title: 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
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.
problem types: CWE-346: Origin Validation Error
affected:
{
platforms: ARMv7
product: DCU-210E
vendor: Auto-Maskin
versions:
lessThan: 3.7, status: affected, version: 3.7, versionType: custom
}
{
platforms: ARMv7
product: RP-210E
vendor: Auto-Maskin
versions:
lessThan: 3.7, status: affected, version: 3.7, versionType: custom
}
{
platforms: android
product: Marine Pro Observer Android App
vendor: Auto-Maskin
versions:
status: unknown, version: 0.1
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 9.1
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
version: 3.0
]
solutions: The devices should implement Modbus TCP Security Protocol (v21, 2018) per Modbus specifications over port 802 TCP, for Modbus TCP with encryption and authentication.