-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 # SSA-321292: Denial of Service in the OPC Foundation Local Discovery Server (LDS) in Industrial Products Publication Date: 2022-05-10 Last Update: 2023-04-11 Current Version: 1.5 CVSS v3.1 Base Score: 7.5 SUMMARY ======= A vulnerability has been identified in the OPC Foundation Local Discovery Server (LDS) [0] of several industrial products. The vulnerability could cause a denial of service condition on the service or the device. Siemens has released updates for several affected products and recommends to update to the latest versions. Siemens is preparing further updates and recommends specific countermeasures for products where updates are not, or not yet available. [0] https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundatio n%20Security%20Bulletin%20CVE-2021-40142.pdf AFFECTED PRODUCTS AND SOLUTION ============================== * OpenPCS 7 - Affected versions: All versions - Remediation: Currently no fix is available See recommendations from section "Workarounds and Mitigations" * SIMATIC NET PC Software V14 - Affected versions: All versions < V14 SP1 Update 14 - Remediation: Update to V14 SP1 Update 14 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109807351/ * SIMATIC NET PC Software V15 - Affected versions: All versions - Remediation: Currently no fix is planned See recommendations from section "Workarounds and Mitigations" * SIMATIC NET PC Software V16 - Affected versions: All versions < V16 Update 6 - Remediation: Update to V16 Update 6 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109811815/ * SIMATIC NET PC Software V17 - Affected versions: All versions < V17 SP1 - Remediation: Update to V17 SP1 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109808270/ * SIMATIC Process Historian OPC UA Server - Affected versions: All versions < V2020 SP1 - Remediation: Update to V2020 SP1 or later version For PCS neo: Update to PCS neo V3.1 SP1 ( https://support.industry.siemens.com/cs/ww/de/view/109807752/) For PCS 7: Update to PCS 7 V9.1 SP1 ( https://support.industry.siemens.com/cs/ww/en/view/109805073/) For WinCC: contact local support See further recommendations from section "Workarounds and Mitigations" * SIMATIC WinCC - Affected versions: All versions < V8.0 - Remediation: Update to V8.0 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109816599/ * SIMATIC WinCC Runtime Professional - Affected versions: All versions < V18 - Remediation: Update to V18 or later version See further recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109813587/ * SIMATIC WinCC Unified PC Runtime - Affected versions: All versions < V18 SR 1 - Remediation: Update to V18 SR 1 or later version See recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109807123/ * TeleControl Server Basic V3 - Affected versions: All versions < V3.1.1 - Remediation: Update to V3.1.1 or later version See recommendations from section "Workarounds and Mitigations" - Download: https://support.industry.siemens.com/cs/ww/en/view/109812231/ WORKAROUNDS AND MITIGATIONS =========================== Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk: * Deactivate the OPC LDS Service if supported by the product use case. The LDS service is not activated in the default configuration * Use VPN for protecting network communication between cells 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 =================== OpenPCS 7 is an OPC-compliant connection to business planning and operations control systems. OpenPCS 7 provides a direct connection to MES and MOM systems. SIMATIC Process Historian is the long term archive system for SIMATIC PCS 7, SIMATIC WinCC and SIMATIC PCS neo. It stores process values, alarms and batch data of production plants in its database and offers historical process data to reporting and visualization applications. SIMATIC NET PC software is a software product that is sold separately and implements the communications product from SIMATIC NET. SIMATIC WinCC is a supervisory control and data acquisition (SCADA) system. SIMATIC WinCC Runtime Professional is a visualization runtime platform used for operator control and monitoring of machines and plants. SIMATIC WinCC Unified PC Runtime is the new visualization runtime platform used for operator control and monitoring of machines and plants. TeleControl Server Basic allows remote monitoring and control of plants. 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-2021-40142 In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service condition by sending carefully crafted messages that lead to access of a memory location after the end of a buffer. CVSS v3.1 Base Score: 7.5 CVSS 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-119: Improper Restriction of Operations within the Bounds of a Memory Buffer 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 (2022-05-10): Publication Date V1.1 (2022-07-12): Added fix for SIMATIC NET PC Software V16 V1.2 (2022-08-09): Added fix for TeleControl Server Basic V1.3 (2022-12-13): Added fix for SIMATIC WinCC Runtime Professional and SIMATIC WinCC Unified PC Runtime V1.4 (2023-03-14): Added OpenPCS 7 to the list of affected products V1.5 (2023-04-11): Added fix for SIMATIC WinCC 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. Copyright: Siemens 2023 -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEHyx/myPwjH9jB9tDlm7gTEmyujQFAmQ0owAACgkQlm7gTEmy ujTgTxAAwG2fx+zzEdKINO9qYGORMbfv8uNB/x3QyjL4h6qjasp2BfaA/wN7KwQP r80eBpHRNCksod4foule4ZwoW/T85247QVeEeVBsY0f6G/UkFkcL7okNm+154HLC mrgK1ulQaawMmsxTU9vCtITILXLTcvA3jhewW0JUACoJt5QPVG2jcZThGPu7ulST t3jTK6vjk8CRDCIr83S1U66euVdrjhrZaCLfT6tn2FCjtiXRQRVUNMpBuevJBkMS FhyOxoTQ+ZQa6yKjsvwRuvrWgeenCzAjQkYvOW74bsQnCCLX2ujouFmZXwvWEBCc 7dXDQfwyP0LSs3zz1tzgh1G2Nv23YqUjw14DrvriXoq4g8V/pmPwHFOipRGgKsJV cirvflkZYLYMlY5CTjN+db82L/z4xR2RlwCAqjMWPq8qfGUOHhHa+BvVBTUK40/P t0Qx5IGIWsYVhqmbWGOGXiBgi1y1V+keujertZF5m+NCUGQltM2t47aPHypetej2 dUh2DthfK7uQS65w6B2lDJC0qR0E4q7y6g5fuFu4lOvIfOBeRqWrLhz+jT5nppdX 4bLPW2cw9s7nu1olWZO3fD6MjuaX9JFtSscRmtSWOmCLmdOPbRDM5aBvEGCRXI1x 1Q/94ZP6Mh6pzUqFDaUexFTZ4nJsACeDdBiF68SvbOMWnCy/35s= =zkYj -----END PGP SIGNATURE-----