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AUSCERT External Security Bulletin Redistribution
ESB-2021.3043
Advisory (icsa-21-252-03) Mitsubishi Electric Europe B.V.
smartRTU and INEA ME-RTU
10 September 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Mitsubishi Electric Europe B.V. smartRTU
Mitsubishi Electric Europe B.V. INEA ME-RTU
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Privileged Data -- Remote/Unauthenticated
Cross-site Scripting -- Existing Account
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-14931 CVE-2019-14930 CVE-2019-14929
CVE-2019-14928 CVE-2019-14927 CVE-2019-14926
CVE-2019-14925
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-252-03
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ICS Advisory (ICSA-21-252-03)
Mitsubishi Electric Europe B.V. smartRTU and INEA ME-RTU
Original release date: September 09, 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 9.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Mitsubishi Electric Europe B.V.
o Equipment: smartRTU and INEA ME-RTU
o Vulnerabilities: OS Command Injection, Improper Access Control, Cross-site
Scripting, Use of Hard-coded Credentials, Unprotected Storage of
Credentials, Incorrect Default Permissions
2. REPOSTED INFORMATION
This advisory is a follow-up to a CISA product update titled
ICS-ALERT-19-225-01 Mitsubishi Electric Europe B.V. smartRTU and INEA ME-RTU
(Update A) published September 10, 2019, on the ICS webpage on
us-cert.cisa.gov.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
gain remote code execution, obtain credentials, and use credentials found to
log into other affected devices.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following products are affected:
o smartRTU and INEA ME-RTU: All firmware versions prior to Version 3.3
4.2 VULNERABILITY OVERVIEW
4.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN OS COMMAND ('OS
COMMAND INJECTION') CWE-78
The affected product allows an attacker to execute arbitrary commands due to
the passing of unsafe user supplied data to the system shell.
CVE-2019-14931 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
4.2.2 IMPROPER ACCESS CONTROL CWE-284
It is possible to download the affected product's configuration file, which
contains sensitive data, through the URL.
CVE-2019-14927 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:H/I:N/A:N ).
4.2.3 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
The affected product's web configuration software allows an authenticated user
to inject malicious data into the application that can then be executed in a
victim's browser, allowing stored cross-site scripting.
CVE-2019-14928 has been assigned to this vulnerability. A CVSS v3 base score of
5.4 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:R/S:C/
C:L/I:L/A:N ).
4.2.4 USE OF HARD-CODED CREDENTIALS CWE-798
Hard-coded SSH keys have been identified in the affected product's firmware. As
the secure keys cannot be regenerated by a user and are not regenerated on
firmware updates, all deployed affected products utilize the same SSH keys.
CVE-2019-14926 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
4.2.5 USE OF HARD-CODED CREDENTIALS CWE-798
The affected products contain undocumented user accounts with hard-coded
password credentials. An attacker could exploit this vulnerability by using the
accounts to login to affected RTU's.
CVE-2019-14930 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
4.2.6 UNPROTECTED STORAGE OF CREDENTIALS CWE-256
The affected products store password credentials in plain text in a
configuration file. An unauthenticated user can obtain the exposed password
credentials to gain access to the specific services.
CVE-2019-14929 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
4.2.7 INCORRECT DEFAULT PERMISSIONS CWE-276
The affected products store and reads configuration settings from a file that
has insecure world-readable permissions assigned. This could allow all users on
the system to read the configuration file containing usernames and plain text
password combinations, as well as other sensitive configuration information of
the RTU.
CVE-2019-14925 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
C:H/I:N/A:N ).
4.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
4.4 RESEARCHER
Mark Cross (@xerubus) reported these vulnerabilities to CISA.
5. MITIGATIONS
Mitsubishi Electric Europe B.V. recommends users update to firmware Version 3.3
or later .
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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 VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its 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.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.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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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