personal computers running the products.
• Restrict network exposure for all control system devices or systems to the minimum necessary, and ensure that they are not accessible from untrusted networks and hosts.
• Locate control system networks and remote devices behind firewalls and isolate them from the business network.
• Use a virtual private network (VPN) when remote access is required.

Refer to Mitsubishi Electric advisory 2020-021 for more information.

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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

• February 18, 2021: Initial Republication of Mitsubishi Electric 2020-021
• May 27, 2021: Update A - Added affected products.
• July 27, 2021: Update B - Added fixed product.
• November 16, 2021: Update C - Added fixed products.
• February 8, 2022: Update D - Added fixed products.
• May 24, 2022: Update E - Added fixed products.
• July 28, 2022: Update F - Added fixed products.
• November 17, 2022: Update G - Added fixed product.
• June 5, 2025: Update H - Added updated products and countermeasures.

• Mitsubishi Electric