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             AUSCERT External Security Bulletin Redistribution

                               ESB-2022.4662
        Advisory (icsa-22-263-02) Hitachi Energy AFF660/665 Series
                             21 September 2022

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Hitachi Energy AFF660/665 Series
Publisher:         ICS-CERT
Operating System:  Network Appliance
Resolution:        Mitigation
CVE Names:         CVE-2020-6994  

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-22-263-02

Comment: CVSS (Max):  9.8 CVE-2020-6994 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
         CVSS Source: ICS-CERT
         Calculator:  https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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ICS Advisory (ICSA-22-263-02)

Hitachi Energy AFF660/665 Series

Original release date: September 20, 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 9.8
  o ATTENTION: Exploitable remotely/low attack complexity
  o Vendor: Hitachi Energy
  o Equipment: AFF660/665 Firewall
  o Vulnerability: Stack-based Buffer Overflow

2. RISK EVALUATION

Successful exploitation of this vulnerability could overflow a buffer on the
device and fully compromise it.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Hitachi Energy AFF660/665, an industrial firewall,
are affected:

  o Hitachi Energy AFF660 FW: Versions 03.0.02 and prior
  o Hitachi Energy AFF665 FW: Versions 03.0.02 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121

An improper parsing of URL arguments allows an attacker to exploit this
vulnerability by crafting specially formed HTTP requests to overflow an
internal buffer. Successful exploitation could cause a full compromise of the
device.

CVE-2020-6994 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:H/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 this vulnerability to CISA.

4. MITIGATIONS

Hitachi Energy for AFF660 FW and AFF665 FW versions 03.0.02 and prior
recommends users to implement the following security measures:

  o Use the "IP Access Restriction" feature to restrict HTTP and HTTPS traffic
    to trusted IP addresses.
  o Disable the HTTP and HTTPS server.

Hitachi Energy recommends users follow the recommended security practices and
firewall configurations to help protect from outside attacks. Recommended
security practices include:

  o Ensuring process control systems are physically protected from unauthorized
    direct access
  o Ensuring process control systems have no direct connections to the Internet
  o Using a firewall system to separate process control systems from separated
    from other networks. The firewall system should have only the necessary
    ports open.

Hitachi Energy does not recommend process control systems be used for internet
surfing, instant messaging, or receiving emails. Portable computers and
removable storage media should be carefully scanned for viruses before they are
connected to a control system.

For more information, see Hitachi Energy's security advisory 8DBD000122 .

CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability 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 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 this vulnerability.

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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