SSA-280603

Siemens Security Advisory by Siemens ProductCERT

SSA-280603: Denial of Service Vulnerability in SINUMERIK ONE and SINUMERIK MC

Publication Date:	2023-12-12
Last Update:	2024-09-10
Current Version:	V1.1
CVSS v3.1 Base Score:	7.5

SUMMARY

A vulnerability has been identified in the integrated S7-1500 CPU of SINUMERIK ONE and SINUMERIK MC products that could allow an attacker to cause a denial of service condition. In order to exploit the vulnerability, an attacker must have access to the affected devices on port 102/tcp.

Siemens is preparing updates and recommends specific countermeasures for products where updates are not, or not yet available.

Note: The affected integrated S7-1500 CPUs and related products are advised in [1].

[1] https://cert-portal.siemens.com/productcert/html/ssa-592380.html

AFFECTED PRODUCTS AND SOLUTION

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Affected Product and Versions	Remediation
SINUMERIK MC All versions < V1.24 affected by CVE-2023-46156	Update to V1.24 or later version Updated software version can be obtained from Siemens customer support or a local partner. See further recommendations from section Workarounds and Mitigations
SINUMERIK ONE All versions < V6.24 affected by CVE-2023-46156	Update to V6.24 or later version Updated software version can be obtained from Siemens customer support or a local partner. See further 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:

Expose port 102/tcp of the integrated S7-1500 CPU only to trusted network environments

Product-specific remediations or mitigations can be found in the section Affected Products and Solution.
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

SINUMERIK MC is a CNC system for customized machine solutions.

SINUMERIK ONE is a digital-native CNC system with an integrated SIMATIC S7-1500 CPU for automation.

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-2023-46156

Affected devices improperly handle specially crafted packets sent to port 102/tcp. This could allow an attacker to create a denial of service condition. A restart is needed to restore normal operations.

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:O/RC:C
CWE	CWE-416: Use After Free

ACKNOWLEDGMENTS

Siemens thanks the following parties for their efforts:

Maurice Joren for reporting and coordinated disclosure
Yu Cong for reporting and coordinated disclosure

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 (2023-12-12):	Publication Date
V1.1 (2024-09-10):	Added fix for SINUMERIK ONE and SINUMERIK MC

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