Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2021.4097
Advisory (icsa-21-336-08) Hitachi Energy RTU500 series
3 December 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Hitachi Energy RTU500 series
Publisher: CIS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3517 CVE-2020-24977 CVE-2020-1968
Reference: ESB-2021.3431
ESB-2021.2897
ESB-2021.2657
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-336-08
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-21-336-08)
Hitachi Energy RTU500 series
Original release date: December 02, 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 8.6
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Hitachi Energy
o Equipment: RTU500 series
o Vulnerabilities: Observable Discrepancy, Buffer Over-read, Out-of-bounds
Read
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
eavesdrop on traffic, retrieve information from memory, or cause a
denial-of-service condition.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of the RTU500 series, a remote terminal unit, are
affected:
o RTU500 series CMU Firmware: Version 11.*
o RTU500 series CMU Firmware: Version 12.0.*
o RTU500 series CMU Firmware: Version 12.2.*
o RTU500 series CMU Firmware: Version 12.4.*
o RTU500 series CMU Firmware: Version 12.6.*
o RTU500 series CMU Firmware: Version 12.7.*
o RTU500 series CMU Firmware: Version 13.0.*
o RTU500 series CMU Firmware: Version 13.1.*
o RTU500 series CMU Firmware: Version 13.2.1
3.2 VULNERABILITY OVERVIEW
3.2.1 OBSERVABLE DISCREPANCY CWE-203
The Raccoon attack exploits a flaw in the TLS specification, which can lead to
an attacker computing pre-master secret in connections that have used a
Diffie-Hellman- based cipher suite. An attacker can then eavesdrop on all
encrypted communications sent over the exploited TLS connection.
CVE-2020-1968 has been assigned to this vulnerability. A CVSS v3 base score of
3.7 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/
C:L/I:N/A:N ).
3.2.2 BUFFER OVER-READ CWE-126
There is a global buffer over-read vulnerability in xmlEncodeEntitiesInternal
in the affected libxml2/entities.c.
CVE-2020-24977 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:N/UI:N/S:U/
C:L/I:N/A:L ).
3.2.3 OUT-OF-BOUNDS READ CWE-125
A vulnerability exists in the xml entity encoding functionality of the affected
libxml2. An attacker can use a specially crafted file to trigger an
out-of-bounds read.
CVE-2021-3517 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:U/
C:L/I:L/A:H ).
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 users take the following actions at the earliest
convenience:
o RTU500 series CMU Firmware Version 11.*: This product version is
end-of-life (EOL). Upgrade to a non-affected support version. See below for
the current mitigation strategy.
o RTU500 series CMU Firmware Version 12.0.1 - 12.0.13: Update to RTU500
series CMU Firmware Version 12.0.14 (to be released by end-of-February
2022). See below for the current mitigation strategy.
o RTU500 series CMU Firmware Version 12.2.1 - 12.2.10: Update to RTU500
series CMU Firmware as of Version 12.2.11
o RTU500 series CMU Firmware Version 12.4.1 - 12.4.10: Update to RTU500 CMU
Firmware as of Version 12.4.11 (to be released by end-of-January 2022). See
below for the current mitigation strategy.
o RTU500 series CMU Firmware Version 12.6.1 - 12.6.6: Update to RTU500 series
CMU firmware as of Version 12.6.7 (to be released by end-of-December 2021).
See below for the current mitigation strategy.
o RTU500 series CMU Firmware Version 12.7.1: Update to RTU500 series CMU
Firmware as of Version 12.7.2
o RTU500 series CMU Firmware Version 13.0.1 - 13.0.2: Upgrade to the latest
RTU500 series CMU Firmware as of Version 13.2.3. See below for the current
mitigation strategy.
o RTU500 series CMU Firmware Version 13.1.1 - 13.1.2: Upgrade to the latest
RTU500 series CMU Firmware as of Version 13.2.3. See below for the current
mitigation strategy.
o RTU500 series CMU Firmware Version 13.2.1: Upgrade to the latest RTU500
series CMU Firmware as of Version 13.2.3. See below for the current
mitigation strategy.
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 Process control systems should not be used for Internet surfing, instant
messaging, or receiving e-mails.
o Portable computers and removable storage media should be carefully scanned
for viruses before they are connected to a control system.
Please see Hitachi Energy advisory 8DBD000064 for additional mitigation and
update information.
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.
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.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=7n7t
-----END PGP SIGNATURE-----