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AUSCERT External Security Bulletin Redistribution
ESB-2024.2406
ICS Advisory | ICSA-24-109-01 Unitronics Vision Series PLCs
19 April 2024
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AusCERT Security Bulletin Summary
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Product: Unitronics Vision Series PLCs
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Mitigation
CVE Names: CVE-2024-1480
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-24-109-01
Comment: CVSS (Max): 7.5 CVE-2024-1480 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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ICS Advisory (ICSA-24-109-01)
Unitronics Vision Series PLCs
Release Date
April 18, 2024
1. EXECUTIVE SUMMARY
o CVSS v4 8.7
o ATTENTION : Exploitable remotely/low attack complexity
o Vendor : Unitronics
o Equipment : Vision series PLCs
o Vulnerability : Storing Passwords in a Recoverable Format
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to log in
to the Remote HMI feature, where the PLC may be factory reset, stopped, and
restarted.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Unitronics Vision 230 PLCs are affected:
o Vision 230: All versions
o Vision 280: All versions
o Vision 290: All versions
o Vision 530: All versions
o Vision 120: All versions
3.2 Vulnerability Overview
3.2.1 Storing Passwords in a Recoverable Format CWE-257
Unitronics Vision Standard PLCs allow a remote, unauthenticated individual to
retrieve the 'Information Mode' password in plaintext.
CVE-2024-1480 has been assigned to this vulnerability. A CVSS v3.1 base score
of 7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U
/C:H/I:N/A:N ).
A CVSS v4 score has also been calculated for CVE-2024-1480 . A base score of
8.7 has been calculated; the CVSS vector string is ( CVSS4.0/AV:N/AC:L/AT:N/
PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Water and Wastewater
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Israel
3.4 RESEARCHER
Reid Wightman of Dragos reported this vulnerability to CISA.
4. MITIGATIONS
Dragos recommends users to restrict access to the PLC on TCP/20256 by either
changing the default programmer port, or apply a multi-factor VPN to protect
the service from remote access.
Unitronics has not responded to requests to work with CISA to mitigate this
vulnerability. Please contact Unitronics customer support for more information.
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.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open attachments in unsolicited email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploitation specifically targeting these vulnerabilities has
been reported to CISA at this time.
5. UPDATE HISTORY
o April 18, 2024: Initial Publication
This product is provided subject to this Notification and this Privacy & Use
policy.
Vendor
Unitronics
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