Siemens InsydeH2O SMM Privilege Escalation (CVE-2021-43323)

high Tenable OT Security Plugin ID 501690

Synopsis

The remote OT asset is affected by a vulnerability.

Description

An issue was discovered in UsbCoreDxe in Insyde InsydeH2O with kernel 5.5 before 05.51.45, 5.4 before 05.43.45, 5.3 before 05.35.45, 5.2 before 05.26.45, 5.1 before 05.16.45, and 5.0 before 05.08.45. An SMM callout vulnerability allows an attacker to hijack execution flow of code running in System Management Mode. Exploiting this issue could lead to escalating privileges to SMM.

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

Refer to the vendor advisory.

Plugin Details

Severity: High

ID: 501690

Version: 1.1

Type: remote

Family: Tenable.ot

Published: 9/26/2023

Updated: 9/27/2023

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2021-43323

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

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

Vulnerability Information

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

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 2/3/2022

Vulnerability Publication Date: 2/3/2022

Reference Information

CVE: CVE-2021-43323

Detections

Analytics