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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0805 Siemens SIMATIC, SINUMERIK, and PROFINET IO 21 March 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SIMATIC, SINUMERIK, and PROFINET IO Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-4843 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-079-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-079-02) Siemens SIMATIC, SINUMERIK, and PROFINET IO Original release date: March 20, 2018 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/. CVSS v3 5.3 ATTENTION: Exploitable from an adjacent network Vendor: Siemens Equipment: SIMATIC, SINUMERIK, and PROFINET IO Vulnerability: Improper Input Validation AFFECTED PRODUCTS Siemens reports that the vulnerability affects the following products: SIMATIC CP 343-1 Advanced: All versions, SIMATIC CP 343-1 Standard: All versions, SIMATIC CP 443-1 Advanced: All versions, SIMATIC CP 443-1 Standard: All versions, SIMATIC S7-1500 Software Controller incl. F: All versions prior to V1.7.0, SIMATIC S7-1500 incl. F: All versions prior to V1.7.0, SIMATIC S7-300 incl. F and T: All versions, SIMATIC S7-400 H V6: All versions, SIMATIC S7-400 PN/DP V6 Incl. F: All versions prior to V6.0.7, SIMATIC S7-400 PN/DP V7 Incl. F: All versions, SIMATIC S7-410: All versions prior to V8.1, SIMATIC WinAC RTX 2010 incl. F: All versions, SINUMERIK 828D: All versions, SINUMERIK 840D sl: All versions, and Softnet PROFINET IO for PC-based Windows systems: All versions. IMPACT Successful exploitation of this vulnerability could result in a denial-of-service condition requiring a manual restart to recover the system. MITIGATION Siemens has provided the following updates for mitigations: SIMATIC S7-1500 Software Controller incl. F: Update to V1.8.5 or newer, which can be located here: https://support.industry.siemens.com/cs/ww/en/view/109478528 (link is external) SIMATIC S7-1500 incl. F: Update to V1.8.5 or newer, which can be located here: https://support.industry.siemens.com/cs/ww/en/view/109478459 (link is external) SIMATIC S7-400 PN/DP V6 Incl. F: Update to V6.0.7, which can be located here: https://support.industry.siemens.com/cs/ww/en/view/109474874 (link is external) SIMATIC S7-410: Update to V8.1, which can be located here: https://support.industry.siemens.com/cs/ww/en/view/109476571 (link is external) For all other affected products, Siemens has identified the following specific workarounds and mitigations that users can apply to reduce the risk, refer to: Apply cell protection concept. Use VPN for protecting network communication between cells. Apply defense-in-depth. Additional information is available at: https://www.siemens.com/cert/operational-guidelines-industrial-security (link is external): As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to run the devices in a protected IT environment, Siemens particularly recommends to configure the environment according to Siemens’ operational guidelines for 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 (link is external) For more information on this vulnerability and associated software updates, please see Siemens security notification SSA-592007 on their website: https://www.siemens.com/cert/advisories (link is external) NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. Locate control system networks and remote devices behind firewalls, and isolate them from the business network. 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 in the NCCIC Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website. 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. High skill level is needed to exploit. VULNERABILITY OVERVIEW IMPROPER INPUT VALIDATION CWE-20 Responding to a PROFINET DCP request with a specially crafted PROFINET DCP packet could result in a denial-of-service condition of the requesting system. This vulnerability could be exploited if the attacker is located on the same Ethernet segment (OSI Layer 2) as the targeted device. CVE-2018-4843 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H). RESEARCHER Siemens ProductCERT reported this vulnerability to NCCIC. BACKGROUND Critical Infrastructure Sectors: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems. Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Contact Information For any questions related to this report, please contact the NCCIC at: Email: NCCICCUSTOMERSERVICE@hq.dhs.gov (link sends e-mail) Toll Free: 1-888-282-0870 For industrial control systems cybersecurity information: http://ics-cert.us-cert.gov or incident reporting: https://ics-cert.us-cert.gov/Report-Incident? - --------------------------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 auscert@auscert.org.au 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. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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