Rockwell Automation Micro800 and MicroLogix 1400 Channel Accessible By Non-Endpoint (CVE-2021-32926)

high Tenable OT Security Plugin ID 500456

Synopsis

The remote OT asset is affected by a vulnerability.

Description

When an authenticated password change request takes place, this vulnerability could allow the attacker to intercept the message that includes the legitimate, new password hash and replace it with an illegitimate hash. The user would no longer be able to authenticate to the controller (Micro800: All versions, MicroLogix 1400: Version 21 and later) causing a denial-of-service condition

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

Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Rockwell recommends confirming that setting and updating the password for the controller is done within a trusted network environment.

If this vulnerability is successfully exploited, the password can be reset by performing a firmware flash on the controller. Firmware flashing will put the controller into the default state and the user program and data will be lost.

A comprehensive defense-in-depth strategy can reduce the risk of this vulnerability. To leverage the vulnerability, an unauthorized user would require access to the same network as the controller. Users should confirm they are employing proper networking segmentation and security controls.

Users can refer to the Converged Plantwide Ethernet (CPwE) Design and Implementation Guide for best practices for deploying network segmentation and broader defense-in-depth strategies. Users can also refer to the Rockwell Automation System Security Design Guidelines on how to use Rockwell Automation products to improve the security of their industrial automation systems.

For more information see Rockwell Automation Security Advisory (login required).

Plugin Details

Severity: High

ID: 500456

Version: 1.11

Type: remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 3/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2021-32926

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/o:rockwellautomation:micro810_firmware, cpe:/o:rockwellautomation:micro820_firmware, cpe:/o:rockwellautomation:micro830_firmware, cpe:/o:rockwellautomation:micro850_firmware, cpe:/o:rockwellautomation:micro870_firmware, cpe:/o:rockwellautomation:micrologix_1400_firmware

Required KB Items: Tenable.ot/Rockwell

Exploit Ease: No known exploits are available

Patch Publication Date: 6/3/2021

Vulnerability Publication Date: 6/3/2021

Reference Information

CVE: CVE-2021-32926

CWE: 300

Detections

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