Siemens Desigo PXC Improper Authentication (CVE-2018-4834)

critical Tenable OT Security Plugin ID 500747

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in Desigo Automation Controllers Products and Desigo Operator Unit PXM20-E. A remote attacker with network access to the device could potentially upload a new firmware image to the devices without prior authentication.

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.

Siemens has provided updated versions that fix the vulnerability for the affected products. Siemens recommends users update to version v4.10.111, v5.00.171, v5.10.069, or v6.00.204 or later. Updates can be obtained from Siemens customer support or a local partner.

As a general security measure, Siemens strongly recommends protecting network access to the devices with appropriate mechanisms. Siemens advises configuring the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment.

https://www.siemens.com/cert/operational-guidelines-industrial-security

For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-824231 at the following location:

http://www.siemens.com/cert/en/cert-security-advisories.htm

Plugin Details

Severity: Critical

ID: 500747

Version: 1.5

Type: remote

Family: Tenable.ot

Published: 1/25/2023

Updated: 3/4/2024

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-2018-4834

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:siemens:pxc001-e.d_firmware, cpe:/o:siemens:pxm20-e_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 1/24/2018

Vulnerability Publication Date: 1/24/2018

Reference Information

CVE: CVE-2018-4834

CWE: 434

Detections

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