AFFECTED PRODUCTS AND SOLUTION

Affected Product and Versions	Remediation
RUGGEDCOM RM1224: All versions < V6.4	Update to V6.4 or later version https://support.industry.siemens.com/cs/ww/en/view/109794349/
SCALANCE M-800: All versions < V6.4	Update to V6.4 or later version https://support.industry.siemens.com/cs/ww/en/view/109794349/
SCALANCE S615: All versions < V6.4	Update to V6.4 or later version https://support.industry.siemens.com/cs/ww/en/view/109794349/
SCALANCE SC-600: All versions < V2.1.3	Update to V2.1.3 or later version https://support.industry.siemens.com/cs/ww/en/view/109793041/
SCALANCE W1750D: All versions	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:

• SCALANCE M-800: Disable DNS proxy in the device configuration (System - DNS - DNS Proxy - Disable Checkbox „Enable DNS Proxy“), and configure the connected devices in the internal network to use a different DNS server. Note that the DNS proxy is enabled by default.
• RUGGEDCOM RM1224: Same as for SCALANCE M-800. Note that the DNS proxy is enabled by default.
• SCALANCE S615: Same as for SCALANCE M-800. Note that the DNS proxy is disabled by default.
• SCALANCE SC-600: Same as for SCALANCE M-800. Note that the DNS proxy is disabled by default.
• SCALANCE W1750D: If “OpenDNS”, “Captive Portal” or “URL redirection” functionality is not used, deploy firewall rules in the device configuration to block incoming access to port 53/UDP

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

RUGGEDCOM RM1224 is a 4G ROUTER for wireless IP-communication from Ethernet based devices via LTE(4G)- mobile radio.

The SCALANCE M-800 / S615 industrial routers are used for secure remote access to plants via mobile networks, e.g. GPRS or UMTS with the integrated security functions of a firewall for protection against unauthorized access and VPN to protect data transmission.

The SCALANCE SC-600 devices (SC622-2C, SC632-2C, SC636-2C, SC642-2C, SC646-2C) are used to protect trusted industrial networks from untrusted networks. They allow filtering incoming and outgoing network connections in different ways.

The SCALANCE W1750D controller-based Direct Access Points support radio transmission according to the latest IWLAN standard IEEE 802.11ac Wave 2.

VULNERABILITY CLASSIFICATION

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/.

ACKNOWLEDGMENTS

Siemens thanks the following parties for their efforts:

• Moshe Kol and Shlomi Oberman from JSOF for coordinated disclosure
• CERT Coordination Center (CERT/CC) for coordination efforts
• Industrial Control System Cyber Emergency Response Team (ICS-CERT) for coordination efforts

ADDITIONAL INFORMATION

For more details regarding the DNSpooq vulnerabilities in dnsmasq refer to:

• JSOF Publication “DNSpooq”

• CERT/CC Advisory VU#434904

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 (2021-01-19): Publication Date

V1.1 (2021-03-09): Added solution for SCALANCE SC-600

V1.2 (2021-04-13): Added solution for SCALANCE M-800/S615 and RUGGEDCOM RM1224

V1.3 (2021-05-11): Clarified that a solution for SCALANCE W1750D is not expected

TERMS OF USE

Siemens Security Advisories are subject to the terms and conditions contained in Siemens’ underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter "License Terms"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens’ Global Website https://new.siemens.com/terms_of_use, hereinafter "Terms of Use"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.