10 April 2019
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.1205 Siemens Industrial Products with OPC UA 10 April 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SIMATIC Siemens SINEC-NMS Siemens SINEMA Siemens SINEMURIK Industrial Control Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-6575 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-19-099-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-19-099-03) Siemens Industrial Products with OPC UA Original release date: April 09, 2019 Legal Notice All information products included in http://ics-cert.us-cert.gov are provided"as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see http://www.us-cert.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 7.5 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Siemens o Equipment: SIMATIC, SINEC-NMS, SINEMA, SINEMURIK Industrial Control Products with OPC UA o Vulnerability: Uncaught Exception 2. RISK EVALUATION Successful exploitation of this vulnerability could cause a denial-of-service condition on the affected service or device. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following Siemens industrial products are affected: o SIMATIC CP443-1 OPC UA, all versions o SIMATIC ET200 Open Controller CPU 1515SP PC2, all versions o SIMATIC IPC DiagMonitor, all versions o SIMATIC NET PC Software, all versions o SIMATIC RF188C, all versions o SIMATIC RF600R, all versions o SIMATIC S7-1500 CPU Family, v2.5 and prior o SIMATIC S7-1500 Software Controller, v2.5 and prior o SIMATIC WinCC OA, all versions prior to v3.15-P018 o SIMATIC WinCC Runtime Advanced, all versions o SIMATIC WinCC Runtime Comfort, all versions o SIMATIC WinCC Runtime HSP Comfort, all versions o SIMATIC WinCC Runtime Mobile, all versions o SINEC-NMS, all versions o SINEMA Server, all versions o SINUMERIK OPC UA Server, all versions prior to v2.1 o TeleControl Server Basic, all versions 3.2 VULNERABILITY OVERVIEW 3.2.1 UNCAUGHT EXCEPTION CWE-248 Specially crafted network packets sent to affected devices on Port 4840/TCP could allow an unauthenticated remote attacker to cause a denial-of-service condition in the OPC communication or crash the device. An attacker with network access to the affected systems could exploit the vulnerability. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the OPC communication. CVE-2019-6575 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/ I:N/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Siemens ProductCERT reported this vulnerability to NCCIC. 4. MITIGATIONS Siemens currently has updates for the following products: o SIMATIC WinCC OA: Update to v3.15-P018 https://www.winccoa.com/news/detail/new-patch-p018-available-for-315.html (logon required) o SINUMERIK OPC UA Server: Update to v2.1 or newer https://support.industry.siemens.com/cs/ww/en/view/109746207 For the balance of the listed products, Siemens is preparing further updates and recommends users apply the following specific workarounds and mitigations to reduce risk until patches are available: o Deactivate the OPC UA Service if supported by the product. o Apply cell protection concept. o Use VPN for protecting network communication between cells. o Apply defense in depth. Siemens recommends users configure their environment according to Siemens' operational guidelines for Industrial Security ( Download ) and follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity For more information on the vulnerability and more detailed mitigation instructions, please see Siemens security advisory SSA-307392 at the following location: http://www.siemens.com/cert/advisories NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet . o Locate control system networks and remote devices behind firewalls, and isolate them from the business network. o When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies . Additional mitigation guidance and recommended practices are publicly available on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to email@example.com and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. 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