Siemens LOGO! Missing Authentication For Critical Function (CVE-2020-7589)

critical Tenable OT Security Plugin ID 501671

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in LOGO! 8 BM (incl. SIPLUS variants) (All versions). The vulnerability could lead to an attacker reading and modifying the device configuration and obtain project files from affected devices. The security vulnerability could be exploited by an unauthenticated attacker with network access to port 135/tcp. No user interaction is required to exploit this security vulnerability. The vulnerability impacts confidentiality, integrity, and availability of the device. At the time of advisory publication no public exploitation of this security vulnerability was known.

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 recommends applying defense-in-depth concepts, including the protection concept outlined in the system manual.

Starting with Version 8.3 of LOGO! 8 BM, Port 135/TCP can be disabled. It is recommended to disable this port when possible.

Siemens recommends following their general security recommendations. As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to the Siemens operational guidelines for Industrial Security and following the recommendations in the product manuals.

For additional information, please refer to Siemens Security Advisory SSA-817401

Plugin Details

Severity: Critical

ID: 501671

Version: 1.5

Type: remote

Family: Tenable.ot

Published: 9/21/2023

Updated: 9/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2020-7589

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

Vulnerability Information

CPE: cpe:/o:siemens:logo%21_8_bm_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 6/10/2020

Vulnerability Publication Date: 6/10/2020

Reference Information

CVE: CVE-2020-7589

CWE: 306

ICSA: 20-161-03

Detections

Analytics