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Moxa PT-7528 and PT-7828 Series Use of Hard-Coded Credentials (CVE-2020-6985)

critical Tenable OT Security Plugin ID 501581

Synopsis

The remote OT asset is affected by a vulnerability.

Description

In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, these devices use a hard-coded service code for access to the console.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

See Also

https://www.us-cert.gov/ics/advisories/icsa-20-056-03

Plugin Details

Severity: Critical

ID: 501581

Version: 1.5

Type: remote

Family: Tenable.ot

Published: 8/2/2023

Updated: 12/5/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2020-6985

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:moxa:pt-7528-8mst-16tx-4gsfp-wv-wv_firmware, cpe:/o:moxa:pt-7528-20mst-4tx-4gsfp-wv-wv_firmware, cpe:/o:moxa:pt-7528-8msc-16tx-4gsfp-hv_firmware, cpe:/o:moxa:pt-7528-24tx-wv-hv_firmware, cpe:/o:moxa:pt-7528-20mst-4tx-4gsfp-wv_firmware, cpe:/o:moxa:pt-7828-r-hv_firmware, cpe:/o:moxa:pt-7528-20mst-4tx-4gsfp-hv-hv_firmware, cpe:/o:moxa:pt-7528-24tx-hv_firmware, cpe:/o:moxa:pt-7828-f-hv-hv_firmware, cpe:/o:moxa:pt-7528-12mst-12tx-4gsfp-hv-hv_firmware, cpe:/o:moxa:pt-7528-16mst-8tx-4gsfp-wv_firmware, cpe:/o:moxa:pt-7528-20msc-4tx-4gsfp-wv-wv_firmware, cpe:/o:moxa:pt-7528-16mst-8tx-4gsfp-hv-hv_firmware, cpe:/o:moxa:pt-7528-16msc-8tx-4gsfp-wv_firmware, cpe:/o:moxa:pt-7828-f-48_firmware, cpe:/o:moxa:pt-7528-16msc-8tx-4gsfp-hv-hv_firmware, cpe:/o:moxa:pt-7528-16mst-8tx-4gsfp-hv_firmware, cpe:/o:moxa:pt-7828-f-24-24_firmware, cpe:/o:moxa:pt-7528-8ssc-16tx-4gsfp-hv-hv_firmware, cpe:/o:moxa:pt-7528-8mst-16tx-4gsfp-wv_firmware, cpe:/o:moxa:pt-7528-12msc-12tx-4gsfp-wv_firmware, cpe:/o:moxa:pt-7528-8ssc-16tx-4gsfp-wv-wv_firmware, cpe:/o:moxa:pt-7528-16msc-8tx-4gsfp-hv_firmware, cpe:/o:moxa:pt-7528-20msc-4tx-4gsfp-hv_firmware, cpe:/o:moxa:pt-7528-12mst-12tx-4gsfp-hv_firmware, cpe:/o:moxa:pt-7828-f-24_firmware, cpe:/o:moxa:pt-7828-r-hv-hv_firmware, cpe:/o:moxa:pt-7528-24tx-wv-wv_firmware, cpe:/o:moxa:pt-7528-16mst-8tx-4gsfp-wv-wv_firmware, cpe:/o:moxa:pt-7828-r-48_firmware, cpe:/o:moxa:pt-7528-20msc-4tx-4gsfp-hv-hv_firmware, cpe:/o:moxa:pt-7528-8msc-16tx-4gsfp-wv_firmware, cpe:/o:moxa:pt-7528-12msc-12tx-4gsfp-hv_firmware, cpe:/o:moxa:pt-7828-f-48-hv_firmware, cpe:/o:moxa:pt-7828-f-hv_firmware, cpe:/o:moxa:pt-7828-r-24-24_firmware, cpe:/o:moxa:pt-7828-r-48-hv_firmware, cpe:/o:moxa:pt-7528-8msc-16tx-4gsfp-hv-hv_firmware, cpe:/o:moxa:pt-7528-20mst-4tx-4gsfp-hv_firmware, cpe:/o:moxa:pt-7528-24tx-hv-hv_firmware, cpe:/o:moxa:pt-7528-24tx-wv_firmware, cpe:/o:moxa:pt-7528-8mst-16tx-4gsfp-hv-hv_firmware, cpe:/o:moxa:pt-7528-12msc-12tx-4gsfp-wv-wv_firmware, cpe:/o:moxa:pt-7528-16msc-8tx-4gsfp-wv-wv_firmware, cpe:/o:moxa:pt-7528-8mst-16tx-4gsfp-hv_firmware, cpe:/o:moxa:pt-7528-8msc-16tx-4gsfp-wv-wv_firmware, cpe:/o:moxa:pt-7528-12mst-12tx-4gsfp-wv-wv_firmware, cpe:/o:moxa:pt-7828-f-48-48_firmware, cpe:/o:moxa:pt-7528-12mst-12tx-4gsfp-wv_firmware, cpe:/o:moxa:pt-7828-f-24-hv_firmware, cpe:/o:moxa:pt-7528-12msc-12tx-4gsfp-hv-hv_firmware, cpe:/o:moxa:pt-7828-r-24-hv_firmware, cpe:/o:moxa:pt-7528-20msc-4tx-4gsfp-wv_firmware, cpe:/o:moxa:pt-7828-r-24_firmware, cpe:/o:moxa:pt-7828-r-48-48_firmware

Required KB Items: Tenable.ot/Moxa

Exploit Ease: No known exploits are available

Patch Publication Date: 3/24/2020

Vulnerability Publication Date: 3/24/2020

Reference Information

CVE: CVE-2020-6985

CWE: 798

ICSA: 20-056-03