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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-19-141-02) Mitsubishi Electric MELSEC-Q
Series Ethernet Module
24 May 2019
AusCERT Security Bulletin Summary
Product: Mitsubishi Electric MELSEC-Q Series Ethernet Module
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2019-10977
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Mitsubishi Electric MELSEC-Q Series Ethernet Module
Original release date: May 21, 2019
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1. EXECUTIVE SUMMARY
o CVSS v3 7.5
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Mitsubishi Electric
o Equipment: MELSEC-Q series Ethernet module
o Vulnerability: Uncontrolled Resource Consumption
2. RISK EVALUATION
Successful exploitation of this vulnerability may render the device
unresponsive, requiring a physical reset of the PLC (Programmable Logic
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following MELSEC-Q series Ethernet module is affected:
o QJ71E71-100 serial number 20121 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
An attacker could send crafted TCP packets against the FTP service, forcing the
target devices to enter an error mode and cause a denial-of-service condition.
CVE-2019-10977 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/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
Younes Dragoni and Alessandro Di Pinto of Nozomi Networks reported this
vulnerability to Mitsubishi and NCCIC.
Mitsubishi Electric has released new firmware Version 20122 for the QJ71E71-100
Ethernet module to mitigate the reported vulnerability.
Additional information about the vulnerabilities or Mitsubishi Electric's
compensating control is available by contacting a local Mitsubishi Electric
representative, which can be found at the following location:
Mitsubishi Electric strongly recommends that users should operate the affected
device behind a firewall.
NCCIC 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.
NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. 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-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability.
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