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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1465 Siemens SIMATIC S7-300 and Siemens SIMATIC WinCC Vulnerabilities 10 June 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SIMATIC S7-300 Siemens SIMATIC WinCC Publisher: ICS-CERT Operating System: Network Appliance Windows Impact/Access: Access Privileged Data -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2016-3949 CVE-2015-1358 Original Bulletin: http://ics-cert.us-cert.gov/advisories/ICSA-16-161-01 http://ics-cert.us-cert.gov/advisories/ICSA-16-161-02 Comment: This bulletin contains two (2) ICS-CERT security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-161-01) Siemens SIMATIC S7-300 Denial of-Service Vulnerability Original release date: June 09, 2016 Share 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 the SIMANTIC S7-300 CPU family. The vulnerability was reported directly to Siemens by Mate J. Csorba of DNV GL, Marine Cybernetics Services, and Amund Sole of Norwegian University of Science and Technology. Siemens has produced a firmware update to mitigate this vulnerability. This vulnerability could be exploited remotely. AFFECTED PRODUCTS Siemens reports that the vulnerability affects the following products: SIMATIC S7-300 CPUs with Profinet support: All versions prior to V3.2.12, and SIMATIC S7-300 CPUs without Profinet support: All versions prior to V3.3.12. IMPACT An exploit of this vulnerability could cause the affected device to go into defect mode, requiring a cold restart to recover the system. 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, SIMATIC S7-300 CPU, has been designed for process control in industrial environments. This product is deployed across several sectors including Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems. Siemens estimates that this product is used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW IMPROPER CONTROL OF A RESOURCE THROUGH ITS LIFETIME [a] Specially crafted packets sent to Port 102/TCP (ISO-TSAP) or via Profibus could cause the affected device to go into defect mode. A cold restart is required to recover the system. CVE-2016-3949 [b] 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). [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 has released SIMATIC S7-300 firmware Versions V3.2.12 and V3.3.12, which fix the vulnerability, and recommends users update to the latest version. Users can find this firmware at the following location: https://support.industry.siemens.com/cs/ww/en/ps/13752 (link is external) For more information on this vulnerability and detailed instructions, please see Siemens Security Advisory SSA-818183 at the following location: http://www.siemens.com/cert/advisories (link is external) As a general security measure Siemens strongly recommends keeping firmware up-to-date and to protect network access to the S7-300 CPUs 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) 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-664: Improper Control of a Resource Through its Lifetime, http://cwe.mitre.org/data/definitions/664.html, web site last accessed June 09, 2016. b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-3949, 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 June 09, 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-16-161-02) Siemens SIMATIC WinCC Flexible Weakly Protected Credentials Vulnerability Original release date: June 09, 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 weakly protected credentials vulnerability in SIMATIC WinCC flexible. Gleb Gritsai and Roman Ilin from Positive Technologies reported this issue directly to Siemens. Siemens has produced an update to mitigate this vulnerability. This vulnerability could be exploited remotely. AFFECTED PRODUCTS Siemens reports that the vulnerability affects the following product: SIMATIC WinCC flexible: All versions prior to SP3 Up7. IMPACT Attackers capturing network traffic of the remote management module could possibly reconstruct user credentials. 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. SIMATIC WinCC flexible, is a software package used for visualization and machine or small system operations. This product runs on standard PCs or on Siemens panel PCs. This product is 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 INSUFFICIENTLY PROTECTED CREDENTIALS [a] The remote management module of SIMATIC WinCC flexible panels and SIMATIC WinCC flexible runtime transmits weakly protected credentials over the network. Attackers capturing network traffic of the remote management module could possibly reconstruct the credentials. CVE-2015-1358 [b] has been assigned to this vulnerability. A CVSS v3 base score of 3.7 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N). [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 high skill would be able to exploit this vulnerability. MITIGATION Siemens provides Update 7 for SIMATIC WinCC flexible 2008 SP3, which fixes the vulnerability, and recommends users to update to the new version. Update 7 can be found at the following location on the Siemens web site: https://support.industry.siemens.com/cs/ww/en/view/58860033 (link is external) For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-526760 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 devices running SIMATIC WinCC flexible with appropriate mechanisms. Siemens advises configuring the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment. 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-522: Insufficiently Protected Credentials, http://cwe.mitre.org/data/definitions/522.html, web site last accessed June 09, 2016. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1358, web site last accessed June 09, 2016. c. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S... , web site last accessed June 09, 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. 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: 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBV1pIQ4x+lLeg9Ub1AQhNtw/7BX2tjG6lvQS5Xvpf2QQiCsIe7wCIqAYE LAMkJ+cau8tSsk9N8IQ3AiM8UbdaA6xrYhd18Uf5mTDS9KBhjOkUg2lFiCtdRu3O dQeL88KgB6stdzc9/c9TZF0s8xgxMLuZNpwPLP/JYWVuHn7k2sq0F3t1jm8yZoY6 gDArZBMQIOTPtfa1nsVWPp65oNK7Ht6wnYdMzE72NiMOv8uEh+NkRZwgIbzt5r54 SX/Iz7a5OfHL14BBYHr9DEJLFS3hdq5Tu/xqLLpWGaTJ8umvNvuTWEEUZHF9inbe c12rJ5cmgZ8V8k4zJSjRfoarupRUX0iPBh6sIw8/izTsTMKI7BjNHDJMNk0xIkVQ dHGh5rCy1Ax7fXsqsu8Y15RpiqX9mqR4aGvuqXpbnyMdEFZiIRViovC8iN8YDMmQ JC7OrsvN6jpJqxd7262UbYoYsuE4uXMlV7hrAGegNi/H7F/YvaG+hox517afJz8L Sou5+esBxWlJBrGMuZ67vihZPlKhM0qMS2UiJIqWa7uIw0hKkQ8ksbkUwrhEFDzF 9rew7han4W/Wr16Xz+lgoFullF3qyhJVG5jWnhs1YGTYBRNdQqB7O57WZNSaP5tr fW3OT+jPaRGJTqo8bzJSM1xvMmYlz+lWv4AU92ScaISp3EevEfk9pnQeK5TWQz38 aB+VwF+gcZY= =BTO3 -----END PGP SIGNATURE-----