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AUSCERT External Security Bulletin Redistribution
ESB-2022.6279
Advisory (icsa-22-335-02) Horner Automation Remote Compact Controller
2 December 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Horner Automation Remote Compact Controller
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-2642 CVE-2022-2641 CVE-2022-2640
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-335-02
Comment: CVSS (Max): 9.8 CVE-2022-2641 (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-22-335-02)
Horner Automation Remote Compact Controller
Original release date: December 01, 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: Horner Automation
o Equipment: Remote Compact Controller (RCC) 972
o Vulnerabilities: Inadequate Encryption Strength, Use of Hard-coded
Cryptographic Key, Excessive Reliance on Global Variables
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
obtain credentials to the affected device and obtain complete control.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following version of Remote Compact Controller (RCC) 972, an all-in-one I/O
controller, is affected:
o RCC 972: Firmware Version 15.40
3.2 VULNERABILITY OVERVIEW
3.2.1 INADEQUATE ENCRYPTION STRENGTH CWE-326
The Config-files of Horner Automation's RCC 972 with firmware version 15.40 are
encrypted with weak XOR encryption vulnerable to reverse engineering. This
could allow an attacker to obtain credentials to run services such as File
Transfer Protocol (FTP) and Hypertext Transfer Protocol (HTTP).
CVE-2022-2640 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:N/A:N ).
3.2.2 USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321
Horner Automation's RCC 972 with firmware version 15.40 has a static encryption
key on the device. This could allow an attacker to perform unauthorized changes
to the device, remotely execute arbitrary code, or cause a denial-of-service
condition.
CVE-2022-2641 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 ).
3.2.3 EXCESSIVE RELIANCE ON GLOBAL VARIABLES CWE-1108
Horner Automation's RCC 972 firmware version 15.40 contains global variables.
This could allow an attacker to read out sensitive values and variable keys
from the device.
CVE-2022-2642 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:N/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
3.4 RESEARCHER
m1etz reported these vulnerabilities through the Computer Emergency Response
Team, CERT-Bund, to CISA.
4. MITIGATIONS
Horner Automation recommends that users update RCC 972 to the latest firmware
available to mitigate the risk of this vulnerability:
o RCC 972: Update to Firmware Version 15.60 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 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.
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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