CVE-2018-5400 — The Auto-Maskin products utilize an undocumented custom protocol to set up Modbu

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 4444

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
Auto-Maskin	DCU	210E — 3.7
Auto-Maskin	RP	210E — 3.7
Auto-Maskin	Marine Pro Observer Android App	0.1

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-10-08T15:00:00.000Z
• Last modified: 2024-09-16T18:08:45.736Z

09References

• www.kb.cert.org — https://www.kb.cert.org/vuls/id/176301
• www.us-cert.gov — https://www.us-cert.gov/ics/advisories/icsa-20-051-04