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AUSCERT External Security Bulletin Redistribution
ESB-2022.4079
Advisory (icsa-22-228-07) Sequi PortBloque S
17 August 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Sequi PortBloque S
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Mitigation
CVE Names: CVE-2022-2662 CVE-2022-2661
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-228-07
Comment: CVSS (Max): 9.9 CVE-2022-2661(CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/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:L/UI:N/S:C/C:H/I:H/A:H
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ICS Advisory (ICSA-22-228-07)
Sequi PortBloque S
Original release date: August 16, 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 9.9
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Sequi
o Equipment: Sequi PortBloque S
o Vulnerabilities : Improper Authentication, Improper Authorization
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could result in unauthorized
changes to device configuration, to include adding new users or changing
existing passwords for persistent access to the device.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Sequi PortBloque S, a serial Modbus firewall, are
affected:
o Sequi PortBloque S: All versions
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER AUTHENTICATION CWE-287
The affected product has improper authentication issues which may allow an
attacker to bypass the authentication process and gain user-level access to the
device.
CVE-2022-2662 has been assigned to this vulnerability. A CVSS v3 base score of
9.6 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:C/
C:H/I:H/A:H ).
3.2.2 IMPROPER AUTHORIZATION CWE-285
The affected product has an improper authorization vulnerability, which may
allow a low-privileged user to perform administrative functions using
specifically crafted requests.
CVE-2022-2661 has been assigned to this vulnerability. A CVSS v3 base score of
9.9 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
3.4 RESEARCHER
Byron Chaney of Accenture Security reported these vulnerabilities to CISA.
4. MITIGATIONS
As of August 9, 2022, Sequi has not responded to requests to work with CISA to
mitigate these vulnerabilities. Users of this affected product should contact
Sequi for additional information.
CISA will update this ICSA to reflect any patches, updates, or mitigation
information Sequi provides in the future.
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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