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AUSCERT External Security Bulletin Redistribution
ESB-2022.2437
Advisory (icsa-22-137-01) Circutor COMPACT DC-S BASIC
18 May 2022
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AusCERT Security Bulletin Summary
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Product: Circutor COMPACT DC-S BASIC
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Mitigation
CVE Names: CVE-2022-1669
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-137-01
Comment: CVSS (Max): 6.8 CVE-2022-1669 (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
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ICS Advisory (ICSA-22-137-01)
Circutor COMPACT DC-S BASIC
Original release date: May 17, 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 6.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Circutor
o Equipment: COMPACT DC-S BASIC
o Vulnerability: Stack-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation of this vulnerability could cause a buffer overflow
condition resulting in remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Circutor COMPACT DC-S BASIC, a smart metering
concentrator, are affected:
o Circutor COMPACT DC-S BASIC: CIR_CDC_v1.2.17
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
A buffer overflow vulnerability has been detected in the firewall function of
the device management web portal. The device runs a CGI binary (index.cgi) to
offer a management web application. Once authenticated with valid credentials
in this web portal, a potential attacker could submit any "Address" value and
it would be copied to a second variable with a "strcpy" vulnerable function
without checking its length. Because of this, it is possible to send a long
address value to overflow the process stack, controlling the function return
address.
CVE-2022-1669 has been assigned to this vulnerability. A CVSS v3 base score of
6.8 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:N/S:U/C:N/
I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Spain
3.4 RESEARCHER
Angel Garcia Moreno reported this vulnerability to CISA.
4. MITIGATIONS
Circutor has not responded to requests to work with CISA to mitigate this
vulnerability. Users of these affected products are invited to contact Circutor
customer support for additional information.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. 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 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 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 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 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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