ICS Advisory (ICSA-21-049-02)

Mitsubishi Electric FA engineering software products (Update B)

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1. EXECUTIVE SUMMARY

  • CVSS v3 7.5
  • 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. UPDATE INFORMATION

This updated advisory is a follow-up to the original advisory titled ICSA-21-049-02 Mitsubishi Electric FA engineering software that was published February 18, 2021, to the ICS webpage on us-cert.cisa.gov.

3. RISK EVALUATION

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

4. TECHNICAL DETAILS

4.1 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, Versions 1.112R and prior
  • CW Configurator, Versions 1.011M and prior
  • Data Transfer, Versions 3.44W and prior
  • FR Configurator2, versions 1.24A and prior
  • GT Designer3 Version1(GOT1000), Versions 1.250L and prior
  • GT Designer3 Version1(GOT2000), Versions 1.250L and prior
  • GT SoftGOT1000 Version3, Versions 3.245F and prior
  • GT SoftGOT2000 Version1, Versions 1.250L and prior
  • GX LogViewer, Versions 1.115U and prior
  • iQ Monozukuri ANDON (Data Transfer), all versions
  • iQ Monozukuri Process Remote Monitoring (Data Transfer), all versions
  • PX Developer, versions 1.53F and prior
  • RT ToolBox3, versions 1.82L and prior
  • C Controller module setting and monitoring tool, all versions
  • EZSocket, all versions
  • FR Configurator SW3, all versions
  • FR Configurator, all versions
  • GX Configurator-DP, Versions 7.14Q and prior
  • GX Configurator-QP, all versions

--------- Begin Update B Part 1 of 2 ---------

  • GX Developer, Versions 8.506C and prior
  • MELSOFT Navigator, Versions 2.74C and prior

--------- End Update B Part 1 of 2 ---------

    • GX Explorer, all versions
    • GX IEC Developer, all versions
    • GX RemoteService-I, all versions
    • GX Works2, Versions 1.597X and prior
    • GX Works3, Versions 1.070Y and prior
    • M_CommDTM-HART, all versions
    • M_CommDTM-IO-Link, all versions
    • MELFA-Works, all versions
    • MELSEC WinCPU Setting Utility, all versions
    • MELSOFT EM Software Development Kit (EM Configurator), all versions
    • MH11 SettingTool Version2, all versions
    • MI Configurator, all versions
    • MT Works2, all versions
    • MX Component, all versions
    • Network Interface Board CC IE Control utility, all versions
    • Network Interface Board CC IE Field Utility, all versions
    • Network Interface Board CC-Link Ver.2 Utility, all versions
    • Network Interface Board MNETH utility, all versions
    • RT ToolBox2, all versions
    • Setting/monitoring tools for the C Controller module, all versions
    • SLMP Data Collector, all versions

    4.2 VULNERABILITY OVERVIEW

    4.2.1    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 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

    4.2.2    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 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

    4.3 BACKGROUND

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

    4.4 RESEARCHER

    dliangfun reported these vulnerabilities to Mitsubishi Electric.

    5. MITIGATIONS

    Mitsubishi Electric recommends that users download and update the latest version of each software product:

    • CPU Module Logging Configuration Tool, Version 1.118X or later
    • CW Configurator, Version 1.012N or later
    • Data Transfer, Version 3.45X or later. For updating the iQ Monozukuri ANDON and iQ Monozukuri Process Remote Monitoring, download the fixed version of Data Transfer in advance.
    • 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 LogViewer, Version 1.118X or later
    • PX Developer, Version 1.54G or later
    • RT ToolBox3, Version 1.90U or later
    • GX Configurator-DP, Version 7.15R or later. Contact a Mitsubishi Electric representative about GX Configurator-DP
    • GX Works2, Version 1.600A or later
    • GX Works3, Version 1.072A or later

    --------- Begin Update A Part 2 of 2 ---------

    • GX Developer, Version 8.507D or later
    • MELSOFT Navigator, Version 2.78G or later

    --------- End Update A Part 2 of 2 ---------

    Mitsubishi Electric recommends users who are using a product that has not released a fixed version or who cannot immediately update the product, take the following mitigations to minimize risk:

    • Install the fixed version of FR Configurator2 running the products on workstations when communicating with FREQROL. FR Configurator2 provides comprehensive countermeasures that give the same countermeasure effect to other products. 
    • Install the fixed version of GT Designer3 on workstations running the products when communicating with GOT. GT Designer3 provides comprehensive countermeasures that give the same countermeasure effect to other products.
    • Install the fixed version of GX Works3 on the computer running the products when communicating with MELSEC. Fixed software products that communicate with GOT and FREQROL are currently under development. GX Works3 provides comprehensive countermeasures that deliver the same countermeasures to other products.
    • Operate the products under an account that does not have administrator's privileges.
    • Install antivirus software in the computer running the products.
    • Restrict network exposure for all control system devices or systems to the minimum necessary, and ensure 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 virtual private network (VPN) when remote access is required.

    Please refer to the Mitsubishi Electric advisory for details on how to check firmware version.

    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 us-cert.cisa.gov. Several recommended 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 on us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

    Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.

    No known public exploits specifically target these vulnerabilities. 


    Contact Information

    For any questions related to this report, please contact the CISA at:

    Email: CISAservicedesk@cisa.dhs.gov
    Toll Free: 1-888-282-0870

    For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
    or incident reporting:  https://us-cert.cisa.gov/report

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