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

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

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.

Category

9.1
CVSS
Severity: Critical
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.11%
Third-Party Advisory cert.org
Affected: Auto-Maskin DCU-210E
Affected: Auto-Maskin RP-210E
Affected: Auto-Maskin Marine Pro Observer Android App
Published at:
Updated at:

References

Link Tags
https://www.kb.cert.org/vuls/id/176301 third party advisory us government resource
https://www.us-cert.gov/ics/advisories/icsa-20-051-04

Frequently Asked Questions

What is the severity of CVE-2018-5400?
CVE-2018-5400 has been scored as a critical severity vulnerability.
How to fix CVE-2018-5400?
To fix CVE-2018-5400: The devices should implement Modbus TCP Security Protocol (v21, 2018) per Modbus specifications over port 802 TCP, for Modbus TCP with encryption and authentication.
Is CVE-2018-5400 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-5400 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-5400?
CVE-2018-5400 affects Auto-Maskin DCU-210E, Auto-Maskin RP-210E, Auto-Maskin Marine Pro Observer Android App.
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