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:	2023-12-12
Current Version:	V1.0
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

Affected Product and Versions	Remediation
SINUMERIK MC All versions	Currently no fix is available See recommendations from section Workarounds and Mitigations
SINUMERIK ONE All versions	Currently no fix is available 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:

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

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 CLASSIFICATION

Un-/Collapse All

The vulnerability classification has been performed by using the CVSS scoring system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS environmental score is specific to the customer’s environment and will impact the overall CVSS score. The environmental score should therefore be individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a community-developed list of common software security weaknesses. This serves as a common language and as a baseline for weakness identification, mitigation, and prevention efforts. A detailed list of CWE classes can be found at: https://cwe.mitre.org/.

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

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