Siemens SIMATIC S7-200 SMART Devices Uncontrolled Resource Consumption (CVE-2024-43647)

high Tenable OT Security Plugin ID 502482

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Affected devices do not properly handle TCP packets with an incorrect structure. This could allow an unauthenticated remote attacker to cause a denial of service condition. To restore normal operations, the network cable of the device needs to be unplugged and re-plugged.

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 identified the following specific workarounds and mitigations that users can apply to reduce the risk:

- Limit network access to trusted users and systems only

Please use the following General Security Recommendations:

As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens' operational guidelines for Industrial Security, and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found here.

For further inquiries on security vulnerabilities in Siemens products and solutions, please view contact the Siemens ProductCERT

For more information see the associated Siemens security advisory SSA-969738 in HTML and CSAF.

Plugin Details

Severity: High

ID: 502482

Version: 1.4

Type: remote

Family: Tenable.ot

Published: 10/8/2024

Updated: 12/12/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.8

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:P/RL:T/RC:C

Vulnerability Information

CPE: cpe:/o:siemens:simatic_s7-200_smart_cpu_st60_firmware, cpe:/o:siemens:simatic_s7-200_smart_cpu_sr60_firmware, cpe:/o:siemens:simatic_s7-200_smart_cpu_st20_firmware, cpe:/o:siemens:simatic_s7-200_smart_cpu_sr40_firmware, cpe:/o:siemens:simatic_s7-200_smart_cpu_cr40_firmware, cpe:/o:siemens:simatic_s7-200_smart_cpu_sr20_firmware, cpe:/o:siemens:simatic_s7-200_smart_cpu_st30_firmware, cpe:/o:siemens:simatic_s7-200_smart_cpu_sr30_firmware, cpe:/o:siemens:simatic_s7-200_smart_cpu_st40_firmware, cpe:/o:siemens:simatic_s7-200_smart_cpu_cr60_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/10/2024

Vulnerability Publication Date: 9/10/2024

Reference Information

CVE: CVE-2024-43647

CWE: 400

ICSA: 24-261-01

Detections

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