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AUSCERT External Security Bulletin Redistribution
ESB-2024.2149
ICS Advisory | ICSA-24-100-01 SUBNET PowerSYSTEM Server and Substation
Server
10 April 2024
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AusCERT Security Bulletin Summary
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Product: SUBNET PowerSYSTEM Server and Substation Server
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2024-3313
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-24-100-01
Comment: CVSS (Max): 8.4 CVE-2024-3313 (CVSS:3.1/AV:L/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/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-24-100-01)
SUBNET PowerSYSTEM Server and Substation Server
Release Date
April 09, 2024
1. EXECUTIVE SUMMARY
o CVSS v4 8.6
o ATTENTION : Low attack complexity
o Vendor : SUBNET Solutions Inc.
o Equipment : PowerSYSTEM Server, Substation Server 2021
o Vulnerabilities : Reliance on Insufficiently Trustworthy Component
2. RISK EVALUATION
Successful exploitation of the vulnerabilities in components used by
PowerSYSTEM Server 2021 and Substation Server 2021 could allow privilege
escalation, denial of service, or arbitrary code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
SUBNET Solutions reports that the following products use components with
vulnerabilities:
o PowerSYSTEM Server: version 4.07.00 and prior
o Substation Server 2021: version 4.07.00 and prior
3.2 Vulnerability Overview
3.2.1 RELIANCE ON INSUFFICIENTLY TRUSTWORTHY COMPONENT CWE-1357
SUBNET Solutions Inc. has identified vulnerabilities in third-party components
used in PowerSYSTEM Server 2021 and Substation Server 2021.
CVE-2024-3313 has been assigned to this vulnerability. A CVSS v3.1 base score
of 8.4 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:U
/C:H/I:H/A:H ).
A CVSS v4 score has also been calculated for CVE-2024-3313 . A base score of
8.6 has been calculated; the CVSS vector string is ( CVSS4.0/AV:L/AC:L/AT:N/
PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Canada
3.4 RESEARCHER
SUBNET Solutions reported these vulnerabilities to CISA.
4. MITIGATIONS
Subnet Solutions has fixed these issues by identifying and replacing out of
date libraries used in previous versions of PowerSYSTEM Server and Substation
Server 2021. Users are advised to update to version 4.09.00.927 or newer. To
obtain this software, contact Subnet Solution's Customer Service.
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities, such as:
o Minimize network exposure for all control system devices and/or systems,
ensuring they are not accessible from the internet .
o Locate control system networks and remote devices behind firewalls and
isolating them from business networks.
o When remote access is required, use more 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 the 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 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 .
CISA encourages organizations to implement recommended cybersecurity strategies
for proactive defense of ICS assets .
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 exploitation specifically targeting these vulnerabilities has
been reported to CISA at this time. These vulnerabilities are not exploitable
remotely.
5. UPDATE HISTORY
o April 9, 2024: Initial Publication
This product is provided subject to this Notification and this Privacy & Use
policy.
Vendor
SUBNET Solutions Inc.
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