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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3041
      Advisory (icsa-20-245-01) Mitsubishi Electric Multiple Products
                             4 September 2020

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

Product:           Mitsubishi Electric Multiple Products
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-16226  

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-20-245-01

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ICS Advisory (ICSA-20-245-01)

Mitsubishi Electric Multiple Products

Original release date: September 01, 2020

Legal Notice

All information products included in https://us-cert.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://www.us-cert.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.3
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Mitsubishi Electric
  o Equipment: Multiple Products
  o Vulnerability: Predictable Exact Value from Previous Values

2. RISK EVALUATION

Successful exploitation of this vulnerability could be used to hijack TCP
sessions and allow remote command execution.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

  o QJ71MES96, all versions
  o QJ71WS96, all versions
  o Q06CCPU-V, all versions
  o Q24DHCCPU-V, all versions
  o Q24DHCCPU-VG, all versions
  o R12CCPU-V, all versions
  o RD55UP06-V, all versions
  o RD55UP12-V, all versions
  o RJ71GN11-T2, all versions
  o RJ71EN71, all versions
  o QJ71E71-100, all versions
  o LJ71E71-100, all versions
  o QJ71MT91, all versions
  o RD78Gn(n=4,8,16,32,64), all versions
  o RD78GHV, all versions
  o RD78GHW, all versions
  o NZ2GACP620-60, all versions
  o NZ2GACP620-300, all versions
  o NZ2FT-MT, all versions
  o NZ2FT-EIP, all versions
  o Q03UDECPU, the first 5 digits of serial number 22081 and prior
  o QnUDEHCPU(n=04/06/10/13/20/26/50/100), the first 5 digits of serial number
    22081 and prior
  o QnUDVCPU(n=03/04/06/13/26), the first 5 digits of serial number 22031 and
    prior
  o QnUDPVCPU(n=04/06/13/2), the first 5 digits of serial number 22031 and
    prior
  o LnCPU(-P)(n=02/06/26), the first 5 digits of serial number 22051 and prior
  o L26CPU-(P)BT, the first 5 digits of serial number 22051 and prior
  o RnCPU(n=00/01/02), Version 18 and prior
  o RnCPU(n=04/08/16/32/120), Version 50 and prior
  o RnENCPU(n=04/08/16/32/120), Version 50 and prior
  o RnSFCPU (n=08/16/32/120), all versions
  o RnPCPU(n=08/16/32/120), all versions
  o RnPSFCPU(n=08/16/32/120), all versions
  o FX5U(C)-**M*/**
       Case1: Serial number 17X**** or later: Version 1.210 and prior
       Case2: Serial number 179**** and prior: Version 1.070 and prior
  o FX5UC-32M*/**-TS, Version 1.210 and prior
  o FX5UJ-**M*/**, Version 1.000
  o FX5-ENET, all versions
  o FX5-ENET/IP, all versions
  o FX3U-ENET-ADP, all versions
  o FX3GE-**M*/**, all versions
  o FX3U-ENET, all versions
  o FX3U-ENET-L, all versions
  o FX3U-ENET-P502, all versions
  o FX5-CCLGN-MS, all versions
  o IU1-1M20-D, all versions
  o LE7-40GU-L, all versions
  o GOT2000 Series GT21 Model, all versions
  o GS Series, all versions
  o GOT1000 Series GT14 Model, all versions
  o GT25-J71GN13-T2, all versions
  o FR-A800-E Series, all versions
  o FR-F800-E Series, all versions
  o FR-A8NCG, Production date August 2020 and prior
  o FR-E800-EPA Series, Production date July 2020 and prior
  o FR-E800-EPB Series, Production date July 2020 and prior
  o Conveyor Tracking Application APR-nTR3FH, APR-nTR6FH, APR-nTR12FH,
    APR-nTR20FH(n=1,2), all versions (Discontinued product)
  o MR-JE-C, all versions
  o MR-J4-TM, all versions

3.2 VULNERABILITY OVERVIEW

3.2.1 PREDICTABLE EXACT VALUE FROM PREVIOUS VALUES CWE-342

The affected products are vulnerable to impersonation of a legitimate device by
a malicious actor, which may allow an attacker to remotely execute arbitrary
commands.

CVE-2020-16226 has been assigned to this vulnerability. A CVSS v3 base score of
7.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:L/I:L/A:L ).

3.3 BACKGROUND

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

3.4 RESEARCHER

Ta-Lun Yen of TXOne IoT/ICS Security Research Labs of Trend Micro, working with
Trend Micro's Zero Day Initiative, reported this vulnerability to CISA.

4. MITIGATIONS

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

  o Use a firewall or VPN, etc. to prevent unauthorized access when Internet
    access is required.
  o Use within a LAN and ensure that they are not accessible from untrusted
    networks and hosts.
  o Install an antivirus software in your personal computer that can access the
    product.
  o RnCPU(n=00/01/02), Version 18 and prior: Update to Version 19 or later.
  o RnCPU(n=04/08/16/32/120), Version 50 and prior. Please update to Version 51
    or later.
  o RnENCPU(n=04/08/16/32/120), Versions 50 and prior: Update to Version 51 or
    later.
  o FX5U(C)-**M*/**
       Case1: Serial number 17X**** or later, Version 1.210 and prior: Update
        to Version 1.211 or later.
       Case2: Serial number 179**** and prior, Version 1.070 and prior: Update
        to Version 1.071 or later.
  o FX5UC-32M*/**-TS, Version 1.210 and prior: Update to Version 1.211 or
    later.
  o FX5UJ-**M*/**, Version 1.000: Update to Version 1.001 or later.

Please contact Mitsubishi Electric for more information.

CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

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

CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.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.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 this vulnerability.

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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