PatchSiren cyber security CVE debrief

CVE-2023-46383 LOYTEC electronics GmbH CVE debrief

LOYTEC electronics GmbH LINX Configurator 7.4.10 transmits authentication credentials using HTTP Basic Authentication, which encodes usernames and passwords in base64—a reversible encoding that provides no cryptographic protection. Remote attackers positioned to intercept network traffic can capture these credentials and obtain full administrative control over affected LOYTEC device configurations. The vulnerability affects seven product variants across the LINX series, LVIS, and LIOB product families. CISA published this advisory on September 3, 2024, as ICSA-24-247-01. The vendor has released version 8.2.8 to address this issue and recommends disabling HTTP in accordance with their security hardening guidance.

Vendor: LOYTEC electronics GmbH
Product: LINX-151
CVSS: HIGH 7.5
CISA KEV: Not listed in stored evidence
Original CVE published: 2024-09-03
Original CVE updated: 2024-09-03
Advisory published: 2024-09-03
Advisory updated: 2024-09-03

Who should care

Organizations operating LOYTEC building automation, HVAC control, or industrial IoT systems; OT security teams managing LINX-151, LINX-212, LVIS-3ME12-A1, LIOB-586, LIOB-580 V2, or LIOB-588 devices; facility managers with LOYTEC deployments; and critical infrastructure operators with LOYTEC components in their control networks.

Technical summary

The L-INX Configurator and related LOYTEC devices use HTTP Basic Authentication for administrative access. This authentication scheme transmits credentials encoded with base64, which is trivially reversible and provides no confidentiality protection. An attacker with network visibility to device management traffic can extract valid credentials and authenticate to the device configuration interface, gaining full control. The vulnerability is remotely exploitable without authentication and requires no user interaction.

Defensive priority

HIGH

Recommended defensive actions

Update affected LOYTEC devices to version 8.2.8 or later
Disable HTTP on affected LOYTEC devices per the vendor's security hardening guide
Implement network segmentation to limit exposure of LOYTEC device management interfaces
Monitor for unauthorized configuration changes on LOYTEC devices
Review and rotate credentials for affected devices if HTTP was previously enabled

Evidence notes

CISA CSAF advisory ICSA-24-247-01 identifies HTTP Basic Authentication as the vulnerable mechanism, with base64-encoded credential transmission enabling credential theft. CVSS 3.1 score of 7.5 (HIGH) reflects network attack vector, low attack complexity, and no required privileges or user interaction.

Official resources

2024-09-03