-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 # SSA-324955: SAD DNS Attack in Linux Based Products Publication Date: 2021-05-11 Last Update: 2023-03-14 Current Version: 2.0 CVSS v3.1 Base Score: 7.4 SUMMARY ======= A vulnerability made public under the name SAD DNS affects Domain Name System resolvers due to a vulnerability in the Linux kernel when handling ICMP packets. The Siemens products which are affected are listed below. For more information please see https://www.saddns.net/. Siemens has released updates for the affected products and recommends to update to the latest versions. AFFECTED PRODUCTS AND SOLUTION ============================== * RUGGEDCOM RM1224 family (6GK6108-4AM00) - Affected versions: All versions >= V5.0 and < V6.4 - Remediation: Update to V6.4 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109794349/ * SCALANCE M-800 family - Affected versions: All versions >= V5.0 and < V6.4 - Remediation: Update to V6.4 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109794349/ * SCALANCE S615 (6GK5615-0AA00-2AA2) - Affected versions: All versions >= V5.0 and < V6.4 - Remediation: Update to V6.4 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109794349/ * SCALANCE SC-600 family - Affected versions: All versions < V2.1.3 - Remediation: Update to V2.1.3 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109793041/ * SCALANCE W1750D - Affected versions: V8.3.0.1, V8.6.0 and V8.7.0 - Remediation: Update to V8.7.1.3 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/de/en/view/109802805/ * SIMATIC Cloud Connect 7 CC712 (6GK1411-1AC00) - Affected versions: All versions > V1.0 and < V1.6 - Remediation: Update to V1.6 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109803418/ * SIMATIC Cloud Connect 7 CC716 (6GK1411-5AC00) - Affected versions: All versions > V1.0 and < V1.6 - Remediation: Update to V1.6 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109803418/ * SIMATIC CP 1242-7 V2 (6GK7242-7KX31-0XE0) - Affected versions: All versions >= V3.1.39 < V3.3 - Remediation: Update to V3.3 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109799604/ * SIMATIC CP 1243-1 (6GK7243-1BX30-0XE0) - Affected versions: All versions >= V3.1.39 and < V3.3.46 - Remediation: Update to V3.3.46 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/us/en/view/109812218/ * SIMATIC CP 1243-7 LTE EU (6GK7243-7KX30-0XE0) - Affected versions: All versions >=V3.1.39 and < V3.3 - Remediation: Update to V3.3 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109799584/ * SIMATIC CP 1243-7 LTE US (6GK7243-7SX30-0XE0) - Affected versions: All versions >=V3.1.39 and < V3.3 - Remediation: Update to V3.3 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109799584/ * SIMATIC CP 1243-8 IRC (6GK7243-8RX30-0XE0) - Affected versions: All versions >= V3.1.39 and < V3.3.46 - Remediation: Update to V3.3.46 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/us/en/view/109812218/ * SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) - Affected versions: All versions >= V2.0 < V2.2.28 - Remediation: Update to V2.2.28 or later version See recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109817067/ * SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0) - Affected versions: All versions >= V2.0 < V2.2.28 - Remediation: Update to V2.2.28 or later version See recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109817067/ * SIMATIC CP 1543-1 (incl. SIPLUS variants) - Affected versions: All versions >= V2.2 and < V3.0 - Remediation: Update to V3.0 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109800773 * SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0) - Affected versions: All versions >= V2.0 < V2.2.28 - Remediation: Update to V2.2.28 or later version See recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109817067/ * SIMATIC CP 1545-1 (6GK7545-1GX00-0XE0) - Affected versions: All versions < V1.1 - Remediation: Update to V1.1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109811116/ * SIMATIC MV540 H (6GF3540-0GE10) - Affected versions: All versions < V3.1 - Remediation: Update to V3.1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/de/en/view/109804366 * SIMATIC MV540 S (6GF3540-0CD10) - Affected versions: All versions < V3.1 - Remediation: Update to V3.1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/de/en/view/109804366 * SIMATIC MV550 H (6GF3550-0GE10) - Affected versions: All versions < V3.1 - Remediation: Update to V3.1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/de/en/view/109804366 * SIMATIC MV550 S (6GF3550-0CD10) - Affected versions: All versions < V3.1 - Remediation: Update to V3.1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/de/en/view/109804366 * SIMATIC MV560 U (6GF3560-0LE10) - Affected versions: All versions < V3.1 - Remediation: Update to V3.1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/de/en/view/109804366 * SIMATIC MV560 X (6GF3560-0HE10) - Affected versions: All versions < V3.1 - Remediation: Update to V3.1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/de/en/view/109804366 * SINEMA Remote Connect Server - Affected versions: All versions < V3.0 SP1 - Remediation: Update to V3.0 SP1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109793790/ * SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0) - Affected versions: All versions >= V2.0 < V2.2.28 - Remediation: Update to V2.2.28 or later version See recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109817067/ * SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0) - Affected versions: All versions >= V2.0 < V2.2.28 - Remediation: Update to V2.2.28 or later version See recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109817067/ * SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0) - Affected versions: All versions >= V2.0 < V2.2.28 - Remediation: Update to V2.2.28 or later version See recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109817067/ * SIPLUS NET CP 1242-7 V2 (6AG1242-7KX31-7XE0) - Affected versions: All versions >= V3.1.39 < V3.3 - Remediation: Update to V3.3 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109799604/ * SIPLUS S7-1200 CP 1243-1 (6AG1243-1BX30-2AX0) - Affected versions: All versions >= V3.1.39 and < V3.3.46 - Remediation: Update to V3.3.46 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/us/en/view/109812218/ * SIPLUS S7-1200 CP 1243-1 RAIL (6AG2243-1BX30-1XE0) - Affected versions: All versions >= V3.1.39 and < V3.3.46 - Remediation: Update to V3.3.46 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/us/en/view/109812218/ * SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) - Affected versions: All versions < V2.2 Update 1 - Remediation: Update to V2.2 Update 1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/de/en/view/109803672/ * TIM 1531 IRC (6GK7543-1MX00-0XE0) - Affected versions: All versions < V2.2 Update 1 - Remediation: Update to V2.2 Update 1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/de/en/view/109803672/ WORKAROUNDS AND MITIGATIONS =========================== Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk: * Use name servers inside corporate environments * Restrict access of CLI and web-based management interfaces for the affected devices to a dedicated layer 2 segment/VLAN and/or controlled by firewall policies at layer 3 where possible * Disable outgoing ICMP packets by using "service ACLs" to implement blocking rules 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 =================== RUGGEDCOM RM1224 is a 4G ROUTER for wireless IP-communication from Ethernet based devices via LTE(4G)- mobile radio. SCALANCE M-800, MUM-800 and S615 as well as the RUGGEDCOM RM1224 are industrial routers. SCALANCE SC-600 devices (SC622-2C, SC626-2C, 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. SCALANCE W1750D is an Access Point that supports IEEE 802.11ac standards for high-performance WLAN, and is equipped with two dual-band radios, which can provide access and monitor the network simultaneously. SIMATIC Cloud Connect 7 is an IoT Gateway to connect programmable logic controllers to cloud services and enables the connection of field devices with OPC UA server Interface as OPC UA clients. SIMATIC CP 1242-7 and CP 1243-7 LTE communications processors connect SIMATIC S7-1200 controllers to Wide Area Networks (WAN). They provide integrated security functions such as firewall, Virtual Private Networks (VPN) and support of other protocols with data encryption. SIMATIC CP 1243-8 IRC communications processors connect SIMATIC S7-1200 controllers via the SINAUT ST7 telecontrol protocol to a control center or master ST7 stations. The SIMATIC CP 1543-1 and SIMATIC CP 1545-1 communication processor connects the S7-1500 controller to Ethernet networks. It provides integrated security functions such as firewall, Virtual Private Networks (VPN) and support of other protocols with data encryption. The communication processor protects S7-1500 stations against unauthorized access, as well as integrity and confidentiality of transmitted data. SIMATIC CP 1243-1 communications processors connect S7-1200 controllers to Ethernet networks. They provide integrated security functions such as firewall, Virtual Private Networks (VPN) and support of other protocols with data encryption. The SIMATIC CP 1543SP-1, CP 1542SP-1 and CP 1542SP-1 IRC communication processors connect the S7-1500 controller to Ethernet networks. It provides integrated security functions such as firewall, Virtual Private Networks (VPN) and support of other protocols with data encryption. SIMATIC MV500 products are stationary optical readers, used to reliably capture printed, lasered, drilled, punched and dotpeen codes on a variety of different surfaces. SINEMA Remote Connect is a management platform for remote networks that enables the simple management of tunnel connections (VPN) between headquarters, service technicians, and installed machines or plants. It provides both the Remote Connect Server, which is the server application, and the Remote Connect Client, which is an OpenVPN client for optimal connection to SINEMA Remote Connect Server. SIPLUS extreme products are designed for reliable operation under extreme conditions and are based on SIMATIC, LOGO!, SITOP, SINAMICS, SIMOTION, SCALANCE or other devices. SIPLUS devices use the same firmware as the product they are based on. TIM 1531 IRC is a communication module for SIMATIC S7-1500, S7-400, S7-300 with SINAUT ST7, DNP3 and IEC 60870-5-101/104 with three RJ45 interfaces for communication via IP-based networks (WAN / LAN) and a RS 232/RS 485 interface for communication via classic WAN networks. 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/. * Vulnerability CVE-2020-25705 A flaw in ICMP packets in the Linux kernel was found to allow to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well. Kernel versions before 5.10 may be vulnerable to this issue. CVSS v3.1 Base Score: 7.4 CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C CWE: CWE-330: Use of Insufficiently Random Values 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 (2021-05-11): Publication Date V1.1 (2021-06-08): Added solution for TIM 1531 IRC V1.2 (2021-07-13): Added solution for SIMATIC NET CP 1243-7 LTE EU and SIMATIC NET CP 1243-7 LTE US V1.3 (2021-08-10): Added solution for SIMATIC NET CP 1543-1 V1.4 (2021-09-14): Errata: Removed solution for TIM 1531 IRC as V2.2 did not fix the issue V1.5 (2021-10-12): Corrected wrong product name SIMATIC CP 1243-7 to SIMATIC CP 1242-7 GPRS V2, updated solution for SIMATIC CP 1243-7 LTE, added solution for SIMATIC CP 1242-7 GPRS V2 and SCALANCE W1750D V1.6 (2021-11-09): Added solution for SIMATIC Cloud Connect 7 and TIM 1531 IRC, split TIM 1531 IRC into individual products, split SIMATIC Cloud Connect 7 into individual products V1.7 (2021-12-14): Added solution for the SIMATIC MV500 family products V1.8 (2022-06-14): Added fix for SIMATIC CP 1545-1 V1.9 (2022-08-09): Added fix for SIMATIC CP 1243-1 and CP 1243-8 IRC V2.0 (2023-03-14): Added fix for SIMATIC CP 1542SP-1, SIMATIC CP 1542SP-1 IRC, and SIMATIC CP 1543SP-1 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://www.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. 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