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LOYTEC Electronics LINX Series

Plan Patch8.2ICS-CERT ICSA-24-247-01Sep 3, 2024
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

LOYTEC LINX Series building automation controllers contain multiple vulnerabilities in HTTP communication and firmware verification that allow attackers to disclose sensitive information (credentials, configuration data) or modify device settings without authentication. Affected products include LINX-151, LINX-212, LVIS-3ME12-A1, LIOB-586, LIOB-580 V2, LIOB-588, and L-INX Configurator software across all versions. Vulnerabilities include unencrypted transmission of sensitive data (CWE-319), missing authentication (CWE-306), unencrypted storage of credentials (CWE-312), and improper access control on configuration files (CWE-284).

What this means
What could happen
An attacker could read sensitive configuration data (credentials, setpoints) from LOYTEC building automation controllers or modify device settings and firmware, disrupting HVAC, lighting, or energy management operations in buildings.
Who's at risk
Building automation operators and facilities managers using LOYTEC LINX series controllers (LINX-151, LINX-212, LVIS-3ME12-A1, LIOB series devices, and L-INX Configurator software) for HVAC, lighting, and energy management should be aware that these devices have multiple unpatched vulnerabilities allowing credential theft and unauthorized modifications.
How it could be exploited
An attacker on the network sends unencrypted HTTP requests to the LOYTEC device to access registry and configuration files (CVE-2023-46380, 46382, 46383, 46385), or uploads malicious firmware without proper signature verification (CVE-2023-46381, 46384, 46386, 46388, 46389). No authentication is required for the HTTP-based vulnerabilities.
Prerequisites
  • Network access to the LOYTEC device on the HTTP port (typically 80)
  • LOYTEC device must have HTTP enabled (default configuration)
  • For firmware modification exploits: ability to reach the firmware upload interface
remotely exploitableno authentication required for HTTP-based exploitslow complexityno patch available for affected productsaffects building critical infrastructure (HVAC/lighting)
Exploitability
Low exploit probability (EPSS 0.5%)
Affected products (7)
7 with fix
ProductAffected VersionsFix Status
LINX-151: vers:all/*All versions8.2.8
LINX-212: vers:all/*All versions8.2.8
LVIS-3ME12-A1: vers:all/*All versions8.2.8
LIOB-586: vers:all/*All versions8.2.8
LIOB-580 V2: vers:all/*All versions8.2.8
LIOB-588: vers:all/*All versions8.2.8
L-INX Configurator: vers:all/*All versions8.2.8
Remediation & Mitigation
0/5
Do now
0/1
WORKAROUNDDisable HTTP protocol on all LOYTEC devices and use HTTPS only
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate all affected LOYTEC products to firmware version 8.2.8 or later
Long-term hardening
0/3
HARDENINGSegment building automation networks from business networks using firewalls
HARDENINGRestrict network access to LOYTEC devices to authorized engineering workstations and control systems only
HARDENINGMonitor for unauthorized firmware uploads and configuration file access attempts
View full CISA ICS-CERT advisory
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