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AUSCERT External Security Bulletin Redistribution
ESB-2022.4459
Advisory (icsa-22-249-04) Hitachi Energy TXpert Hub CoreTec 4
8 September 2022
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AusCERT Security Bulletin Summary
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Product: Hitachi Energy TXpert Hub CoreTec 4
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2021-35532 CVE-2021-35531 CVE-2021-35530
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-249-04
Comment: CVSS (Max): 6.0 CVE-2021-35532 (CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:L)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:L
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ICS Advisory (ICSA-22-249-04)
Hitachi Energy TXpert Hub CoreTec 4
Original release date: September 06, 2022
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 6.0
o Vendor: Hitachi Energy
o Equipment: TXpert Hub CoreTec 4
o Vulnerabilities: Authentication Bypass Using an Alternate Path or Channel,
Improper Input Validation, Download of Code Without Integrity Check
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
cause a denial-of-service condition on the product, modify configuration,
obtain sensitive information from the device, and load malicious firmware.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of TXpert Hub CoreTec 4, a digital transformer
monitoring and diagnostics device, are affected:
o TXpert Hub CoreTec 4 version 2.0.0, 2.0.1
o TXpert Hub CoreTec 4 version 2.1.0, 2.1.1, 2.1.2, 2.1.3
o TXpert Hub CoreTec 4 version 2.2.0, 2.2.1
3.2 VULNERABILITY OVERVIEW
3.2.1 AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288
A vulnerability in the application authentication and authorization mechanism
in the affected product depends on a token validation of the session
identifier. The vulnerability allows an unauthorized modified message to be
executed in the server, enabling an attacker to change an existing user's
password, and gain authorized access into the system.
CVE-2021-35530 has been assigned to this vulnerability. A CVSS v3 base score of
6.0 has been assigned; the CVSS vector string is ( AV:L/AC:H/PR:H/UI:N/S:U/C:H/
I:H/A:L ).
3.2.2 IMPROPER INPUT VALIDATION CWE-20
An Improper Input Validation vulnerability in a particular configuration
setting field of the affected product allows an attacker, who has access to an
authorized user with ADMIN or ENGINEER role rights, to inject an operating
system (OS) command; this command will then be executed by the system.
CVE-2021-35531 has been assigned to this vulnerability. A CVSS v3 base score of
6.0 has been assigned; the CVSS vector string is ( AV:L/AC:H/PR:H/UI:N/S:U/C:H/
I:H/A:L ).
3.2.3 DOWNLOAD OF CODE WITHOUT INTEGRITY CHECK CWE-494
A vulnerability exists in the file upload validation component of the affected
product. The vulnerability allows an attacker to gain access to the system and
obtain an account with sufficient privilege to then upload a malicious firmware
to the product.
CVE-2021-35532 has been assigned to this vulnerability. A CVSS v3 base score of
6.0 has been assigned; the CVSS vector string is ( AV:L/AC:H/PR:H/UI:N/S:U/C:H/
I:H/A:L ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Switzerland
3.4 RESEARCHER
Hitachi Energy reported these vulnerabilities to CISA.
4. MITIGATIONS
Hitachi Energy recommends updating the affected products to the following
versions:
o TXpert Hub CoreTec 4 version 2.3.0 or higher
Note: The above update version remediates CVE-2021-35530 and CVE-2021-35531
specifically.
Hitachi Energy also recommends the following security practices and firewall
configurations to protect against attacks that originate from outside the
network:
o Physically protect process control systems from unauthorized direct access.
o Do not expose process control systems to the internet.
o Use a firewall system with the necessary ports open to separate process
control systems from other networks.
o Process control systems should not be used for internet surfing, instant
messaging, or receiving emails.
o Portable computers and removable storage media should be carefully scanned
for viruses before connecting to process control systems.
Hitachi Energy recommends the following workarounds to reduce the risk of
exploiting the vulnerabilities:
o Ensure users of the system have individual user accounts; shared user
accounts should not be used.
o Users should have only the necessary rights required.
o System default user accounts should be deleted.
Additionally, Hitachi Energy recommends following product Security Deployment
Guidelines. Recommended practices for the affected product can be found in the
TXpert Hub CoreTec 4 Software Manual.
For more information, see Hitachi Energy security advisory 8DBD000080
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability these vulnerabilities. Specifically, users
should:
o Minimize network exposure for all control system devices and/or systems,
and ensure they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls and
isolate them from business networks.
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 at cisa.gov/ics . Several CISA products detailing cyber
defense best 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 at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
No known public exploits specifically target these vulnerabilities. These
vulnerabilities are not exploitable remotely. These vulnerabilities have a high
attack complexity.
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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