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AUSCERT External Security Bulletin Redistribution
ESB-2021.4149
Hitachi Energy XMC20 and FOX61x
8 December 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Hitachi Energy XMC20
Hitachi Energy FOX61x
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-40334 CVE-2021-40333
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-341-02
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ICS Advisory (ICSA-21-341-02)
Hitachi Energy XMC20 and FOX61x
Original release date: December 07, 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 9.0
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Hitachi Energy
o Equipment: XMC20 and FOX61x
o Vulnerabilities: Weak Password Requirements, Missing Handler
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
gain unauthorized access to the Data Communication Network (DCN) routing
configuration and cause a disruption to the Network Management (NMS) and
Network Element (NE) communication.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of XMC20 and FOX61x, multi-service network elements, are
affected:
o XMC20: All versions prior to R15A
o FOX61x: All versions prior to R15A
3.2 VULNERABILITY OVERVIEW
3.2.1 WEAK PASSWORD REQUIREMENTS CWE-521
This vulnerability is a weak default credential associated with TCP Port 26.
Successful exploitation of this vulnerability could allow an attacker to gain
unauthorized access to the DCN routing configuration.
CVE-2021-40333 has been assigned to this vulnerability. A CVSS v3 base score of
9.0 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:C/
C:L/I:H/A:H ).
3.2.2 MISSING HANDLER CWE-431
This vulnerability is due to the implementation of the proprietary management
protocol (TCP Port 5558), in which if SSH is activated, could cause a
disruption to the NMS and NE communication.
CVE-2021-40334 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:C/
C:N/I:N/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
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 users to upgrade to the most current version of their
products:
o XMC20: Upgrade to Version R15A
o FOX61x: Upgrade to Version R15A
Please refer to the Hitachi Energy XMC20 advisory for more details on affected
module information.
Please refer to the Hitachi Energy FOX61x advisory for more details on affected
module information.
Hitachi Energy recommends the following security practices and firewall
configurations to help protect process control networks from attacks that
originate from outside the network:
o Physically protect process control systems from direct access by
unauthorized personnel.
o Do not directly connect to the Internet.
o Separate from other networks by means of a firewall system that has a
minimal number of ports exposed.
o Portable computers and removable storage media should be carefully scanned
for viruses before they are connected to a control system.
For additional information and access to updated firmware, please contact the
Hitachi Energy service organization .
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
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.
No 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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