CVE-2024-38281: Motorola Vigilant LPR Auth Bypass Flaw

CVE-2024-38281 Overview

CVE-2024-38281 is a hardcoded credentials vulnerability [CWE-798] in the Motorola Vigilant Fixed License Plate Reader (LPR) Coms Box. The device exposes a hidden wireless network that accepts a static, embedded credential pair. An attacker within wireless range can authenticate to the maintenance console using these credentials and gain administrative access to the device.

Critical Impact

Adjacent-network attackers can read sensitive license plate data, manipulate device configuration, and pivot into operational law-enforcement infrastructure using credentials that cannot be changed by the operator.

Affected Products

• Motorola Vigilant Fixed LPR Coms Box (hardware)
• Motorola Vigilant Fixed LPR Coms Box Firmware (all versions prior to vendor remediation)
• Deployments referenced in CISA ICS Advisory ICSA-24-165-19

Discovery Timeline

• 2024-06-13 - CVE-2024-38281 published to the National Vulnerability Database
• 2024-06-13 - CISA released ICS Advisory ICSA-24-165-19
• 2024-11-21 - Last updated in the NVD database

Technical Details for CVE-2024-38281

Vulnerability Analysis

The Motorola Vigilant Fixed LPR Coms Box ships with a hidden Wi-Fi access point that is enabled by default. The access point is reachable by any wireless client within radio range of the deployed unit. Authentication to this hidden network, and to the maintenance console it exposes, relies on credentials baked into the firmware image.

Because the credentials are static and identical across units, compromise of a single device exposes the entire fleet. The maintenance console grants configuration and diagnostic privileges over the LPR system. This enables an attacker to alter capture behavior, exfiltrate plate-read history, or disable the device without leaving conventional network-perimeter traces.

The weakness is classified under [CWE-798] Use of Hard-coded Credentials. Operators cannot rotate or revoke the credentials without a firmware update from the vendor.

Root Cause

The firmware embeds a fixed Service Set Identifier (SSID) and authentication secret used to bring up an out-of-band maintenance radio. The design assumes the hidden SSID is sufficient obscurity. Wireless beaconing and probe-response behavior, however, reveal the network to standard wireless discovery tooling.

Attack Vector

Exploitation requires only adjacent-network access. An attacker positions a wireless client within range of the deployed LPR unit, identifies the hidden SSID through passive monitoring or active probing, and authenticates with the embedded credentials. No prior account, social engineering, or user interaction on the device is required beyond low-privilege access to the wireless layer.

The vulnerability mechanism is described in the CISA ICS Advisory ICSA-24-165-19. No public proof-of-concept exploit code is available at the time of writing.

Detection Methods for CVE-2024-38281

Indicators of Compromise

• Unexpected wireless association events on the LPR Coms Box, particularly outside scheduled maintenance windows.
• Authentication entries in the maintenance console log originating from unknown MAC addresses.
• Configuration changes to capture rules, upload destinations, or retention parameters that were not initiated by an authorized operator.
• Outbound network connections from the LPR unit to destinations outside the documented backend.

Detection Strategies

• Perform on-site wireless surveys around each deployed unit to confirm whether the hidden SSID is broadcasting or responding to probes.
• Compare baseline firmware configurations against running configurations at regular intervals to detect tampering.
• Forward maintenance console authentication logs to a centralized log platform and alert on any successful login.

Monitoring Recommendations

• Continuously monitor the radio environment around fixed LPR installations using a wireless intrusion detection sensor.
• Capture and review NetFlow or equivalent telemetry from the wired uplink for anomalous egress.
• Track device health beacons; sudden outages or reboots may indicate an attacker manipulating the maintenance interface.

How to Mitigate CVE-2024-38281

Immediate Actions Required

• Contact Motorola Solutions support to obtain remediated firmware and apply it to every deployed Vigilant Fixed LPR Coms Box.
• Where physically possible, disable the maintenance wireless radio until patched firmware is installed.
• Restrict physical and radio access to deployed units by relocating antennas or adding RF shielding where feasible.
• Inventory all Vigilant Fixed LPR Coms Box units and confirm firmware versions against the vendor's fixed release.

Patch Information

Motorola Solutions provides updated firmware through its support channels. Refer to CISA ICS Advisory ICSA-24-165-19 for the vendor coordination details and follow Motorola's instructions for verifying the firmware version after update.

Workarounds

• Place LPR Coms Box units in locations that minimize wireless reach beyond physically controlled perimeters.
• Monitor the surrounding RF spectrum for unauthorized clients probing the hidden SSID and treat any association attempt as a security event.
• Segment the wired network behind each LPR unit so that a compromised device cannot reach broader law-enforcement or municipal networks.
• Maintain a documented incident response plan for suspected device compromise, including firmware reflash and credential rotation once patched firmware permits it.

# Operational checks for fleet validation
# 1. Wireless survey from a controlled client (example using iw)
sudo iw dev wlan0 scan | grep -E "SSID|signal|BSS"

# 2. Verify firmware version reported by each device matches the
#    fixed release advised by Motorola Solutions support.
# 3. Log all maintenance console authentications to a central SIEM.