CVE-2018-5400

The Auto-Maskin DCU 210E, RP-210E, and Marine Pro Observer Android App utilize an undocumented custom protocol to set up Modbus communications with other devices without validating those devices, resulting in an origin validation error

Published Oct 8, 2018 CVSS 3.0 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
The Auto-Maskin products utilize an undocumented custom protocol to set up Modbus communications with other devices without validating those devices. The originating device sends a message in plaintext, 48:65:6c:6c:6f:20:57:6f:72:6c:64, "Hello World" over UDP ports 44444-44446 to the broadcast address for the LAN. Without verification devices respond to any of these broadcast messages on the LAN with a plaintext reply over UDP containing the device model and firmware version. Following this exchange the devices allow Modbus transmissions between the two devices on the standard Modbus port 502 TCP. Impact: An attacker can exploit this vulnerability to send arbitrary messages to any DCU or RP device through spoofing or replay attacks as long as they have access to the network. Affected releases are Auto-Maskin DCU-210E RP-210E: Versions prior to 3.7 on ARMv7.

Remediation

Vendor Solution

The devices should implement Modbus TCP Security Protocol (v21, 2018) per Modbus specifications over port 802 TCP, for Modbus TCP with encryption and authentication.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2018-17170 The Auto-Maskin products utilize an undocumented custom protocol to set up Modbus communications with other devices without validating those devices. The originating device sends a message in plaintext, 48:65:6c:6c:6f:20:57:6f:72:6c:64, "Hello World" over UDP ports 44444-44446 to the broadcast address for the LAN. Without verification devices respond to any of these broadcast messages on the LAN with a plaintext reply over UDP containing the device model and firmware version. Following this exchange the devices allow Modbus transmissions between the two devices on the standard Modbus port 502 TCP. Impact: An attacker can exploit this vulnerability to send arbitrary messages to any DCU or RP device through spoofing or replay attacks as long as they have access to the network. Affected releases are Auto-Maskin DCU-210E RP-210E: Versions prior to 3.7 on ARMv7.
History

No history.

Weaknesses

Sources

Status
PUBLISHED
Assigner
certcc
Published
Updated
Sep 16, 2024, 6:08 PM
Reserved
Jan 12, 2018, 12:00 AM
Status
Modified
Published
Oct 8, 2018, 3:29 PM
Modified
Jun 17, 2026, 2:00 AM