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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-119-02) Cassia Networks Access Controller
30 April 2021
AusCERT Security Bulletin Summary
Product: Cassia Networks Access Controller
Operating System: Network Appliance
Impact/Access: Unauthorised Access -- Existing Account
Reduced Security -- Existing Account
CVE Names: CVE-2021-22685
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ICS Advisory (ICSA-21-119-02)
Cassia Networks Access Controller
Original release date: April 29, 2021
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 6.2
o ATTENTION: Low attack complexity
o Vendor: Cassia Networks
o Equipment: Access Controller
o Vulnerability: Path Traversal
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to read
any file from the Access Controller server.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Access Contoller are affected:
o Access Controller: All versions prior to 2.0.1
3.2 VULNERABILITY OVERVIEW
3.2.1 PATH TRAVERSAL CWE-22
An attacker may be able to use minify route with a relative path to view any
file on the server.
CVE-2021-22685 has been assigned to this vulnerability. A CVSS v3 base score of
6.2 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:U/C:H/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
Amir Preminger and Sharon Brizinov of Claroty reported this vulnerability to
Cassia Networks has released a patch (login required) that mitigates the
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 that 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 us-cert.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 us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
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. This
vulnerability is not exploitable remotely.
For any questions related to this report, please contact the CISA at:
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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