CVE-2018-5400 Missing authorization in DCU-210E

Critical 9.1 Published 8 Oct 2018 Updated 16 Sep 2024

Attackers on the local network can spoof devices to establish unauthorized Modbus connections and send arbitrary commands to industrial controllers.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-5400?

CVE-2018-5400 is a critical missing authorization vulnerability in Auto-Maskin DCU-210E, published on 8 Oct 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-346

Which versions are affected by CVE-2018-5400?

It affects 2 products.

Products include Auto-Maskin Dcu 210e Firmware, Auto-Maskin Rp 210e Firmware.

How do I fix CVE-2018-5400?

No fix has been published for CVE-2018-5400 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2018-5400 being exploited?

There is no known exploitation of CVE-2018-5400 in the wild and no public exploit code.

Sources

Also known as GHSA-hmx9-h7xx-529h.