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.
The following versions of Unitronics Vision Legacy series PLCs are affected:
Unitronics Vision Legacy series 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).
Reid Wightman of Dragos reported this vulnerability to CISA.
Unitronics recommends users to:
Please follow Unitronics published recommendations or contact Unitronics technical support for more information.
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.
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:
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:
No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-1480
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-1480
cwe.mitre.org/data/definitions/257.html
github.com/cisagov/CSAF
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www.cisa.gov/resources-tools/resources/ics-recommended-practices
www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf
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