Siemens InsydeH2O Improper Input Validation (CVE-2023-27373)

medium Tenable OT Security Plugin ID 501729

Synopsis

The remote OT asset is affected by a vulnerability.

Description

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. Due to insufficient input validation, an attacker can tamper with a runtime-accessible EFI variable to cause a dynamic BAR setting to overlap SMRAM.

Insyde BIOS is typically used in RUGGEDCOM APE products and some SIMATIC devices. Please refer to the vendor advisory for a precise list of models concerned.

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 released BIOS update V1.0.212N for the affected products and recommends updating to the latest version.

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following recommendations in the product manuals.

Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage

For more information see the associated Siemens security advisory SSA-957369 in HTML and CSAF.

Plugin Details

Severity: Medium

ID: 501729

File Name: tenable_ot_siemens_CVE-2023-27373.nasl

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 9/26/2023

Updated: 2/14/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2023-27373

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

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

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

Vulnerability Information

CPE: cpe:/a:insyde:insydeh2o:5.4, cpe:/a:insyde:insydeh2o:5.2, cpe:/a:insyde:insydeh2o:5.0, cpe:/a:insyde:insydeh2o:5.1, cpe:/a:insyde:insydeh2o:5.3, cpe:/a:insyde:insydeh2o:5.5

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 8/7/2023

Vulnerability Publication Date: 8/7/2023

Reference Information

CVE: CVE-2023-27373

CWE: 20

ICSA: 23-257-04

Detections

Analytics