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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1822 Multiple vulnerabilities have been identified in Siemens SIMATIC products 27 July 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SIMATIC NET PC-Software Siemens SIMATIC WinCC products Siemens SIMATIC PCS 7 Publisher: ICS-CERT Operating System: Network Appliance Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2016-5874 CVE-2016-5744 CVE-2016-5743 Original Bulletin: http://ics-cert.us-cert.gov/advisories/ICSA-16-208-01 http://ics-cert.us-cert.gov/advisories/ICSA-16-208-02 Comment: This bulletin contains two (2) ICS-CERT security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-208-01) Siemens SIMATIC WinCC, PCS 7, and WinCC Runtime Professional Vulnerabilities Original release date: July 26, 2016 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/. OVERVIEW Siemens has identified two vulnerabilities in SIMATIC WinCC, PCS 7, and WinCC Runtime Professional. Sergey Temnikov and Vladimir Dashchenko from Kaspersky Lab reported these issues directly to Siemens. Siemens has produced updates to mitigate these vulnerabilities. These vulnerabilities could be exploited remotely. AFFECTED PRODUCTS Siemens reports that the vulnerabilities affect the following products: SIMATIC WinCC: V7.0 SP 2 and earlier versions, V7.0 SP 3: All versions, V7.2: All versions, V7.3: All versions prior to 7.3 Update 10, and V7.4: All versions prior to 7.4 Update 1 SIMATIC PCS 7 (WinCC, Batch, Route Control, OPEN PCS 7): V7.1 SP4 and earlier versions, V8.0: All versions, V8.1: All versions, and V8.2: All versions SIMATIC WinCC Runtime Professional: All versions prior to V13 SP 1 Update 9 IMPACT Attackers exploiting these vulnerabilities could possibly extract arbitrary files or remotely execute arbitrary code. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation. BACKGROUND Siemens is a multinational company headquartered in Munich, Germany. The affected products are: SIMATIC WinCC, a supervisory control and data acquisition (SCADA) system; and PCS7, a distributed control system (DCS) integrating SIMATIC WinCC. These products are deployed across several sectors including Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems. Siemens estimates that these products are used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW IMPROPER INPUT VALIDATION [a] Specially crafted packets sent to SIMATIC WinCC or WinCC Runtime Professional could allow remote code execution for unauthenticated users. CVE-2016-5743 [b] has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). [c] IMPROPER INPUT VALIDATION [d] Specially crafted packets sent to SIMATIC WinCC could allow unauthenticated users to extract arbitrary files from the WinCC station. This vulnerability only affects WinCC V7.0 and WinCC V7.2. CVE-2016-5744 [e] has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). [f] VULNERABILITY DETAILS EXPLOITABILITY These vulnerabilities could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target these vulnerabilities. DIFFICULTY An attacker with low skill would be able to exploit these vulnerabilities. MITIGATION Siemens has produced updates for the following products and strongly encourages users to upgrade to the new versions as soon as possible: WinCC V7.3: Update to WinCC V7.3 Update 10 https://support.industry.siemens.com/cs/ww/en/view/109738470 (link is external) WinCC V7.4: Update to WinCC V7.4 Update 1 https://support.industry.siemens.com/cs/ww/de/view/109738653 (link is external) PCS 7 V8.1 SP1: WinCC: Update to WinCC V7.3 Update 10 https://support.industry.siemens.com/cs/ww/en/view/109738470 (link is external) SIMATIC BATCH: Update to SIMATIC BATCH V8.1 SP1 Upd. 9 Contact Customer Support: https://support.industry.siemens.com/cs/de/en/ (link is external) OpenPCS 7: Update to OpenPCS 7 V8.1 Upd. 3 Contact Customer Support: https://support.industry.siemens.com/cs/de/en/ (link is external) PCS 7 V8.2: WinCC: Update to WinCC V7.4 Update 1 (link is external) https://support.industry.siemens.com/cs/ww/de/view/109738653 (link is external) OpenPCS 7: Update to OpenPCS7 V8.2 Update 1 Contact Customer Support: https://support.industry.siemens.com/cs/de/en/ (link is external) WinCC Runtime Professional V13: Update to WinCC Runtime Professional V13 SP1 Update 9: https://support.industry.siemens.com/cs/ww/en/view/109311724 (link is external) Until updates can be applied, Siemens recommends the following steps to mitigate the risk: Always run WinCC, WinCC Runtime Professional, and PCS 7 stations within a trusted network. Ensure that WinCC, WinCC Runtime Professional, and PCS 7 stations communicate via encrypted channels only (e.g., activate feature Encrypted Communications in WinCC V7.3 and PCS 7 V8.1 SP1, or establish a VPN tunnel). Restrict access to the WinCC, WinCC Runtime Professional and PCS 7 stations to trusted entities. Apply up-to-date application whitelisting software and virus scanners. For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-378531 at the following location: http://www.siemens.com/cert/en/cert-security-advisories.htm (link is external) As a general security measure Siemens strongly recommends protecting network access to the WinCC and PCS 7 stations with appropriate mechanisms. Siemens advises configuring the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment. https://www.siemens.com/cert/operational-guidelines-industrial-security (link is external) ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page at: http://ics-cert.us-cert.gov/content/recommended-practices. 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 ICSCERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site (http://ics-cert.us-cert.gov/). Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents. a. CWE-20: Improper Input Validation, http://cwe.mitre.org/data/definitions/20.html, web site last accessed July 26, 2016. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5743, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. c. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed July 26, 2016. d. CWE-20: Improper Input Validation, http://cwe.mitre.org/data/definitions/20.html, web site last accessed July 26, 2016. e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5744, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. f. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed July 26, 2016. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov (link sends e-mail) Toll Free: 1-877-776-7585 International Callers: (208) 526-0900 For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov ICS-CERT continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product. - --- Advisory (ICSA-16-208-02) Siemens SIMATIC NET PC-Software Denial-of-Service Vulnerability Original release date: July 26, 2016 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/. OVERVIEW Siemens has identified a denial-of-service vulnerability in SIMATIC NET PC-Software. Vladimir Dashchenko and Sergey Temnikov from Kaspersky Labs reported this issue directly to Siemens. Siemens has produced a new version to mitigate this vulnerability. This vulnerability could be exploited remotely. AFFECTED PRODUCTS Siemens reports that the vulnerability affects the following SIMATIC products: SIMATIC NET PC-Software: All versions prior to V13 SP2 IMPACT A successful exploit of this vulnerability could cause a denial-of-service condition that would require a manual restart to recover. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. BACKGROUND Siemens is a multinational company headquartered in Munich, Germany. The affected product, the Siemens SIMATIC NET PC-Software, is designed for communication between controllers (PLCs) and PC-based solutions (HMIs). According to Siemens, the SIMATIC NET PC-Software is deployed across several sectors including Chemical, Critical Manufacturing, and Food and Agriculture. Siemens estimates that this product is used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW RESOURCE EXHAUSTION [a] Specially crafted packets sent to several ports (Port 55101/TCP through Port 55105/TCP, Port 4845/TCP, and Port 4847/TCP through Port 4850/TCP) could cause a denial-of-service of the OPC-Unified Architecture (UA) service. A manual restart of the service is required to recover the system. CVE-2016-5874 [b] has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L[A1] ). [c] VULNERABILITY DETAILS EXPLOITABILITY This vulnerability could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target this vulnerability. DIFFICULTY An attacker with a low skill would be able to exploit this vulnerability. MITIGATION Siemens provides SIMATIC NET PC-Software V13 SP2, which fixes the vulnerability, and recommends users upgrade to the new version. SIMATIC NET PC-Software V13 SP2 can be obtained by contacting your local Siemens representative or customer support. If OPC-UA is not required, Siemens recommends deactivating these in the communication settings according to the information in the respective product manual. As a general security measure, Siemens strongly recommends protecting network access to SIMATIC NET PC-Software services with appropriate mechanisms. It is advised to configure the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment. https://www.siemens.com/cert/operational-guidelines-industrial-security (link is external) For more information on this vulnerability and detailed instructions, please see Siemens Security Advisory SSA-453276 at the following location: http://www.siemens.com/cert/advisories (link is external) ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: Monitor traffic to Port 55101/TCP through Port 55105/TCP, Port 4845/TCP, and Port 4847/TCP through Port 4850/TCP on the affected devices. Restrict access if not needed. 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. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page at: http://ics-cert.us-cert.gov/content/recommended-practices. 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 ICSCERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site (http://ics-cert.us-cert.gov/). Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents. a. CWE-400: Uncontrolled Resource Consumption ('Resource Exhaustion'), http://cwe.mitre.org/data/definitions/400.html, web site last accessed July 26, 2016. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5874, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. c. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed July 26, 2016. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov (link sends e-mail) Toll Free: 1-877-776-7585 International Callers: (208) 526-0900 For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov ICS-CERT continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product. - --------------------------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. 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If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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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