SSA-918992

Siemens Security Advisory by Siemens ProductCERT

SSA-918992: Unused HTTP Service on SENTRON 3KC ATC6 Ethernet Module

Publication Date:	2024-03-12
Last Update:	2024-03-12
Current Version:	V1.0
CVSS v3.1 Base Score:	7.5
CVSS v4.0 Base Score:	8.7

SUMMARY

SENTRON 3KC ATC6 Expansion Module Ethernet exposes an unused, unstable http service at port 80/tcp on the Modbus-TCP Ethernet, which could allow an attacker on the same Modbus network to create a denial of service condition that forces the device to reboot.

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

AFFECTED PRODUCTS AND SOLUTION

Affected Product and Versions	Remediation
SENTRON 3KC ATC6 Expansion Module Ethernet (3KC9000-8TL75) All versions affected by all CVEs CVE-2024-22044	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:

Restrict access to the Modbus-TCP network by blocking incoming connections to port 80/tcp, e.g. in a firewall

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

SENTRON 3KC ATC6x00 transfer control devices enable, in combination with motor-driven circuit breakers (ACB, MCCB) a transfer between main and alternative power sources.

VULNERABILITY DESCRIPTION

Un-/Collapse All

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-2024-22044

Affected devices expose an unused, unstable http service at port 80/tcp on the Modbus-TCP Ethernet. This could allow an attacker on the same Modbus network to create a denial of service condition that forces the device to reboot.

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
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-912: Hidden Functionality

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 (2024-03-12):

Publication Date

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