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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0997 Advisory (ICSA-18-088-03) Siemens SIMATIC PCS 7, SIMATIC WinCC, SIMATIC WinCC Runtime Professional, and SIMATIC NET PC Software 4 April 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SIMATIC Publisher: ICS-CERT Operating System: Windows Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-4832 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-088-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-088-03) Siemens SIMATIC PCS 7, SIMATIC WinCC, SIMATIC WinCC Runtime Professional, and SIMATIC NET PC Software Original release date: March 29, 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 7.5 ATTENTION: Exploitable remotely/low skill level to exploit. Vendor: Siemens Equipment: SIMATIC PCS 7, SIMATIC WinCC, SIMATIC WinCC Runtime Professional, and SIMATIC NET PC Software Vulnerability: Improper Input Validation AFFECTED PRODUCTS Siemens reports that the vulnerability affects the following SIMATIC products: OpenPCS 7 V7.1 and earlier, OpenPCS 7 V8.0: All versions, OpenPCS 7 V8.1: All versions, OpenPCS 7 V8.2: All versions, OpenPCS 7 V9.0: All versions prior to V9.0 Upd1, SIMATIC BATCH V7.1 and earlier, SIMATIC BATCH V8.0: All versions, SIMATIC BATCH V8.1: All versions, SIMATIC BATCH V8.2: All versions, SIMATIC BATCH V9.0: All versions prior to V9.0 SP1, SIMATIC NET PC-Software: All versions, SIMATIC PCS 7 V7.1 and earlier, SIMATIC PCS 7 V8.0: All versions, SIMATIC PCS 7 V8.1: All versions, SIMATIC PCS 7 V8.2: All versions, SIMATIC PCS 7 V9.0: All versions prior to V9.0 SP1, SIMATIC Route Control V7.1 and earlier, SIMATIC Route Control V8.0: All versions, SIMATIC Route Control V8.1: All versions, SIMATIC Route Control V8.2: All versions, SIMATIC Route Control V9.0: All versions prior to V9.0 Upd1, SIMATIC WinCC Runtime Professional: All versions prior to V14 SP1 Upd5, SIMATIC WinCC 7.2 and earlier, SIMATIC WinCC 7.3: All versions prior to WinCC 7.3 Upd16, and SIMATIC WinCC 7.4: All versions prior to V7.4 SP1 Upd4 IMPACT Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition on the remote and local communication functionality of the affected products. A system reboot is required to recover. MITIGATION Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk: Upgrade to a newer PCS 7 version. Ensure that SIMATIC WinCC, SIMATIC WinCC Runtime Professional and SIMATIC PCS 7 stations communicate via encrypted channels (i.e., activate feature Encrypted Communication in SIMATIC WinCC V7.3 or newer and SIMATIC PCS 7 V8.1 or newer). Enabling Encrypted Communication completely mitigates the vulnerability. Apply cell protection concept. Use VPN for protecting network communication between cells. Apply Defense-in-Depth. Siemens has released updates for several affected products and recommends users update to the new version. Siemens is preparing further updates and recommends specific countermeasures until patches are available: SIMATIC PCS 7 V9.0: Install V9.0 SP1: Contact local support. SIMATIC WinCC Runtime Professional: Update to V14 SP1 Upd5: https://support.industry.siemens.com/cs/ww/en/view/109747394 (link is external) SIMATIC WinCC V7.3: Update to WinCC 7.3 Upd16: https://support.industry.siemens.com/cs/ww/en/view/109756123 (link is external) SIMATIC WinCC V7.4: Update to V7.4 SP1 Upd4 https://support.industry.siemens.com/cs/ww/en/view/109753031 (link is external) As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to run the devices in a protected IT environment, Siemens particularly recommends that users configure the environment according to Siemens Operational Guidelines for Industrial Security (link is external) and 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 advisory SSA-348629 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. VULNERABILITY OVERVIEW IMPROPER INPUT VALIDATION CWE-20 Specially crafted messages sent to the RPC service of the affected products could cause a denial-of-service condition on the remote and local communication functionality of the affected products. A reboot of the system is required to recover the remote and local communication functionality. CVE-2018-4832 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). RESEARCHER Vladimir Dashchenko from Kaspersky Lab and independent researcher cdev1 reported this vulnerability to Siemens. BACKGROUND Critical Infrastructure Sectors: Chemical, Energy, Food and Agriculture, Water and Wastewater Systems. Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWsRKUYx+lLeg9Ub1AQgiPw/9HTPtNfMfVyY7DpIfjcrDajNXg3hd0FnQ 4n3GpCCPM2/JiC4IihGYZnlZ2vNN1Y4eEMPEy6Tj6pHUSMIKdXZ5K9V915B4XUcD hlLopuyaA8lui/RaxuY/e+VVp+XnpZW743i/WbSi9LK6aKV4cx7Wq6GJUynlBGSB ZGPdkFX0lMltWTrbnsmEtqwotDhFSmZpDQcknLN4RNW0y0bfswJMnneeCgQVkfWU Stvk7CAc3ggb43kJ14DrLWq/49cNYO20jq5AfqopL8tdjKt9DrqUMwPdexorGLKi h3JFpaMDmNRLpyoZZQ6YuC+THblOJLD0pMAFEuASO9hYQbr21qkvXkNXOEGTO656 31ENAVzhXwAgW1XvB4VGhsuYMrqNuNC4W887pfsjOQBONOi6gPFQPD8gzmVGft03 zUx01jSsqgmrbCr0KvnPryMPQmX5DrWtdPZtFJ1ej6n/gynPDjY3owoM3TIjqIgu Si4z1NZZ3DR1xTq2u/F5tE5MpyhwWTTZtm0vhVk3kjcdF8IvF/GwniGzhBCHUhdj JWeRQsr/fpHYLNBB68RW1fNbAIlaH4YYZQ7pcxuE2SW0jpjzGXabuH/5FzUtdZM7 neqFywcDEhZUpB0IjV84Dmxnkl66ueoOAvwQ/SNtxxXh7cCLEXum9lgWtktgNw4q hvQS65E1yGo= =6yV+ -----END PGP SIGNATURE-----