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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2013
     Advisory (icsa-20-161-02) Mitsubishi Electric MELSEC iQ-R series
                               10 June 2020

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

Product:           Mitsubishi Electric MELSEC iQ-R series
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-13238  

Original Bulletin: 
   https://www.us-cert.gov/ics/advisories/icsa-20-161-02

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ICS Advisory (ICSA-20-161-02)

Mitsubishi Electric MELSEC iQ-R series

Original release date: June 09, 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
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1. EXECUTIVE SUMMARY

  o CVSS v3 5.3
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Mitsubishi Electric
  o Equipment: MELSEC iQ-R series
  o Vulnerability: Resource Exhaustion

2. RISK EVALUATION

Successful exploitation of this vulnerability could cause the Ethernet port to
enter a denial-of-service condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Mitsubishi Electric reports that the vulnerability affects the following MELSEC
iQ-R series modules:

  o R04/08/16/32/120CPU, R04/08/16/32/120ENCPU: Firmware Versions 39 or earlier
  o R00/01/02CPU: Firmware Versions 7 or earlier
  o R08/16/32/120SFCPU: Firmware Versions 20 or earlier
  o R08/16/32/120PCPU: All versions
  o R08/16/32/120PSFCPU: All versions
  o RJ71EN71: All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400

Uncontrolled resource consumption can be caused when an attacker sends a large
amount of specially crafted packets in bursts over a short period.

CVE-2020-13238 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:L ).

3.3 BACKGROUND

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

3.4 RESEARCHER

Yossi Reuven of SCADAfence reported this vulnerability to Mitsubishi Electric.

4. MITIGATIONS

Mitsubishi Electric recommends users of the affected devices mitigate impact of
this vulnerability by using firewalls to block access from unreliable networks
and hosts.

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

  o Use secure methods when remote access is required, 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 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.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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