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AUSCERT External Security Bulletin Redistribution
ESB-2020.2147
Advisory (icsa-20-170-02) Mitsubishi Electric MC Works64, MC Works32
22 June 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric MC Works
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-12015 CVE-2020-12013 CVE-2020-12011
CVE-2020-12009 CVE-2020-12007
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-20-170-02
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ICS Advisory (ICSA-20-170-02)
Mitsubishi Electric MC Works64, MC Works32
Original release date: June 18, 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 9.4
o ATTENTION: Exploitable remotely
o Vendor: Mitsubishi Electric
o Equipment: MC Works64, MC Works32
o Vulnerabilities: Out-of-bounds Write, Deserialization of Untrusted Data,
Code Injection
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow remote code
execution, a denial-of-service condition, information disclosure, or
information tampering.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following products versions are affected:
o MC Works64 Version 4.02C (10.95.208.31) and earlier, all versions
o MC Works32 Version 3.00A (9.50.255.02)
3.2 VULNERABILITY OVERVIEW
3.2.1 OUT-OF-BOUNDS WRITE CWE-787
A specially crafted communication packet sent to the affected MC Works64
Broker64 or MC Works32 Broker32 systems could cause a denial-of-service
condition or allow remote code execution.
CVE-2020-12011 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.2 DESERIALIZATION OF UNTRUSTED DATA CWE-502
A specially crafted communication packet sent to the affected MC Works64
platform services could cause a denial-of-service condition due to improper
deserialization.
CVE-2020-12015 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 ).
3.2.3 DESERIALIZATION OF UNTRUSTED DATA CWE-502
A specially crafted communication packet sent to the affected MC Works64
Workbench Pack & Go function could allow remote code execution due to improper
deserialization.
CVE-2020-12009 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 ).
3.2.4 IMPROPER CONTROL OF GENERATION OF CODE ('CODE INJECTION') CWE-94
A specially crafted message sent from a custom client function that interfaces
to the affected MC Works64 GridWorX server may allow the execution of certain
arbitrary SQL commands remotely and disclose internal data or allow internal
data tampering.
CVE-2020-12013 has been assigned to this vulnerability. A CVSS v3 base score of
9.4 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:L ).
3.2.5 DESERIALIZATION OF UNTRUSTED DATA CWE-502
A specially crafted communication packet sent to the affected MC Works64
FrameWorX server could allow remote code execution and a denial-of-service
condition due to the deserialization vulnerability.
CVE-2020-12007 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
Tobias Scharnowski, Niklas Breitfeld, Ali Abbasi, and Yehuda Anikster of
Claroty; Pedro Ribeiro and Radek Domanski of Flashback; Ben McBride of Oak
Ridge National Laboratory; and Steven Seeley and Chris Anastasio of Incite
reported these vulnerabilities to ICONICS, a group company of Mitsubishi
Electric.
4. MITIGATIONS
Mitsubishi Electric recommends updating to the latest software version or
applying security patches.
Users can get the installer of the latest software version or security patches
in one of the following ways:
o Download the latest software versions from the MC Works Vulnerability
Information website.
o Contact a Mitsubishi Electric representative.
For more information about these vulnerabilities and related workarounds, see
the MC Works Vulnerability Information website .
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 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 these vulnerabilities. High skill
level is needed to exploit.
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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