SSA-969738

Siemens Security Advisory by Siemens ProductCERT

SSA-969738: Denial of Service Vulnerability in SIMATIC S7-200 SMART Devices

Publication Date:	2024-09-10
Last Update:	2024-09-10
Current Version:	V1.0
CVSS v3.1 Base Score:	7.5
CVSS v4.0 Base Score:	8.7

SUMMARY

A vulnerability in SIMATIC S7-200 SMART devices could allow an attacker to cause a denial of service condition if a specially crafted TCP packet is sent to the device.

Siemens recommends specific countermeasures for products where fixes are not, or not yet available.

AFFECTED PRODUCTS AND SOLUTION

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Affected Product and Versions	Remediation
SIMATIC S7-200 SMART CPU family	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU CR40 (6ES7288-1CR40-0AA0) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU CR60 (6ES7288-1CR60-0AA0) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU SR20 (6ES7288-1SR20-0AA0) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU SR20 (6ES7288-1SR20-0AA1) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU SR30 (6ES7288-1SR30-0AA0) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU SR30 (6ES7288-1SR30-0AA1) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU SR40 (6ES7288-1SR40-0AA0) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU SR40 (6ES7288-1SR40-0AA1) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU SR60 (6ES7288-1SR60-0AA0) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU SR60 (6ES7288-1SR60-0AA1) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU ST20 (6ES7288-1ST20-0AA0) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU ST20 (6ES7288-1ST20-0AA1) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU ST30 (6ES7288-1ST30-0AA0) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU ST30 (6ES7288-1ST30-0AA1) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU ST40 (6ES7288-1ST40-0AA0) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU ST40 (6ES7288-1ST40-0AA1) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU ST60 (6ES7288-1ST60-0AA0) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIMATIC S7-200 SMART CPU ST60 (6ES7288-1ST60-0AA1) All versions affected by CVE-2024-43647	Currently no fix is planned See recommendations from section Workarounds and Mitigations

WORKAROUNDS AND MITIGATIONS

Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk:

Limit network access to trusted users and systems only

Please follow the General Security Recommendations.

GENERAL SECURITY RECOMMENDATIONS

As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity

PRODUCT DESCRIPTION

The S7-200 SMART series is a line of micro-programmable logic controllers that can control a variety of small automation applications.

VULNERABILITY DESCRIPTION

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This chapter describes all vulnerabilities (CVE-IDs) addressed in this security advisory. Wherever applicable, it also documents the product-specific impact of the individual vulnerabilities.

Vulnerability CVE-2024-43647

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.

CVSS v3.1 Base Score	7.5
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:T/RC:C
CVSS v4.0 Base Score	8.7
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE	CWE-400: Uncontrolled Resource Consumption

ADDITIONAL INFORMATION

For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories

HISTORY DATA

V1.0 (2024-09-10):

Publication Date

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