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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0623
   Avisory (icsa-21-049-02) Mitsubishi FA Engineering Software Products
                             19 February 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Mitsubishi Electric FA Engineering Software
Publisher:         ICS-CERT
Operating System:  Network Appliance
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-20588 CVE-2021-20587 

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-21-049-02

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than ICS-CERT. It is recommended that administrators
           running Mitsubishi Electric FA Engineering Software check for an 
         updated version of the software for their operating system.

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ICS Advisory (ICSA-21-049-02)

Mitsubishi Electric FA engineering software products

Original release date: February 18, 2021

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.5
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Mitsubishi Electric
  o Equipment: FA engineering software products
  o 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:

  o C Controller module setting and monitoring tool, all versions
  o CPU Module Logging Configuration Tool, all versions
  o CW Configurator, all versions
  o Data Transfer, all versions
  o EZSocket, all versions
  o FR Configurator, all versions
  o FR Configurator SW3, all versions
  o FR Configurator2, all versions
  o GT Designer3 Version1(GOT1000), all versions
  o GT Designer3 Version1(GOT2000), all versions
  o GT SoftGOT1000 Version3, all versions
  o GT SoftGOT2000 Version1, all versions
  o GX Configurator-DP, Versions 7.14Q and prior
  o GX Configurator-QP, all versions
  o GX Developer, all versions
  o GX Explorer, all versions
  o GX IEC Developer, all versions
  o GX LogViewer, all versions
  o GX RemoteService-I, all versions
  o GX Works2, Versions 1.597X and prior
  o GX Works3, Versions 1.070Y and prior
  o M_CommDTM-HART, all versions
  o M_CommDTM-IO-Link, all versions
  o MELFA-Works, all versions
  o MELSEC WinCPU Setting Utility, all versions
  o MELSOFT EM Software Development Kit (EM Configurator), all versions
  o MELSOFT Navigator, all versions
  o MH11 SettingTool Version2, all versions
  o MI Configurator, all versions
  o MT Works2, all versions
  o MX Component, all versions
  o Network Interface Board CC IE Control utility, all versions
  o Network Interface Board CC IE Field Utility, all versions
  o Network Interface Board CC-Link Ver.2 Utility, all versions
  o Network Interface Board MNETH utility, all versions
  o PX Developer, all versions
  o RT ToolBox2, all versions
  o RT ToolBox3, all versions
  o Setting/monitoring tools for the C Controller module, all versions
  o SLMP Data Collector, all versions

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 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 ).

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 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 ).

3.3 BACKGROUND

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

3.4 RESEARCHER

dliangfun reported these vulnerabilities to Mitsubishi Electric.

4. MITIGATIONS

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

  o GX Configurator-DP, Version 7.15R or later
  o GX Works2, Version 1.600A or later
  o GX Works3, Version 1.072A or later

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:

  o 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.
  o Operate the products under an account that does not have administrator's
    privileges.
  o Install antivirus software in the computer running the products.
  o 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.
  o Locate control system networks and remote devices behind firewalls and
    isolate them from the business network.
  o 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 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 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.

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

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

CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.

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